Method of one-step synthesis of asymmetric carbonate and co-production of 1,2-propylene glycol by using propylene oxide

A propylene oxide, asymmetric technology, used in the preparation of carbon dioxide or inorganic carbonate, chemical instruments and methods, products, etc., can solve the problem of increased operating costs, low reactant conversion and product selectivity, and high energy consumption. question
CN108129262AInactive Publication Date: 2018-06-08SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
Publication Date
2018-06-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method of one-step synthesis of asymmetric carbonate and co-production of 1,2-propylene glycol by using propylene oxide, and relates to the method for synthesizing the asymmetric carbonate. A high-efficiency neutral catalyst with a composite pore structure is used for the one-step synthesis of the asymmetric carbonate by using the propylene oxide, carbon dioxide, methanoland various alcohols. The selectivity of the asymmetric carbonate in the crude product obtained by a reaction can be up to 70%. The by-products, dimethyl carbonate and dialkyl carbonates can be directly separated out as products, and can be recycled for continued reaction for generating the asymmetric carbonate; and the by-product 1,2-propylene glycol can be separated out through simple distillation as a bulk raw material. When the molar ratio of the propylene oxide to the carbon dioxide to the methanol to the other alcohols is 1:1:3:2, the reaction pressure is 5 MPa, the reaction temperatureis 100 DEG C, and the space velocity is 5 hours<-1>, the catalyst is not deactivated and has good stability after being used for 5000 hours. The whole reaction process is clean, efficient and free ofpollution, and no waste is generated.
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Description

technical field

[0001] The invention relates to a method for synthesizing an asymmetric carbonate ester, in particular to a method for synthesizing an asymmetric carbonate ester from propylene oxide in one step and co-producing 1,2-propanediol. Background technique

[0002] Methyl Ethyl Carbonate (MPC for short), molecular formula: C 4 h 8 o 3 , colorless transparent liquid, density 1.01 g / mL, melting point -55 ° C, boiling point 107 ° C, flammable, can be mixed with organic solvents such as alcohols, ketones, esters in any proportion, is an excellent solvent, ethyl methyl carbonate is due to Its molecular structure has methyl and ethyl groups at the same time, so it has the characteristics of dimethyl carbonate and diethyl carbonate, and can be used as some special organic synthesis reagents, and it is also a solvent for special fragrances.

[0003] Due to the low viscosity, large dielectric constant and strong solubility of lithium salts, ethyl methyl carbonate is an ex...

Claims

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