Method for one-step synthesis of ethyl methyl carbonate from propylene oxide and co-production of 1,2-propanediol

A technology for methyl ethyl carbonate and propylene oxide, applied in the field of synthesizing methyl ethyl carbonate, can solve the problems of high energy consumption, increased operating cost, low reactant conversion rate and product selectivity, etc.
CN108164418AInactive Publication Date: 2018-06-15SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
Publication Date
2018-06-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for synthesizing ethyl methyl carbonate, and concretely relates to a method for one-step synthesis of ethyl methyl carbonate from propylene oxide and co-production of1,2-propanediol. An efficient alkaline catalyst having a compopsite pore structure is used in the one-step reaction of the propylene oxide, carbon dioxide, methanol and ethanol for synthesizing the ethyl methyl carbonate. A crude product obtained through the reaction contains dimethyl carbonate, ethyl methyl carbonate, diethyl carbonate and 1,2-propanediol, wherein the ethyl methyl carbonate selectivity reaches up to 70%. Byproducts dimethyl carbonate and diethyl carbonate can be directly separated as products, also can be recycled, and are continuously reacted to generate the ethyl methyl carbonate, and the product 1,2-propanediol can be separated through simple distillation as a popular raw material. The method has the advantages of cleanness, high efficiency, no pollution and no wastesin the whole reaction process. The catalyst is not inactive after being used at a molar ratio of the propylene oxide to the carbon dioxide to the methanol to the ethanol of 1:1:3:2 under a reaction pressure of 5 MPa at a reaction temperature of 100 DEG C under an air speed of 5 h<-1> for 5000 h, and has a good stability.
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Description

technical field

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

[0002] Methyl Ethyl Carbonate (MEC 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 excellent lithiu...

Claims

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