【Physical and chemical properties】Colorless, odorless and flammable liquid. Boiling point 238.4 ℃. Melting point -49.2 ℃. Flash point 128 ℃. Relative density 1.2047. Refractive index l.4218. Miscible with ether, acetone, benzene, chloroform, ethyl acetate, etc., soluble in water and carbon tetrachloride. The ability to absorb carbon dioxide is very strong, and the chemical properties are stable.
【Usage】It is a polar solvent, used as a plasticizer, a spinning solvent, a dispersant for water-soluble dyes and pigments. It can also be used as an extractant for oily solvents and olefins and aromatic hydrocarbons. Propylene carbonate as the electrolyte of the battery can withstand harsh light, heat and chemical changes. It also has certain uses in geological mineral processing and analytical chemistry. In addition, propylene carbonate can also be used as a wood adhesive instead of phenolic resin, and it is also used to synthesize dimethyl carbonate.
【Method】(1) Phosgene method. Propylene glycol reacts with phosgene to generate hydroxyisopropyl chloroformate, and then reacts with sodium hydroxide to generate propylene carbonate, which is then distilled under reduced pressure to obtain the finished product.