The basic physical properties of dichloromethane

Product name Dichloromethane; Methylene chloride; Methylene dichloride
Product alias
Molecular Formula CH2Cl2
Product use is non-flammable low-boiling solvent, widely used in pharmaceutical, plastic and film industries
CAS number 75-09-2
Toxicity protection toxicity is very small, and wake up faster after poisoning, it can be used as anesthetic. Irritating to skin and mucous membranes. The oral LD50 of young adult rats was 1.6 ml/kg. The maximum allowable concentration in air is 0.0005. Gas masks should be worn during the operation, and they should be immediately removed from the scene after poisoning and treated symptomatically.
The packaging and storage use galvanized iron drums to close the package, 250kg per barrel, train tank cars, cars can be transported. Should be stored in a cool dark, dry, well-ventilated place, pay attention to moisture.
Physical and chemical properties colorless transparent volatile liquid. Has a pungent odor similar to ether. Soluble in about 50 times water, soluble in phenol, aldehyde, ketone, glacial acetic acid, triethyl phosphate, ethyl acetoacetate, cyclohexylamine. It is miscible with other chlorinated hydrocarbon solvents such as ethanol, ** and N,N-dimethylformamide. The relative density is 1.3266 (20/4°C). Melting point -95.1 °C. Boiling point 40 °C. Self-ignition point 640 °C. Viscosity (20°C) 0.43 mPa·s. The refractive index nD (20 °C) 1.4244. Critical temperature 237 °C, critical pressure 6.0795MPa. After pyrolysis, HCl and traces of ** are produced, which are heated with water for a long period of time to produce formaldehyde and HCl. Further chlorination gives CHCl3 and CCl4.

Quality Standard GB 4117-83
Molecular weight structural formula consumption quota raw material name specification consumption, kg/t
1, natural gas chlorination
** 100% 4000
Natural gas (standard condition) Methane content 97% 1000m3/t
Liquid caustic 100% 274
2. Chloromethane Chlorination Methyl Chloride ≥98% 746
** ≥99.5% 854
Caustic soda 30% 221