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Bromomethane AI simulator
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Bromomethane AI simulator
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Bromomethane
Bromomethane, commonly known as methyl bromide, is an organobromine compound with formula CH3Br. This colorless, odorless, nonflammable gas is produced both industrially and biologically. It is a recognized ozone-depleting chemical. According to the IPCC Fifth Assessment Report, it has a global warming potential of 2. The compound was used extensively as a pesticide until being phased out by most countries in the early 2000s. From a chemistry perspective, it is one of the halomethanes.
Marine organisms are estimated to produce 56,000 tonnes annually. It is also produced in small quantities by certain terrestrial plants, such as members of the family Brassicaceae.
In 2009, an estimated 24,000 tonnes of methyl bromide were produced. Its production was curtailed by the Montreal Protocol, such that in 1983, production was nearly twice that of 2009 levels. It is manufactured by treating methanol with bromine in the presence of sulfur or hydrogen sulfide:
Most methyl bromide is used for fumigation purposes, while some is used to manufacture other products. It is widely applied as a soil sterilant, mainly for production of seed but also for some crops such as strawberries and almonds. Bromomethane is safer and more effective than some other soil sterilants. Its loss to the seed industry has resulted in changes to cultural practices, with increased reliance on soil steam sterilization, mechanical roguing, and fallow seasons.[citation needed] Bromomethane was also used as a general-purpose fumigant to kill a variety of pests including rats and insects. Bromomethane has poor fungicidal properties. Bromomethane is the only fumigant allowed (heat treatment is the only other option) under ISPM 15 regulations when exporting solid wood packaging (fork lift pallets, crates, bracing) to ISPM 15 compliant countries. Bromomethane is used to prepare golf courses, particularly to control Bermuda grass. The Montreal Protocol stipulates that bromomethane use be phased out.
Bromomethane is also a precursor in the manufacture of pharmaceuticals such as neostigmine bromide, pancuronium bromide, propantheline bromide, pyridostigmine bromide, atropine derivatives, clidinium bromide, clobazam, demecarium bromide, glycopyrrolate, and vecuronium bromide. It is a precursor to many ordinary chemicals often as a methylating agent.
Bromomethane was once used in specialty fire extinguishers, prior to the advent of less toxic halons, as it is electrically non-conductive and leaves no residue. It was used primarily for electrical substations, military aircraft, and other industrial hazards. It was never as popular as other agents due to its high cost and toxicity. Bromomethane was used from the 1920s to the 1960s, and continued to be used in aircraft engine fire suppression systems into the late 1960s.[citation needed]
Bromomethane is readily photolyzed in the atmosphere to release bromine radicals, which are far more destructive to stratospheric ozone than chlorine. As such, it is subject to phase-out requirements of the 1987 Montreal Protocol on Ozone Depleting Substances.
The London Amendment in 1990 added bromomethane to the list of ODS to be phased out. Phase-out began in the United States in 1993, manufactured amounts being capped at the 1991 level. All developed countries in the Montreal Protocol reduced both manufactured and imported amounts by 25% in 1999, 50% 2001, 75% 2003, 100% 2005. In 2003 the Global Environment Facility approved funds for a UNEP-UNDP joint project for methyl bromide total sector phase out in seven countries in Central Europe and Central Asia, which was due for completion in 2007.
Bromomethane
Bromomethane, commonly known as methyl bromide, is an organobromine compound with formula CH3Br. This colorless, odorless, nonflammable gas is produced both industrially and biologically. It is a recognized ozone-depleting chemical. According to the IPCC Fifth Assessment Report, it has a global warming potential of 2. The compound was used extensively as a pesticide until being phased out by most countries in the early 2000s. From a chemistry perspective, it is one of the halomethanes.
Marine organisms are estimated to produce 56,000 tonnes annually. It is also produced in small quantities by certain terrestrial plants, such as members of the family Brassicaceae.
In 2009, an estimated 24,000 tonnes of methyl bromide were produced. Its production was curtailed by the Montreal Protocol, such that in 1983, production was nearly twice that of 2009 levels. It is manufactured by treating methanol with bromine in the presence of sulfur or hydrogen sulfide:
Most methyl bromide is used for fumigation purposes, while some is used to manufacture other products. It is widely applied as a soil sterilant, mainly for production of seed but also for some crops such as strawberries and almonds. Bromomethane is safer and more effective than some other soil sterilants. Its loss to the seed industry has resulted in changes to cultural practices, with increased reliance on soil steam sterilization, mechanical roguing, and fallow seasons.[citation needed] Bromomethane was also used as a general-purpose fumigant to kill a variety of pests including rats and insects. Bromomethane has poor fungicidal properties. Bromomethane is the only fumigant allowed (heat treatment is the only other option) under ISPM 15 regulations when exporting solid wood packaging (fork lift pallets, crates, bracing) to ISPM 15 compliant countries. Bromomethane is used to prepare golf courses, particularly to control Bermuda grass. The Montreal Protocol stipulates that bromomethane use be phased out.
Bromomethane is also a precursor in the manufacture of pharmaceuticals such as neostigmine bromide, pancuronium bromide, propantheline bromide, pyridostigmine bromide, atropine derivatives, clidinium bromide, clobazam, demecarium bromide, glycopyrrolate, and vecuronium bromide. It is a precursor to many ordinary chemicals often as a methylating agent.
Bromomethane was once used in specialty fire extinguishers, prior to the advent of less toxic halons, as it is electrically non-conductive and leaves no residue. It was used primarily for electrical substations, military aircraft, and other industrial hazards. It was never as popular as other agents due to its high cost and toxicity. Bromomethane was used from the 1920s to the 1960s, and continued to be used in aircraft engine fire suppression systems into the late 1960s.[citation needed]
Bromomethane is readily photolyzed in the atmosphere to release bromine radicals, which are far more destructive to stratospheric ozone than chlorine. As such, it is subject to phase-out requirements of the 1987 Montreal Protocol on Ozone Depleting Substances.
The London Amendment in 1990 added bromomethane to the list of ODS to be phased out. Phase-out began in the United States in 1993, manufactured amounts being capped at the 1991 level. All developed countries in the Montreal Protocol reduced both manufactured and imported amounts by 25% in 1999, 50% 2001, 75% 2003, 100% 2005. In 2003 the Global Environment Facility approved funds for a UNEP-UNDP joint project for methyl bromide total sector phase out in seven countries in Central Europe and Central Asia, which was due for completion in 2007.