Introduction

Cyclic carbonates include five-membered, six-membered, seven-membered carbonates and macrocyclic carbonates with seven or more members, among which propylene carbonate and ethylene carbonate are the most widely used. Ethylene carbonate is an excellent polar high-boiling point solvent and surfactant raw material, widely used in plastics, printing and dyeing, polymer synthesis, gas separation and electrochemistry.

Chemical properties: Colorless, odorless, flammable liquid. Miscible with ether, acetone, benzene, chloroform, ethyl acetate, etc., soluble in water and carbon tetrachloride

Uses: Used as oily solvent, spinning solvent, olefin and aromatic extractant, carbon dioxide absorbent, dispersant for water-soluble dyes and pigments, etc.

Production methods 1. Phosgene method The raw material propylene glycol reacts with phosgene to generate hydroxyisopropyl chloroformate, which then reacts with sodium hydroxide to generate propylene carbonate, and then the finished product is obtained by vacuum distillation. 2. Ester exchange method. 3. Chloropropanol method. 4. Propylene oxide and carbon dioxide synthesis method Carbon dioxide and propylene oxide react at 150-160℃Chemicalbook and 5MPa to generate propylene carbonate. The finished product is obtained by vacuum distillation. The above methods have been industrialized, but the first three methods have high production costs and poor product quality, so they are gradually replaced by the fourth method. 5. Propylene oxidation and carbon dioxide synthesis method. This method is a synthesis method developed in the laboratory in recent years.

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