1. The raw material propylene glycol of the phosgene method 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.
2. Transesterification method.
3. Chloropropanol method.
4. Synthesis of Propylene Oxide and Carbon Dioxide Carbon dioxide and propylene oxide react at 150-160°C and 5MPa to form propylene carbonate. The finished product is obtained by fractional distillation under reduced pressure. The above methods have all been industrialized, but the first three methods have higher production costs and poor product quality, so they are gradually replaced by the fourth method.
5. Propylene oxidation and carbon dioxide synthesis. This method is a synthetic method developed by the laboratory in recent years.