Dichloromethane (DCM), is a chemical compound with the formula CH2Cl2. This chemical has a Chloroform like odor and is colorless. It is used as an organic solvent. Although it is not miscible with water, it is miscible with other organic solvents


Natural sources of dichloromethane include oceanic sources, macroalgae, wetlands, and volcanoes. However, the majority of dichloromethane in the environment is the result of industrial emissions.


Dichloromethane is created by either treating chloromethane, or methane at 400 - 500 celcius. These are several reactions to prepare DCM

CH4 + Cl2 = CH3Cl + HCl

CH3Cl + Cl2 = CH2Cl2

DCM was first prepared in 1839 by the French chemist Henri Victor Regnault (1810–1878), who isolated it from a mixture of chloromethane and chlorine that had been exposed to sunlight.


DCM's volatility and ability to dissolve a wide range of organic compounds makes it a useful solvent for many chemical processes. In the food industry, it is used to decaffeinate coffee and tea as well as to prepare extracts of hops and other flavourings. Its volatility has led to its use as an aerosol spray propellant and as a blowing agent for polyurethane foams.


Dichloromethane - Wikipedia