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Coal gas
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Coal gas
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Coal gas is a flammable gaseous fuel made from coal and supplied to the user via a piped distribution system. It is produced when coal is heated strongly in the absence of air. Town gas is a more general term referring to manufactured gaseous fuels produced for sale to consumers and municipalities.[1]

The original coal gas was produced by the coal gasification reaction,[2] and the burnable component consisted of a mixture of carbon monoxide and hydrogen in roughly equal quantities by volume. Thus, coal gas is highly toxic.[3] Other compositions contain additional calorific gases such as methane,[4] produced by the Fischer–Tropsch process, and volatile hydrocarbons together with small quantities of non-calorific gases such as carbon dioxide and nitrogen.

Prior to the development of natural gas supply and transmission—during the 1940s and 1950s in the United States and during the late 1960s and 1970s in the United Kingdom and Australia—almost all gas for fuel and lighting was manufactured from coal. Town gas was supplied to households via municipally owned piped distribution systems. At the time, a frequent method of committing suicide was the inhalation of gas from an unlit oven. With the head and upper body placed inside the appliance, the concentrated carbon monoxide would kill quickly.[5][6] Sylvia Plath famously ended her life with this method.

Originally created as a by-product of the coking process, its use developed during the 19th and early 20th centuries tracking the Industrial Revolution and urbanization. By-products from the production process included coal tars and ammonia, which were important raw materials (or "chemical feedstock") for the dye and chemical industry with a wide range of artificial dyes being made from coal gas and coal tar. Facilities where the gas was produced were often known as a manufactured gas plant (MGP) or a gasworks.

In the United Kingdom the discovery of large reserves of natural gas, or sea gas as it was known colloquially, in the Southern North Sea off the coasts of Norfolk and Yorkshire in 1965[7][8] led to the conversion or replacement of most of Britain's gas cookers and gas heaters from the late 1960s onwards, the process being completed by the late 1970s. Any residual gas lighting found in homes being converted was either capped off at the meter or, more usually, removed altogether. As of 2023, some gas street lighting still remains, mainly in central London and the Royal Parks.

The production process differs from other methods used to generate gaseous fuels known variously as manufactured gas, syngas, Dowson gas, and producer gas. These gases are made by partial combustion of a wide variety of feedstocks in some mixture of air, oxygen, or steam, to reduce the latter to hydrogen and carbon monoxide although some destructive distillation may also occur.

Manufacturing processes

[edit]
Main article: Coal gasification
See also: Gasification and Illuminating gas
Gas Works Park, Seattle, preserves most of the equipment for making coal gas. This is the only such plant surviving in the United States.

Manufactured gas can be made by two processes: carbonization or gasification. Carbonization refers to the devolatilization of an organic feedstock to yield gas and char. Gasification is the process of subjecting a feedstock to chemical reactions that produce gas.[9][10]

The first process used was the carbonization and partial pyrolysis of coal. The off gases liberated in the high-temperature carbonization (coking) of coal in coke ovens were collected, scrubbed and used as fuel. Depending on the goal of the plant, the desired product was either a high quality coke for metallurgical use, with the gas being a side product, or the production of a high quality gas, with coke being the side product. Coke plants are typically associated with metallurgical facilities such as smelters or blast furnaces, while gas works typically served urban areas.

A facility used to manufacture coal gas, carburetted water gas (CWG), and oil gas is today generally referred to as a manufactured gas plant (MGP).

In the early years of MGP operations, the goal of a utility gas works was to produce the greatest amount of illuminating gas. The illuminating power of a gas was related to amount of soot-forming hydrocarbons ("illuminants") dissolved in it. These hydrocarbons gave the gas flame its characteristic bright yellow color. Gas works would typically use oily bituminous coals as feedstock. These coals would give off large amounts of volatile hydrocarbons into the coal gas, but would leave behind a crumbly, low-quality coke not suitable for metallurgical processes.

Coal or coke oven gas typically had a calorific value between 10 and 20 megajoules per cubic metre (270 and 540 Btu/cu ft); with values around 20 MJ/m3 (540 Btu/cu ft) being typical.

The advent of electric lighting forced utilities to search for other markets for manufactured gas. MGPs that once almost exclusively produced lighting gas shifted their efforts towards supplying gas for heating and cooking, and even refrigeration and cooling.

Gas for industrial use

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Main article: Syngas
An illustration of typical polycyclic aromatic hydrocarbons. Source: NASA

Fuel gas for industrial use was made using producer gas technology. Producer gas is made by blowing air through an incandescent fuel bed (commonly coke or coal) in a gas producer. The reaction of fuel with insufficient air for total combustion produces carbon monoxide (CO); this reaction is exothermic and self-sustaining. It was discovered that adding steam to the input air of a gas producer would increase the calorific value of the fuel gas by enriching it with CO and hydrogen (H2) produced by water gas reactions. Producer gas has a very low calorific value of 3.7 to 5.6 MJ/m3 (99 to 150 Btu/cu ft); because the calorific gases CO/H2 are diluted with much inert nitrogen (from air) and carbon dioxide (CO2) (from combustion).

2C (s) + O2 → 2 CO (exothermic producer gas reaction)
C (s) + H2O (g) → CO + H2 (endothermic water gas reaction)
C + 2 H2O → CO2 + 2 H2 (endothermic)
CO + H2O → CO2 + H2 (exothermic water gas shift reaction)

The problem of nitrogen dilution was overcome by the blue water gas (BWG) process, developed in the 1850s by Sir William Siemens. The incandescent fuel bed would be alternately blasted with air followed by steam. The air reactions during the blow cycle are exothermic, heating up the bed, while the steam reactions during the make cycle, are endothermic and cool down the bed. The products from the air cycle contain non-calorific nitrogen and are exhausted out the stack while the products of the steam cycle are kept as blue water gas. This gas is composed almost entirely of CO and H2, and burns with a pale blue flame similar to natural gas. BWG has a calorific value of 11 MJ/m3 (300 BTU/cu ft).

Blue water gas lacked illuminants; it would not burn with a luminous flame in a simple fishtail gas jet as existed prior to the invention of the gas mantle in the 1890s. Various attempts were made to enrich BWG with illuminants from gas oil in the 1860s. Gas oil (an early form of gasoline) was the flammable waste product from kerosene refining, made from the lightest and most volatile fractions (tops) of crude oil. In 1875 Thaddeus S. C. Lowe invented the carburetted water gas process. This process revolutionized the manufactured gas industry and was the standard technology until the end of the manufactured gas era.[11] A CWG generating set consisted of three elements; a producer (generator), carburettor and a super heater connected in series with gas pipes and valves.[12]

During a make run, steam would be passed through the generator to make blue water gas. From the generator the hot water gas would pass into the top of the carburettor where light petroleum oils would be injected into the gas stream. The light oils would be thermocracked as they came in contact with the white hot checkerwork fire bricks inside the carburettor. The hot enriched gas would then flow into the superheater, where the gas would be further cracked by more hot fire bricks.[13]

Gas in post-war Britain

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Mantles in their unused flat-packed form

New manufacturing processes

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Following the Second World War the slow recovery of the British coal mining industry led to shortages of coal and high prices.[14]

UK coal production
Year Production, million tons Production cost, £/ton
1947 197 2.00
1950 216 2.40
1953 223 3.05
1956 222 3.85
1959 206 4.15
1961 191 4.55
1965 187 4.60
1967 172 4.95

The decline of coal as a feedstock for town gas production using carbonisation is demonstrated in this graph.[15]

Coal-based town gas production, millions of therms

New technologies for manufacturing coal gas using oil, refinery tail gases, and light distillates were developed. Processes included the Lurgi Process, catalytic reforming, the catalytic rich gas process, steam reforming of rich gas, and the gas recycle hydrogenator process.[16] The catalytic rich gas process used natural gas as a feedstock to manufacture town gas. These facilities utilised the chemical reaction processes described above.

The rise of oil as a feedstock to manufacture town gas is shown on the graph below. The peak usage in 1968/9 and subsequent decline coincides with the availability of North Sea gas which, over the next few years, displaced town gas as a primary fuel and led to the decline of oil as a feedstock for gas making, as shown.[15]

Oil-based town gas production, millions of therms

Domestic heating

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By the 1960s, manufactured gas, compared with its main rival in the energy market, electricity, was considered "nasty, smelly, dirty and dangerous" (to quote market research of the time) and seemed doomed to lose market share still further, except for cooking where its controllability gave it marked advantages over both electricity and solid fuel. The development of more efficient gas fires assisted gas to resist competition in the market for room heating. Concurrently a new market for whole house central heating by hot water was being developed by the oil industry and the gas industry followed suit. Gas warm air heating found a market niche in new local authority housing where low installation costs gave it an advantage. These developments, the realignment of managerial thinking away from commercial management (selling what the industry produced) to marketing management (meeting the needs and desires of customers) and the lifting of an early moratorium preventing nationalised industries from using television advertising, saved the gas industry for long enough to provide a viable market for what was to come.

Natural gas as feedstock

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In 1959 the Gas Council in Great Britain demonstrated that liquid natural gas (LNG) could be transported safely, efficiently and economically over long distances by sea. The Methane Pioneer shipped a consignment of LNG from Lake Charles, Louisiana, US, to a new LNG terminal on Canvey Island, in the Thames estuary in Essex, England. A 212-mile (341 km) long high-pressure trunk pipeline was built from Canvey Island to Bradford.[17] The pipeline and its branches provided Area Gas Boards with natural gas for use in reforming processes to make town gas. A large-scale LNG reception plant was commissioned on Canvey in 1964, which received LNG from Algeria in two dedicated tankers, each of 12,000 tonnes.[18]

Conversion to natural gas

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The slow decline of the town gas industry in the UK was driven by the discovery of natural gas by the drilling rig Sea Gem, on 17 September 1965, some forty miles off Grimsby, over 8,000 feet (2,400 m) below the seabed. Subsequently, the North Sea was found to have many substantial gas fields on both sides of the median line defining which nations should have rights over the reserves.

In a pilot scheme customers on Canvey Island were converted from town gas to natural gas supplied from the LNG plant on Canvey.[14][19]

The Fuel Policy White Paper of 1967 (Cmd. 3438) pointed the industry in the direction of building up the use of natural gas speedily to 'enable the country to benefit as soon as possible from the advantages of this new indigenous energy source'. As a result, there was a 'rush to gas' for use in peak load electricity generation and in low grade uses in industry.

The growth in availability of natural gas is shown in the graph below.[15] Until 1968 this was from supplies of LNG from Algeria, until North Sea gas was available from 1968.

Natural gas available, millions of therms

The exploitation of the North Sea gas reserves, entailing landing gas at Easington (Yorkshire) Bacton (Norfolk) and St Fergus (Aberdeenshire) made viable the building of a national distribution grid, of over 3,000 miles (4,800 km), consisting of two parallel and interconnected pipelines running the length of the country. This became the National Transmission System. All gas equipment in Great Britain (but not Northern Ireland) was converted (by the fitting of different-sized burner jets to give the correct gas/air mixture) from town gas to natural gas (mainly methane) over the period from 1967 to 1977 at a cost of about £100 million, including writing off redundant town gas manufacturing plants. All the gas-using equipment of almost thirteen million domestic, four hundred thousand commercial, and sixty thousand industrial customers were converted. Many dangerous appliances were discovered in this exercise and were taken out of service.

The UK town gas industry ended in 1987 when operations ceased at the last town gas manufacturing plants in Northern Ireland (Belfast, Portadown and Carrickfergus; Carrickfergus gas works is now a restored gasworks museum).[20] The Portadown site has been cleared and is now the subject of a long-term experiment into the use of bacteria for the purpose of cleaning up contaminated industrial land.

As well as requiring little processing before use, natural gas is non-toxic; the carbon monoxide (CO) in town gas made it extremely poisonous, accidental poisoning and suicide by gas being commonplace. Poisoning from natural gas appliances is only due to incomplete combustion, which creates CO, and flue leaks to living accommodation. As with town gas, a small amount of foul-smelling substance (mercaptan) is added to the gas to indicate to the user that there is a leak or an unlit burner, the gas having no odour of its own.

The organisation of the British gas industry adapted to these changes, first, by the Gas Act 1965 by empowering the Gas Council to acquire and supply gas to the twelve area gas boards. Then, the Gas Act 1972 formed the British Gas Corporation as a single commercial entity, embracing all the twelve area gas boards, allowing them to acquire, distribute and market gas and gas appliances to industrial commercial and domestic customers throughout the UK. In 1986, British Gas was privatised and the government no longer has any direct control over it.

During the era of North Sea gas, many of the original cast iron gas pipes installed in towns and cities for town gas were replaced by plastic.

As reported in the DTI Energy Review 'Our Energy Challenge' January 2006 North Sea gas resources have been depleted at a faster rate than had been anticipated and gas supplies for the UK are being sought from remote sources, a strategy made possible by developments in the technologies of pipelaying that enable the transmission of gas over land and under sea across and between continents. Natural gas is now a world commodity. Such sources of supply are exposed to all the risks of any import.

Gas production in Germany

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In many ways, Germany took the lead in coal gas research and carbon chemistry. With the labours of August Wilhelm von Hofmann, the whole German chemical industry emerged. Using the coal gas waste as feedstock, researchers developed new processes and synthesized natural organic compounds such as Vitamin C and aspirin.

The German economy relied on coal gas during the Second World War as petroleum shortages forced Nazi Germany to develop the Fischer–Tropsch synthesis to produce synthetic fuel for aircraft and tanks.

Coke oven at smokeless fuel plant, South Wales

Issues in gas processing

[edit]

WWI-interwar era developments

[edit]
  • Loss of high-quality gas oil (used as motor fuel) and feed coke (diverted for steelmaking) leads to massive tar problems. CWG (carburetted water gas) tar is less valuable than coal gasification tar as a feed stock. Tar-water emulsions are uneconomical to process due to unsellable water and lower quality by products.
CWG tar is full of lighter polycyclic aromatic hydrocarbons, good for making pitch, but poor in chemical precursors.
  • Various "back-run" procedures for CWG generation lower fuel consumption and help deal with issues from the use of bituminous coal in CWG sets.
  • Development of high-pressure pipeline welding encourages the creation of large municipal gas plants and the consolidation of the MG industry. Sets the stage for rise of natural gas.
  • Electric lighting replaces gaslight. MG industry peak is sometime in the mid-1920s.
  • 1936 or so. Development of Lurgi gasifier. Germans continue work on gasification/synfuels due to oil shortages.
Ruins of the German synthetic petrol plant (Hydrierwerke Pölitz – Aktiengesellschaft) in Police, Poland

Post WWII: the decline of manufactured gas

[edit]
  • Development of natural gas industry. Natural gas has an energy content of 37 MJ/m3, compared to the 10-20 MJ/m3 of town gas.
  • Petrochemicals kill much of the value of coal tar as a source of chemical feed stocks. (BTX, Phenols, Pitch)
  • Decline in creosote use for wood preserving.
  • Direct coal/natural gas injection reduces demand for metallurgical coke. 25 to 40% less coke is needed in blast furnaces.
  • BOF and EAF processes obsolete cupola furnaces. Reduce need for coke in recycling steel scrap. Less need for fresh steel/iron.
  • Cast iron & steel are replaced with aluminum and plastics.
  • Phthalic anhydride production shifts from catalytic oxidation of naphthalene to the o-xylol process.

Post WWII positive developments

[edit]
  • Catalytic upgrading of gas by use of hydrogen to react with tarry vapours in the gas
  • The decline of coke making in the US leads to a coal tar crisis since coal tar pitch is vital for the production of carbon electrodes for EAF/aluminium. US now has to import coal tar from China
  • Development of process to make methanol via hydrogenation of CO/H2 mixtures.
  • Mobil M-gas process for making petrol from methanol
  • SASOL coal process plant in South Africa.
  • Direct hydrogenation of coal into liquid and gaseous fuels
  • Dankuni Coal Complex is the only plant in India that is producing coal gas (town gas) in Kolkata using the Continuous Vertical Retort Technology of Babcock-Woodall Duckham (UK), constructed on the recommendation of GoI's Fuel Policy Committee of 1974 after the crippling 1973 Oil Crisis. The plant uses a modified low temperature carbonisation to produce the town gas and soft coke. The plant in the 1990s produced various chemicals like xylenol, cresol and phenol.[21][22]

By-products

[edit]

The by-products of coal gas manufacture included coke, coal tar, sulfur and ammonia and these were all useful products. Dyes, medicines such as sulfa drugs, saccharine, and dozens of organic compounds are made from coal tar.[citation needed]

The coal used, and the town gas and by-products produced, by the major three gas companies of London are summarised in the table.[23][24][25]

Company Gas, Light and Coke South Metropolitan Commercial
Year 1913 1920 1934 1913 1920 1934 1913 1920 1934
Coal carbonised, tons 1,988,241 2,279,253 3,011,227 1,125,779 1,211,857 1,118,573 187,291 235,406 244,644
Gas made, million cubic feet 29,634 35,149 51,533 14,097 15,182 15,034 3,702 4,340 3,487
Coke made, tons 1,246,624 1,469,220 1,867,038 695,214 743,982 664,555 117,057 158,899 159,019
Coke made, hundredweight per ton of coal (20 hundredweight = 1 ton) 12.54 12.89 12.40 12.35 12.28 11.88 12.50 13.50 13.00
Coal tar made, million gallons 19.88 20.5 31.32 10.81 11.27 12.97 1.97 0.94 2.39
Coal tar made, gallons per ton of coal 10.0 9.0 10.4 9.6 9.3 10.7 10.5 9.4 9.8
Ammoniacal liquor made, million gallons 59.25 61.77 71.06 36.93 37.93 36.69 5.94 6.54 7.41
Ammoniacal liquor made, gallons per ton of coal 29.8 27.1 23.6 32.8 31.3 32.8 31.7 27.8 30.3

Coke

[edit]

Coke is used as a smokeless fuel and for the manufacture of water gas and producer gas.

Coal tar

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Coal tar was subjected to fractional distillation to recover various products, including:

Sulfur

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Used in the manufacture of sulfuric acid.

Ammonia

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Used in the manufacture of fertilisers.

Structure of the UK coal gas industry

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Coal gas was initially manufactured by independent companies but in the United Kingdom many of these later became municipal services. In 1948 there was a total of 1,062 gas undertakings. Both the private companies, about two-thirds of the total, and the municipal gas undertakings, about one-third, were nationalised under the Gas Act 1948. Further restructuring took place under the Gas Act 1972. For further details see British Gas plc.

Apart from in the steel industry's coke ovens' by-products plants, coal gas is no longer made in the UK. It was replaced first by gas made from oil and later by natural gas from the North Sea.

See also

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References

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Further reading

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Coal gas

View on Grokipedia
from Grokipedia
Coal gas is a flammable gaseous produced by heating coal in the absence of air, known as or , resulting in a mixture primarily composed of (about 50%), (about 35%), (about 10%), and smaller amounts of other hydrocarbons like . This process, which dates back to experiments in the late , yields coal gas as a byproduct alongside coke and , and it served as a key energy source for urban illumination, heating, and industrial applications until the mid-20th century. The development of coal gas began in Britain, where Scottish engineer demonstrated its potential in 1792 by producing gas from for lighting, and by 1807, it illuminated public streets in for the first time. In the United States, the first commercial use occurred in 1816 when became the initial city to light its streets with coal-derived gas, followed by widespread adoption in cities like by 1836 and the U.S. Capitol by 1848. Production involved heating in retorts to temperatures around 1,000–1,200°C, releasing volatile components as gas while leaving solid coke behind; this "town gas" had a calorific value of approximately 20.5 kJ per liter. Historically, coal gas powered the Industrial Revolution's urban growth, enabling plants to supply households and factories, but its use declined after the 1940s as abundant pipelines displaced it due to lower costs and cleaner burning. In modern contexts, —a related but distinct high-pressure process using steam and oxygen—produces synthesis gas (), a mixture of and , for in integrated gasification combined cycle () plants or as feedstock for chemicals like and . Despite environmental concerns over emissions like and , advancements allow up to 99.9% removal of pollutants such as and particulates during production.

History

Early Development

The invention of coal gas for lighting is credited to Scottish engineer William Murdoch, who in 1792 successfully produced illuminating gas from coal and demonstrated it by lighting his home and office in Redruth, Cornwall, England. Murdoch, working for the engineering firm Boulton & Watt, heated coal in a retort to generate the gas, marking the first practical application of this process for illumination. The first public demonstration of coal gas lighting occurred on January 28, 1807, when German entrepreneur Frederick Winsor illuminated a section of in with gas lamps, showcasing its potential for street lighting. This event, followed by a larger display on June 4 to celebrate King George III's birthday, drew significant attention despite initial skepticism about safety and reliability. In its early stages, coal gas was primarily produced as a during the carbonization of to manufacture coke for the iron industry, where the gas was initially vented or used sporadically for heating furnaces. This incidental production limited output and purity, as the focus remained on coke for iron rather than gas refinement. Due to high production costs, impure gas quality, and challenges in storage and distribution via early iron pipes, initial applications of coal gas were confined to industrial factories for internal and to lighthouses, such as the 1817 installation at Beavertail Lighthouse in . These settings benefited from the gas's bright flame for extended work hours and navigation safety, but widespread domestic use remained impractical. Early coal gas had a calorific value of approximately 10-20 MJ/m³, providing sufficient luminosity for lighting purposes through its high hydrogen and hydrocarbon content, though it was inadequate for efficient heating applications at the time. This period laid the groundwork for broader adoption during the Industrial Revolution, as technological improvements enabled larger-scale production.

Industrial Expansion

The industrial expansion of coal gas production accelerated in the early 19th century, driven by the formation of dedicated utilities amid Britain's urbanization and Industrial Revolution. The Chartered Gas Light and Coke Company, established in London in 1812 under a royal charter granted to Frederick Winsor, became the world's first public gas supply enterprise, commencing operations at its Vauxhall works in 1813 to produce coal gas primarily for illumination. This venture capitalized on experimental demonstrations, such as the 1807 lighting of Pall Mall—the first public street to use gas lamps—paving the way for commercial scaling. By the 1820s, the company's network had laid 288 miles of pipes, supplying over 51,000 burners across London and fueling the rapid proliferation of gas works nationwide. The technology disseminated swiftly to and , mirroring Britain's coal-driven economy. Paris implemented gas street lighting by 1820, while the New York Gas Light Company was chartered in 1823 to manufacture and distribute gas via cast-iron pipes in . In Britain, expansion was explosive: from a handful of works in the 1810s, the country boasted over 800 gas companies and associated works by 1850, concentrated in industrial centers. These facilities collectively produced around 500 million cubic feet of gas annually by mid-century, supported by abundant domestic reserves that lowered production costs and enabled competitive pricing. Gas lighting's infrastructure transformed public spaces and economies. London's network grew to exceed 1,000 miles of mains by , illuminating over 70,000 street lamps by 1827 alone and extending to factories, homes, and public buildings. This scale was underpinned by coal's ubiquity—Britain mined millions of tons yearly, providing cheap feedstock that made gas a viable alternative to oil lamps or candles. Economically, it spurred infrastructure investment and job creation in and distribution. Socially, coal gas fostered extended urban activity, enabling factories to operate beyond daylight and boosting productivity during the . Safer, brighter streets encouraged , with theaters, taverns, and markets thriving into the evening, thus cultivating a nascent night economy and enhancing overall quality of life in growing cities. This shift from candles to reliable gas illumination marked a key enabler of modern urbanism.

20th Century Shifts

During , coal gas played a vital role in maintaining essential lighting under blackout conditions, with street lamps dimmed or masked to minimize visibility for German raids and later air attacks. Production of coal gas in Britain had reached its peak in the early , supported by the extensive infrastructure of gas works established in the late . These measures ensured continued use for public safety and industrial operations despite wartime disruptions to supply chains. In the interwar period, the coal gas industry adapted by shifting from high-illuminating gas, rich in heavy hydrocarbons for bright flames, to cleaner fuel gas optimized for heating and cooking. This transition was facilitated by innovations such as the addition of carburetted water gas or oil vapors to boost the calorific value, making the gas more efficient for Bunsen burners and gas mantles introduced earlier. The Lurgi gasification process, developed in the late 1920s with the first commercial plant in Germany in 1936, was later implemented in the UK starting in 1960 at Westfield, Scotland, enhancing production efficiency under high-pressure conditions and allowing greater yields from coal feedstocks. These changes reflected a broader move toward versatile domestic and industrial fuel applications amid stabilizing post-war demand. The and saw increasingly displace coal gas for in Britain, as electric bulbs and wiring became more affordable and reliable for homes and streets, with many gas fittings converted or abandoned by the decade's end. However, coal gas retained a strong role in domestic heating and cooking, where its piped delivery and appliance compatibility proved enduring advantages. Similar patterns emerged across , with prioritizing while gas held sway in heating markets, and in the U.S., where urban centers followed suit but overall coal gas expansion was curtailed. Amid the economic depression of the 1930s, British Gas Light and Coke Companies engaged in merger discussions to streamline operations, reduce costs, and counter falling demand from unemployment and competition, exemplified by early amalgamations like the 1924 integration of the Gas Light and Coke Company with the Brentford Gas Company, which set precedents for further consolidation. Globally, coal gas saw limited adoption in the U.S. compared to Britain and Europe, as abundant natural gas discoveries from the 1880s onward—particularly in Pennsylvania and later southwestern fields—provided a cheaper, cleaner alternative via expanding pipelines, diminishing the need for manufactured gas plants after the 1920s.

Manufacturing Processes

Carbonization

Carbonization is the primary historical method for producing coal gas through the of in closed retorts, where the coal is heated to temperatures between 1,000°C and 1,200°C in the absence of oxygen. This process breaks down the complex organic structure of the coal, releasing volatile components as gas while leaving behind solid residues. The reaction fundamentally involves the conversion of coal's carbon content and hydrocarbons into simpler gases and by-products, represented simplistically as the decomposition of coal (C) into (CO), (H₂), (CH₄), and other volatiles. The process typically yields about 300–350 cubic meters of gas per ton of , alongside other products in approximate weight proportions of 70% coke, 25% gas, 4% , and 1% liquor. The resulting coal gas has a composition dominated by combustible components, including roughly 50% (H₂), 35% (CH₄), and 10% (CO), with the balance consisting of minor amounts of , , and hydrocarbons that contribute to its high calorific value of around 20 MJ/m³. By-products such as coke serve as a , while and liquor provide valuable chemical feedstocks, though the focus remains on gas production. This method dominated coal gas manufacturing from the 1810s, following early demonstrations in Britain, through the mid-20th century, powering urban lighting and heating networks. Initially employing horizontal retorts for manual charging and discharging, the process saw efficiency improvements in the 1840s with the introduction of vertical retorts, which allowed continuous operation, better heat distribution, and higher throughput without significantly altering the core decomposition mechanism. Despite its simplicity and widespread adoption, carbonization is inherently inefficient, recovering only 20–30% of the coal's original energy content in the gas, with the majority retained in the coke residue. This limitation stems from the high temperatures required for volatilization, which also lead to significant heat losses and incomplete utilization of the coal's potential energy.

Gasification

Gasification represents an alternative method to carbonization for producing coal gas, involving the reaction of coal or coke with steam and air to generate higher yields of combustible gases through partial oxidation and reduction processes. Unlike carbonization, which relies on thermal decomposition in the absence of air, gasification introduces reactive gases to enhance gas production efficiency and flexibility, particularly for meeting variable demand. This approach was developed to address limitations in traditional coal gas output, enabling the creation of water gas enriched with hydrocarbons for improved calorific value. The carburetted (CWG) process, a primary technique, operates by alternating blasts of air and through a bed of coke in a generator maintained at approximately 1,000°C. During the air blow phase, the coke is heated to incandescence, providing the energy for the subsequent steam run, where reacts with the hot coke to produce a mixture of (CO) and (H₂), known as blue . This is then passed through a where oil vapors are injected and cracked at high temperature, enriching the gas with illuminants such as and other hydrocarbons to form carburetted . The process cycles repeatedly, with typical operation yielding around 280–350 m³ of gas per ton of coke, depending on coke quality and operational parameters. The CWG process was pioneered in the 1870s by , who patented improvements to production in 1875, revolutionizing manufactured gas by combining efficiency with higher output. It gained widespread adoption in by the early 1900s, particularly in Britain and , where it was favored for supplementing carbonization plants during seasonal peak demands for lighting and heating, as its cyclic operation allowed rapid scaling without extensive infrastructure changes. In terms of composition, CWG typically contains about 35% H₂, 25% CO, and 35% hydrocarbons (saturated and unsaturated), with minor amounts of CO₂ (around 5%), resulting in a calorific value of approximately 20–25 MJ/m³, significantly higher than uncarburetted due to the oil enrichment. This elevated CO and H₂ content—often reaching 40% and 45% respectively in optimized runs—provides a cleaner-burning gas suitable for urban distribution, though it necessitates downstream purification to remove impurities like (H₂S), which arises from in the coke and can corrode pipes or poison catalysts if untreated. Common purification involves scrubbers or lime-based absorption to reduce H₂S levels below 20 ppm. A notable variant of is the Lurgi process, developed in in the 1930s as a fixed-bed method operating under pressure (20–30 bar) to improve reaction efficiency and gas quality. In this system, sized is fed into a stationary bed where steam and oxygen (or air) pass countercurrently, producing a low-tar at temperatures around 900–1,000°C; the pressurized conditions minimize tar formation and enhance yield, making it suitable for industrial-scale production pre-World War II. The Lurgi process offered higher throughput than atmospheric but shared similar purification needs for H₂S and particulates. Overall, methods like CWG and Lurgi provided greater operational flexibility than , allowing on-demand production while yielding up to twice the gas volume per unit fuel in some configurations, though at the cost of more complex equipment and raw material preprocessing.

Post-War Variations

In the post-war period, the British coal gas industry faced challenges from rising coal costs and competition from , prompting refinements to traditional processes that had limited due to intermittent operation and byproduct losses. Reformed gas processes emerged in the as a key development, involving of light hydrocarbons such as with steam to produce . Introduced by (ICI), this continuous method operated at high temperatures around 775°C and pressures of 400 psi, yielding gas with approximately 9.4% content and achieving over 90% in the reforming step, far surpassing the 75% of earlier processes. Following , there was a notable shift to oil gasification, using derived from as the primary feedstock instead of , which allowed for more consistent production and addressed coal shortages. This transition increased overall energy recovery in gas manufacture to around 40%, enabling the industry to meet peak demands more effectively while reducing dependence on coking coal. A significant advancement in the involved experiments with continuous vertical retorts in the UK, such as at the plant, which integrated ICI's reforming technology to enhance throughput and operational continuity. These retorts allowed coal or enriched feeds to descend continuously through heated chambers, converting to gas and coke without interruption, effectively doubling output compared to intermittent horizontal retorts and supporting higher production rates. Yield improvements from these hybrid methods reached up to m³ per using enriched feeds, which incorporated oil-derived additives to boost gas volume and calorific value, further diminishing reliance on pure inputs. By , oil-based processes accounted for 50% of UK gas production, extending the viability of coal gas systems into the despite their higher costs relative to emerging alternatives.

Uses

Lighting

Coal gas emerged as a revolutionary illuminant in the early due to its composition rich in hydrocarbons such as and , which burned with a bright, ideal for applications. These illuminating constituents, comprising a significant portion of the gas—often around 4-5% hydrocarbons in typical town gas—produced particles during that glowed intensely, providing superior visibility compared to candles or oil lamps. From the onward, Argand burners, featuring a hollow circular wick surrounded by an air chimney for complete , were widely adopted for coal gas, enhancing flame stability and output to illuminate homes, streets, and factories effectively. By the late , coal gas lighting dominated urban Britain, with over 1,000 supplying illumination to cities and towns by the , far surpassing other methods in scale and reliability. Street lamps, public buildings, and private residences relied on gas for its affordability—costing up to 75% less than oil equivalents—and consistent supply, transforming nighttime urban environments. The invention of the incandescent by in the , commercialized in the 1890s, further boosted efficiency by a factor of five, generating brighter light with reduced gas consumption through incandescence of rare-earth oxides rather than direct flame luminosity. The rise of electric lighting marked the decline of coal gas for illumination, beginning with Thomas Edison's practical incandescent bulb in 1879 and the expansion of electric grids in the following decades. Gas lamps initially offered a luminous efficacy of 1-2 lumens per watt with mantles, but electricity quickly surpassed this, reaching 15 lumens per watt or more by the early 20th century, while providing cleaner, flicker-free light without open flames. By the 1920s, most urban installations had shifted to electricity, rendering gas lighting obsolete for general use. This era of profoundly influenced culture, enabling extended operating hours for theaters—where and stage gas jets created dramatic effects—and night markets, fostering vibrant social and economic activity after dark in cities like and .

Domestic Heating and Cooking

Coal gas found widespread application in domestic heating and cooking following the decline of its primary use for lighting in the early . The first practical gas cookers emerged in the , but their adoption accelerated in the with the introduction of pre-payment meters that made gas more accessible to working-class households, enabling convenient payment for usage. By the 1920s, gas central heating systems began appearing in affluent homes, utilizing piped coal gas networks expanded across urban areas. In , gas maintained a near-monopoly on domestic power in , reflecting intense competition from emerging supplies. Key household appliances relied on the , invented in 1855, which mixed air with coal gas to produce a clean, hot flame suitable for stoves and ovens. Early cast-iron cookers evolved into more efficient models, often combining ovens and hobs, while the calorific value of coal gas—typically adjusted to 18-20 MJ/m³ through enrichment processes—ensured a steady, controllable burn for precise cooking temperatures. These adjustments involved adding hydrocarbons to the gas mixture post-production, optimizing it for domestic without excessive or incomplete burning. Safety enhancements became prominent after , as coal gas's toxicity prompted innovations like pressure governors to regulate flow and prevent over-pressurization, alongside pilot lights that automatically shut off supply if the main flame extinguished, reducing leak risks. These features were integrated into new appliances during the reconstruction, aligning with stricter regulations to mitigate hazards. Domestic coal gas usage peaked from the to the , serving approximately 14 million customers by the late , when the network supported nearly all gas-connected homes for heating and cooking. During , strict coal rationing—limited to 15-20 per household annually—shifted preferences toward gas, which faced lighter restrictions and proved more reliable for essential cooking amid fuel shortages. Gas cooking systems were notably more energy-efficient than traditional ovens, converting fuel to usable heat with less waste and requiring about 30% less input energy for equivalent tasks, thanks to direct flame control and reduced standby losses.

Industrial Applications

Coal gas found extensive application in industrial , particularly in reheating furnaces for iron and production beginning in the mid-19th century. Its use in these processes, starting around the , leveraged the gas's high content of (CO) and (H₂), which created a that prevented oxidation of the metal during heating. This was crucial for maintaining the quality of billets and slabs as they were prepared for rolling mills, allowing for efficient high-temperature operations up to approximately 1,400°C. Industrial-grade coal gas was often supplied unpurified, retaining higher levels of CO (typically 10-20%) compared to the refined town gas used for , which enhanced its calorific value and suitability for combustion-intensive metallurgical tasks. In power generation, coal gas powered early internal combustion engines and electrical generators, marking a shift from steam-based systems. The Lenoir engine, developed in the and commercialized in the 1870s, operated on a mixture of gas and air, achieving about 4% while providing reliable mechanical power for factories and workshops. By the late , gas engines fueled by gas or related producer gases became common in industrial settings, such as the estate in , where Mond gas—a variant derived from —drove generators supplying to over 100 companies from 1902 onward. These applications contributed significantly to industrial energy needs in the UK, where manufactured gases accounted for a growing share of non-domestic consumption by 1900. As a chemical feedstock, coal gas served as a precursor for in the Haber-Bosch process for synthesis during the 1910s, when industrial-scale production of s and explosives demanded large volumes of hydrogen-rich gases. techniques, including of coal gas components, produced the necessary H₂ and N₂ mixtures, supporting the global expansion of . This role underscored coal gas's versatility beyond , enabling key advancements in synthetic chemistry. However, by the post-1950s era, coal gas in industrial applications declined sharply, supplanted by cheaper for power and heating, and for both fuel and feedstock needs, leading to the phase-out of most plants by the .

Regional Developments

Production in Britain

The production of coal gas in Britain began with the establishment of the world's first public gas supply company, the , in in 1812. This marked the start of commercial coal gas manufacturing, initially focused on street lighting, with rapid expansion driven by urban growth and industrial demand. By the mid-19th century, the industry had grown to encompass approximately 200-300 gas undertakings across Britain, reflecting a fragmented network of private and municipal operations. Key policies shaped the industry's development and safety standards. The Gas Works Clauses Act of 1847 standardized construction requirements, regulated maximum profits at 10 percent, and established uniform provisions for infrastructure to ensure safe and reliable supply to towns. Production peaked in 1913 at 300 billion cubic feet annually, supporting widespread adoption for and heating. Britain was a dominant producer of coal gas in by 1900, underscoring its leadership in the sector. Regionally, production was concentrated in the industrial north of , where dense manufacturing hubs necessitated large-scale output. By the interwar period, coal gas had become integral to domestic life, with significant growth in household connections, up from 7.4 million customers in to 11.2 million in 1938. The scale continued to expand, reaching over 1,100 undertakings by 1943 and annual production of 400 billion cubic feet by 1948, just before . The Gas Act of 1948 centralized the fragmented industry under public ownership, creating 12 regional Area Gas Boards to oversee production, distribution, and by-product management, thereby streamlining operations and addressing wartime disruptions. This , effective from 1949, integrated the diverse local entities into a unified national framework, ensuring equitable supply amid post-war reconstruction.

Production in Germany

Coal gas production in began in the early 19th century, with the establishment of the first gas works in in 1826 to supply lighting and heating for the city. By the early , the industry had expanded significantly, supporting urban infrastructure and industrial needs through numerous local plants. 's coal gas sector emphasized research and innovation, particularly in techniques for producing synthesis gas under high pressure. In 1927, Lurgi GmbH developed the Lurgi dry-ash process, initially for town gas production, which enabled more efficient conversion of coal into combustible gases suitable for industrial applications. This advancement built on earlier methods and positioned as a leader in coal-derived fuels. During , coal gas by-products, such as those from , played a critical role in chemical manufacturing, including explosives essential to the war effort. The saw further breakthroughs with the Fischer-Tropsch process, invented in 1925 by Franz Fischer and Hans Tropsch at the Kaiser Wilhelm Institute, which converted coal-derived into liquid hydrocarbons for . During , amid severe oil shortages, this technology scaled up dramatically; by early 1944, 25 synthetic fuel plants produced over 124,000 barrels per day—equivalent to approximately 6 million tons annually—supplying more than 90% of Germany's and half its total petroleum needs. Post-war, many synthetic fuel facilities were dismantled by Allied forces, and the coal gas industry faced decline as West Germany shifted toward imported natural gas in the 1960s, reducing reliance on coal-derived town gas for domestic and industrial use. This transition marked the end of Germany's dominance in coal gasification for energy, though the technologies influenced global research.

Production in Other Regions

Early coal gas production also developed in France, where the first public occurred in in 1813, and in the United States, with commercial street lighting in in 1816. These regions saw rapid urban adoption similar to Britain, though on a smaller scale initially.

Post-War Era

Innovations and Challenges

In the post-World War II era, the UK coal gas industry saw significant technical innovations aimed at enhancing efficiency and output. By the 1950s, the adoption of continuous retorts marked a key advancement, allowing for uninterrupted coal processing as the material passed downward through vertical structures, replacing labor-intensive batch methods and increasing production capacity. Complementary developments included the integration of automatic controls, which enabled precise regulation of temperature, pressure, and gas flow, reducing manual intervention and improving operational reliability in . Sulfur removal processes were refined using scrubbers, where (H₂S) in the raw gas reacted with to form , thereby purifying the output for safer distribution. Despite these innovations, operational challenges persisted, particularly with tar deposition, which accumulated in pipes and equipment, leading to clogs that disrupted flow and required frequent maintenance. H₂S, even after initial scrubbing, posed risks to metal infrastructure, necessitating advanced purification techniques; the 1930s Ogilvie process, involving selective absorption, was one such method employed to mitigate these effects by targeting H₂S more effectively before distribution. Wartime strains in the exacerbated these issues, as shortages in the UK prompted temporary shifts to alternatives, where wood was gasified in portable generators to supplement town gas supplies during supply disruptions. Purification steps in coal gas production achieved high efficiency, removing impurities like sulfur compounds and tar vapors, though post-WWII implementation drove costs up due to enhanced equipment and materials needs. The 1948 nationalization of the gas industry under the Gas Act consolidated over 1,000 undertakings into 12 regional boards and a central Gas Council, fostering coordinated efforts that accelerated innovations in purification and technology.

Decline and Transition

The discovery of in the in December 1965, particularly the Viking Gas Field by and the , marked a pivotal trigger for the decline of coal gas production in the UK. This find prompted the Gas Council to announce in 1966 a nationwide shift to , which offered a higher calorific value of approximately 38-39 MJ/m³ compared to coal gas's 20 MJ/m³, enabling more efficient energy delivery and reducing production costs. The UK's conversion program, spanning 1967 to 1977, systematically retrofitted the gas network and appliances to accommodate . This effort involved converting around 12-14 million households and approximately 40 million appliances, including cookers, fires, and industrial equipment, at no direct cost to consumers; the industry absorbed the expenses through government-backed funding. The reached £600 million (equivalent to several billion in modern terms), covering expansions, reforming facilities, and on-site modifications, with peak annual conversions hitting 2.3 million appliances. As the transition progressed, coal gas manufacturing plants phased out rapidly. In , the last such facilities, including the reforming plants at in , ceased operations in 1976, while Northern Ireland's remaining town gas plants in , , and closed in 1987 due to delayed integration with the mainland grid. By 1980, manufactured gas had dropped from nearly 100% of the 's gas supply in 1960—specifically 90% derived from coal—to 0%, fully supplanted by imports and domestic production. Globally, the decline of coal gas followed a similar pattern driven by abundant natural gas reserves. In the United States, manufactured gas began waning in the 1930s as pipelines from and other fields made widely available and cheaper, leading utilities to convert plants through the mid-1950s. Across , transitions occurred variably from the 1960s onward, accelerated by discoveries like the Groningen field in the in 1959; countries such as and phased out coal gas production by the 1980s in favor of imported and local networks.

By-Products

Coke

Coke is the primary solid by-product generated during the of in the production of coal gas, resulting from the heating of in retorts to drive off volatile gases and liquids. The process typically yields 545 to 635 kg of coke per metric ton of carbonized, depending on the coal type and carbonization conditions. This coke exhibits low content, often less than 1%, and a high fixed carbon content of 85-90%, making it suitable for various applications. The quality of coke from coal gas production is generally harder and cleaner than coke produced from raw coal in traditional methods, with a calorific value ranging from 28 to 30 MJ/kg. It served as a key in blast furnaces for iron and steel production, contributing to the industry's expansion during the industrial era. Additionally, from the onward, it was promoted as a smokeless domestic in the UK, particularly in urban areas under smokeless zone regulations to reduce . Economically, 19th-century developments saw coke ovens integrated with gas works to optimize recovery and efficiency. By 1900, gas plants played a substantial role in coke supply, with production from such facilities supporting broader industrial needs. Coke sales generated significant revenue for gas works, thereby bolstering the financial viability of coal gas operations and aiding the industry's growth.

and Chemicals

, a thick, black of coal gas production, is typically yielded at rates of 20-50 liters per metric ton of carbonized, depending on process conditions and coal type. This yield corresponds to roughly 3-4% by weight of the coal input. Through , the tar is separated into distinct fractions based on boiling points, yielding key aromatic hydrocarbons such as (from the light oil fraction), , and (from the middle oil fraction). These compounds form the foundational feedstocks for the organic , transforming coal tar from an initial waste stream into a cornerstone of industrial chemistry. The development of coal tar processing accelerated in the during the 1850s with of dedicated tar distilleries, driven by the need to valorize byproducts from expanding . A landmark event occurred in 1856 when British chemist synthesized , the world's first aniline-based synthetic dye, from -derived aniline, ushering in the era of artificial colorants and spurring the growth of the dye industry. By 1914, synthetic dyes derived from intermediates dominated global production, with approximately 90% of the world's dyes manufactured in using these sources. derivatives also enabled pharmaceutical advancements, serving as precursors for compounds like in the synthesis of aspirin. In infrastructure, coal tar found widespread application in road construction through the early 1900s, where it was mixed with aggregates to create durable surfaces resistant to water penetration. , obtained as a heavy , became a standard wood preservative due to its fungicidal and insect-repellent properties, protecting railway sleepers, telegraph poles, and marine timbers from decay. The distillation residue, known as pitch, was essential for producing carbon electrodes used in electrolytic processes for aluminum and steelmaking. Economically, the shift elevated coal tar's status from a nuisance byproduct to a high-value ; by the 1930s, the tar distillation sector generated an estimated annual value of around £10 million, supporting a network of specialized chemical plants.

Ammonia and Sulfur

During the production of coal gas through the carbonization of , was liberated as a gaseous component and absorbed in water to form ammonia liquor, a valuable by-product used primarily for production. Typically, 2.5 to 3 kg of was recovered per ton of dry processed in coke ovens or gas works, though yields could vary up to 5 kg depending on coal type and efficiency. The recovery , refined in the 1870s with the introduction of ammonia stills, involved distilling the liquor with steam to release free gas, which was then absorbed in to produce ammonium sulfate, a key nitrogen . This method complemented the Haber-Bosch after the , providing a low-cost by-product source of that reduced reliance on synthetic production during periods of high demand, such as World Wars I and II, when it supported explosives and needs by minimizing imports. Sulfur recovery from coal gas focused on removing (H₂S), a toxic impurity formed during , through scrubbing processes that captured it for conversion into elemental or . The , patented in 1883 by Carl Friedrich Claus, became the standard method in the 1880s for this recovery, involving partial combustion of H₂S to followed by catalytic reaction with remaining H₂S to yield elemental , achieving 95-98% efficiency. This by-product was essential for production, supporting industrial applications like fertilizers and chemicals. By the 1930s, the UK coal gas industry produced approximately 100,000 tons of annually from s, primarily as , making it a major contributor to domestic supplies before . These inorganic recoveries not only offset purification costs but also enhanced agricultural productivity amid global supply constraints. With the decline of coal gas production after the 1940s due to the adoption of , outputs such as coke, , , and significantly decreased, becoming negligible by the 1970s as town gas works were phased out.

Industry Structure

UK Gas Industry Organization

The British coal gas industry in the developed as a decentralized network of private enterprises, each established through individual local acts of that granted monopolies for gas supply within defined localities. By 1900, more than 1,000 such private companies operated across the country, handling production, distribution, and sales on a local scale, with regulation focused on pricing caps, service obligations, and infrastructure standards set by these acts. Efforts to address the inefficiencies of this fragmentation began in the , with a series of between 1929 and 1939 that consolidated operations and significantly reduced the number of independent companies. These consolidations were encouraged by government policy to enhance , improve technical standards, and coordinate supply amid economic pressures, though the industry remained largely private and locally oriented. The pivotal shift toward national organization came with the Gas Act 1948, which nationalized the entire sector by vesting all private and municipal undertakings in a new public authority structured as 12 geographically defined area gas boards. Each board managed regional production from plants, distribution networks, and consumer services, marking the end of local autonomy and introducing uniform national oversight. The act also mandated standardization of gas quality, requiring a minimum calorific value of 4,800 kcal/m³ to ensure reliability and across regions. Post-nationalization, the structure evolved further under the Gas Act 1973, which centralized authority by creating the British Gas Corporation (BGC) as a to supervise and integrate the 12 area boards into a unified national operation. At its peak in the , the BGC employed around 100,000 workers, supporting extensive gas production and infrastructure maintenance. Regulatory frameworks throughout this evolution tied gas pricing directly to acquisition and production costs, enabling models that included a regulated while protecting consumers from excessive charges. To promote equitable access, government subsidies facilitated network extensions into rural and underserved areas, often covering a significant portion of connection costs for remote consumers.

Economic Impacts

The coal gas industry played a pivotal role in the during the 19th and early 20th centuries, generating substantial revenue from both gas sales and valuable by-products derived from coal carbonization. By the , gas sales constituted approximately 60% of the industry's total income, while by-products such as coke, , and chemicals accounted for the remaining 40%, contributing around £20 million annually to economic output. These by-products not only provided direct financial returns but also funded significant portions of infrastructure expansions, including new retorts and distribution networks, in the , enabling the sector's rapid growth. In terms of broader economic contributions, the coal gas sector supported a significant portion of the UK's energy needs in the energy sector prior to the , as coal-derived gas met a notable share of domestic and industrial and heating needs. It also catalyzed the growth of the by supplying key raw materials like benzol, toluol, and sulphate, which were essential for dyes, explosives, and fertilizers, thereby fostering related and exports. Employment impacts were notable, with around 50,000 direct jobs in gas production and distribution during , alongside indirect employment in the sector that supplied the 20 million tons of consumed annually by the early 1920s. The decline of coal gas in the era brought mixed economic effects, particularly with the transition to in the . The conversion program, which involved replacing carbonization plants and adapting millions of appliances, cost approximately £600 million (equivalent to about £3.3 billion in adjusted terms), but it ultimately reduced reliance on imported and lowered long-term production expenses, yielding substantial savings for the national economy. This shift marked the end of an era where coal gas had underpinned industrial and household , though it preserved economic stability by integrating cheaper North Sea supplies.

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