Dichloromethane Sciene Report

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Dichloromethane Chloride

[Dichloromethane][[1]]or methylene chloride is the chemical compound with the formula CH2Cl2. It is a colorless, volatile liquid with a moderately sweet aroma. It is widely used as a solvent, the general view being that it is one of the less harmful of the chlorocarbons. Dichloromethane was first prepared in 1840 by the French chemist Henri Victor Regnault, who isolated it from a mixture of chloromethane and chlorine that had been exposed to sunlight.

Dichloromethane is produced industrially by reacting either methyl chloride or methane with chlorine gas at 400-500 °C. At these temperatures, both methane and methyl chloride undergo a series of reactions producing progressively more chlorinated products.

The output of these processes is a mixture of methyl chloride, dichloromethane, chloroform, and carbon tetrachloride. These compounds are separated by distillation.

There are the many uses of dichloromethane. Dichloromethane volatility and ability to dissolve a wide range of organic compounds makes it an ideal solvent for many chemical processes. It is widely used as a paint stripper and a degreaser. In the food industry, it is used to decaffeinate coffee and to prepare extracts of Hops. Hops are a flower used primarily as a flavoring and stability agent in beer, as well as in herbal medicine. It is used to chemically weld certain plastics (for example, it is used to seal the casing of electric meters). Its volatility has led to its use as an aerosol spray propellant. It is also used as a fumigant pesticide for stored strawberries and grains. Concerns about its health effects have led to a search for alternatives in many of these applications. It is used in Christmas lights called bubble lights, in a sealed vial which bubbles when the incandescent light bulb below it is lit. The bubble tubes were up to 30 inches long and used resistors to provide the heat to boil the liquid in a small constricted chamber that had bits of rock and a special glass valve to concentrate the small bubbles into larger ones. It is still used today in their reproduction machines. Dichloromethane is quite often used as a farming tool in Eastern and Central America as a gene adaptation tool.

Dichloromethane is the least toxic of the simple chlorohydrocarbons, but it is not without its health risks as its high volatility makes it an acute inhalation hazard. Dichloromethane is also metabolized by the body to carbon monoxide potentially leading to carbon monoxide poisoning. Prolonged skin contact can result in the dichloromethane dissolving some of the fatty tissues in skin, resulting in skin irritation or chemical burns. It may be carcinogenic, as it has been linked to cancer of the lungs, liver, and pancreas in laboratory animals. Dichloromethane is a mutagen/teratogen and crosses the placenta, causing fetal toxicity in women who are exposed to it during pregnancy. In animal experiments it was fetotoxic at doses that were maternally toxic but no teratogenic effects were seen. In many countries products containing dichloromethane must carry labels warning of its health risks. For more information, click this link [2]

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