Methylene dichloride
Methylene dichloride;Methylene chloride;Dichloromethane;Methane,dichloro-

Molecular formula : CH2Cl2
MW : 84.93
CAS, introductory-09-2

nature : a transparent colorless volatile liquid, with similar irritating smell of ether. About 50 times more soluble in water, soluble phenol, aldehydes, ketones, acetic acid, triethyl phosphate, ethyl acetoacetate, cyclohexylamine. With other chlorinated hydrocarbon solvents and alcohol, ether and N, N - dimethyl formamide immiscibility. Solidification point -95 ° C, 40 ° C boiling point. The relative density of 1.3348 (15 / 4 ° C), 1.3167 (25 / 4 ° C), 1.3077 (20 / 4 ° C), melting point -95.1 ° C, 640 ° C spontaneous combustion point, viscosity (20 ° C) 0. 43mPa s, the rate of 1.4244 refractive index, the critical temperature of 245 ° C, critical pressure 6.171MPa. Antipyretic generated HCl and trace phosgene, and the long-term water heating, formaldehyde formation and HCl. Further chlorination, available CHCl3 and CCl4.

Preparation : used mainly methane chloride and methanol chlorination. 1. France methane methane chloride, chlorine gas and recycled into the mixing reactor, 380-400 ° C for heat chlorination. 2. Methanol chloride France, Japan and Germany Shan Cao companies methanol, raw materials for the production of chlorine dichloromethane. Industry also used to make methyl chloride raw materials, heat-chloride or dichloromethane chloride production methods.

purposes : In addition to the materials used in organic synthesis, but also the extensive use of cellulose acetate film, cellulose acetate placed three oil dewaxing, aerosols and antibiotics, vitamins, steroidal compounds production of solvents and metal surface layer paint cleaning and degreasing from abroad. In addition, for low grain fumigation and freezers and air conditioning refrigeration device. The polyether urethane-foam production for the auxiliary blowing agent, and for polysulfone - extrusion foam blowing agents.