Dichloromethane is a compound formed by chlorine substitution of two hydrogen atoms in methane molecule, the molecular formula CH2Cl2. It is a colorless, transparent, specific water weight, volatile liquid, with similar ether odor and sweetness, does not burn, but mixed with high concentration of oxygen to form an explosive mixture. Methylene dichloride is slightly soluble in water. It is soluble with most commonly used organic solvents. It can also be mixed with other chlorine-containing solvents, ether, ethanol and N, N-dimethylformamide in any proportion. Dichloromethane is insoluble in liquid ammonia at room temperature. It can dissolve quickly in phenol, aldehyde, ketone, glacial acetic acid, triethyl phosphate, formamide, cyclohexylamine and ethyl acetoacetate.
|Water by Karl Fischer Titration||0.01%max||0.001%|
|UV Cutoff||233nm max||230nm|
|Electron Capture GC||10ng/L||<10ng/L|
|Flame LonizationGC(as nonane)||5ppb||<5ppb|
1.Solvents are the most important uses of dichloromethane. Dichloromethane has strong solubility, low boiling point, relatively low toxicity and relatively best inertia, making it the most frequently used organic solvent in organic synthesis. As a solvent, its status is almost equal to that of water in inorganic salt chemistry. It is widely used in the manufacture of safe film and polycarbonate, and the rest are used as paint solvent, metal degreaser, smoke spray, polyurethane foaming agent, release agent and paint stripper.
2.In pharmaceutical industry, it is used as reaction medium to prepare ampicillin, hydroxybenzylpenicillin and pioneering mycin. It is also used as solvent in film production, petroleum dewaxing solvent, aerosol propellant, organic synthetic extractant, polyurethane foaming agent and metal cleaning agent for foam plastics production.