Synthesis method of vinylene carbonate for electrolyte

Abstract

The invention relates to the technical field of synthesis and purification of vinylene carbonate, and discloses a synthesis method of vinylene carbonate for electrolyte. The method specifically comprises the following steps: pumping raw materials ethylene carbonate and an initiator into a raw material preheater through a metering pump, introducing chlorine into a reactive distillation column from the bottom of the tower, reacting chlorine with ethylene carbonate in the reactive distillation column, enabling excessive chlorine and a product hydrogen chloride to enter a vacuum pump through a gas phase outlet of a condenser, and pumping chloroethylene carbonate into a vinylene carbonate synthesis kettle. According to the method, synthesis and rectification processes of the chloroethylene carbonate are integrated, synthesis and refining of the chloroethylene carbonate are carried out at the same time through the reactive distillation column, reaction heat released in the reaction process is used for self-rectification, the overall synthesis time is shortened, continuous production of chloroethylene carbonate is realized, material backmixing is effectively reduced, the main reaction selectivity is obviously improved, and the side reaction is reduced.

Description

technical field [0001] The invention relates to the technical field of vinylene carbonate synthesis, in particular to a method for synthesizing vinylene carbonate for electrolyte. Background technique [0002] Synthetic vinylene carbonate mainly has three technological routes, and every kind of technological route is all to be starting raw material with ethylene carbonate. Method 1: Using ethylene carbonate as a raw material, use chlorine gas to replace the hydrogen atoms on the ethylene carbonate to generate dichloroethylene carbonate, and then eliminate the chlorine to generate vinylene carbonate. Method 2: Using ethylene carbonate as a raw material, using sulfuryl chloride or chlorine gas as a chlorinating agent, replacing the hydrogen atoms on the ethylene carbonate to generate monochloroethylene carbonate, and then eliminating the chlorine to generate vinylene carbonate. Method 3: Using ethylene carbonate as raw material, directly carry out catalytic dehydrogenation to...

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Problems solved by technology

[0008] The synthesis process of the reactive distillation device used in the above-mentioned patent is divided into two steps. The first step is the synthesis of chloroethylene carbonate, and the second is the rectification of chloroethylene carbonate. Although the selectivity of the reaction is effectively improved, the To prevent the occurrence of side reactions, the reaction and rectification were realized in one device, but the continuous production of chloroethylene carbonate was not realized

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