Method for manufacturing cyclic carbonate

Abstract

Provided is a method for manufacturing a cyclic carbonate which is a method for manufacturing a cyclic carbonate by reacting epoxide and carbon dioxide, the method being capable of efficiently manufacturing a cyclic carbonate at a high conversion percentage and high yield, and in which degradation of the catalyst over time is inhibited and catalytic activity is unlikely to occur. A method for manufacturing a cyclic carbonate for reacting epoxide and carbon dioxide in the presence of a quaternary onium salt selected from quaternary ammonium salt having a halogenated anion as a counter ion and a quarternary phosphonium salt having a halogenated anion as a counter ion, or in the presence of a solid catalyst in which the quarternary onium salt has been immobilized on a carrier, wherein a halogenated organic containing at least one halogen atom in one molecule is added to the reaction system.

Description

technical field [0001] The present invention relates to a method for producing cyclic carbonates. Background technique [0002] Cyclic carbonates can be used as organic solvents, synthetic fiber processing agents, raw materials for pharmaceuticals, cosmetic additives, electrolyte solvents for lithium batteries, and are also used in the synthesis of alkylene glycols and dialkyl carbonates, etc. (Patent Document 1) , is one of the important compounds with a wide range of uses. [0003] Conventionally, this cyclic carbonate has been synthesized by reacting an epoxide with carbon dioxide in the presence of a homogeneous catalyst under appropriate pressure conditions. As such a homogeneous catalyst, halides such as alkali metals, quaternary ammonium salts, etc. have been known conventionally. Salt (Patent Document 2) is also used industrially. [0004] However, when such a homogeneous catalyst is used, separation operations such as distillation of the reaction mixture and the...

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Problems solved by technology

[0006] However, these heterogeneous catalysts have the problem that the immobilized quaternary The salt seeps out slowly during the reaction, so that the amount of catalyst participating in the reaction is substantially reduced, and the yield decreases over time

Especially when the above-mentioned catalyst is used in a continuous process, the catalyst needs to be frequently exchanged due to the deterioration of the catalyst, which cannot be fully satisfied in terms of production efficiency and catalyst cost.

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