Production and manufacturing method of chloroethylene carbonate

Abstract

The invention belongs to the technical field of chloroethylene carbonate synthesis, and particularly relates to a production and manufacturing method of chloroethylene carbonate. Ethylene carbonate is subjected to melting treatment and then introduced into a reaction kettle, liquid chlorine is vaporized through a vaporizer to obtain chlorine, the chlorine is mixed with nitrogen to obtain a chlorine and nitrogen mixed gas, the chlorine and nitrogen mixed gas is introduced into the reaction kettle, and the saturated vapor pressure of hydrogen chloride is reduced through nitrogen partial pressure; the production of side reactions such as polymerization, decomposition, addition and the like in the reaction kettle is inhibited, the purity of the chloroethylene carbonate is effectively improved, the quality of the chloroethylene carbonate product and the partial pressure of nitrogen are ensured, the stability of the production process is improved, and safe production is realized.

Description

technical field [0001] The invention relates to the technical field of chloroethylene carbonate synthesis, in particular to a production method of chloroethylene carbonate. Background technique [0002] Chloroethylene carbonate is mainly used in the preparation of lithium battery electrolyte fluoroethylene carbonate and vinylene carbonate. High-purity chloroethylene carbonate can also be directly used as a flame retardant additive for lithium battery electrolyte to improve the cycle performance of lithium battery electrolyte and increase the service life. Chloroethylene carbonate has a variety of synthesis techniques. The traditional technique uses ethylene carbonate as a raw material, sulfuryl chloride as a chlorinating agent, and is prepared under the trigger of azobisisobutyronitrile (AIBN). The reaction equation is: The process of sulfuryl chloride is liquid, easy to use, and the reaction is relatively mild and stable, but a large amount of sulfur dioxide gas by-produc...

AI Technical Summary

Problems solved by technology

Chloroethylene carbonate has a variety of synthesis techniques. The traditional technique uses ethylene carbonate as a raw material, sulfuryl chloride as a chlorinating agent, and is prepared under the trigger of azobisisobutyronitrile (AIBN). The reaction equation is: The process of sulfuryl chloride is liquid, easy to use, and the reaction is relatively mild and stable, but a large amount of sulfur dioxide gas by-product is difficult to handle, and has been gradually eliminated

[0003] The Chinese patent with the application number 201910796829.X discloses a chlorination process of ethylene carbonate. By using a dispersant and ultraviolet light coupling reaction, it avoids the increase of side reactions caused by the uneven distribution of chlorine gas caused by the use of ultraviolet light. The problem of fluctuations in the yield of ethylene carbonate, the content of chloroethylene carbonate was increased, but the waste gas generated by the reaction was not treated

[0004] The Chinese patent with the application number 201911027346.X discloses a preparation method of chloroethylene carbonate using a new type of initiator, using ethylene carbonate and chlorine as reaction raw materials, using benzoyl peroxide and phthalic acid bicyclic The mixture of hexyl esters is used as a new type of initiator. Under the action of the new type of initiator, it reacts to generate chloroethylene carbonate. The hydrogen chloride and chlorine gas tail gas produced by the chlorination reaction are absorbed with water and lye respectively to generate by-products with a content greater than 30% concentrated hydrochloric acid and content More than 10% sodium hypochlorite, but the purity of chloroethylene carbonate will decrease when it is stored for a long time or heated, and the storage conditions of chloroethylene carbonate are not limited in this scheme

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