1,2-Propanediol is a chemical reagent, mixed with water and ethanol It is miscible with a variety of organic solvents and its chemical formula is C3H8O2. Under normal conditions, it is a colorless, viscous liquid, almost odorless, and smells slightly sweet. Propylene glycol can be used as a raw material for unsaturated polyester resin. It can be used as a wetting agent in combination with glycerin or sorbitol in cosmetics, toothpaste and soap. It is used as a moisturizing and leveling agent in hair dyes, as an antifreeze, and in cellophane, plasticizer and pharmaceutical industries.
Propylene carbonate (PC) is a widely used type of cyclic carbonate. It is a high-boiling point and highly polar organic solvent and fine chemical synthesis intermediate with excellent performance; propylene carbonate Ester is also a stable battery electrolyte that can withstand light, heat and chemical changes under harsh conditions; it is also a good solvent for extracting petroleum components, raw paint, plasticizers and other difficult-to-contain substances. It is used in the petrochemical industry and textile industry. It is well used in the printing and dyeing industry; at the same time, it is also a raw material for the production of dimethyl carbonate by transesterification.
1,2-Propylene glycol is an excellent raw material for the preparation of propylene carbonate:
Propylene glycol supply points out: the synthesis method of propylene carbonate can be divided into There are two categories based on 1,2-propanediol reaction and propylene oxide-based reaction. The subdivision mainly includes the phosgene method, transesterification method, chloropropanol method, propylene oxide and carbon dioxide synthesis method, propylene and carbon dioxide synthesis method and urea alcoholysis method.
Among them, the phosgene method and the CO2 and propylene oxide synthesis method are currently commonly used in domestic and foreign industries. However, the reaction conditions are harsh, the reaction exothermic is violent, the engine is prone to explosion, and the catalyst is not easy to separate, and the raw materials Propylene oxide relies on the alcoholysis of petroleum, urea and 1,2-propanediol to synthesize PC. It is currently a route of research and exploration at home and abroad. This process has the advantages of mild reaction conditions, safe operation, safe raw materials, and little negative impact on the environment. . The reaction of urea and 1,2-propylene glycol to synthesize PC can convert PG, a by-product in the production of dimethyl carbonate by transesterification, into its raw material PC, thereby realizing the recycling of PG, greatly reducing production costs and improving the utilization rate of raw materials. ; Moreover, the by-product ammonia can be used as a raw material for urea production, forming a green, economical and recyclable chemical production chain.
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