The molecular formula of barreled methylene chloride is CH2Cl2. It is a colorless and transparent liquid with the advantages of strong solubility and low toxicity. It is slightly soluble in water and is a non-flammable low-boiling solvent. It is widely used in chemical production. As a raw material, it is widely used in the manufacture of polycarbonate; as a reaction medium, it is used in the preparation of ampicillin, oxypicillin and vanillin in the pharmaceutical and other chemical industries; as an organic solvent, it can Used as organic synthesis extractant, etc.

It can be seen from the above data that barreled methylene chloride has a low boiling point, very low solubility in water and high relative density with water. Therefore, for methylene chloride in wastewater, it can be naturally separated from the water phase by standing; The stripping method escapes from the wastewater by heating; there is also a precipitation method, which can add dialkylamine (such as diethylamine, dibutylamine, etc.), sodium hydroxide and carbon disulfide to the wastewater to generate dialkylamine yellow sodium ortho-ortho, which is then precipitated as a solid with it in the presence of oxygen.

At room temperature, barreled methylene chloride is a colorless, transparent, heavier than water, volatile liquid, slightly soluble in water, miscible with most common organic solvents, and has a pungent odor similar to ether. Dichloromethane has a low boiling point and is easy to volatilize during industrial production and cause environmental pollution, so it must be regulated when used.