Micro-interface preparation system and method of cyclic carbonate

Abstract

The invention provides a micro-interface preparation system and method of cyclic carbonate. The micro-interface preparation system comprises a stirring kettle and a carboxylation reaction kettle; andthe stirring kettle and the carboxylation reaction kettle are both filled with an ionic liquid catalyst; a micro-interface unit is arranged on the side face of the stirring kettle and composed of a plurality of external micro-interface generators; carbon dioxide is introduced into a main pipeline of the micro-interface unit, and at the same time is connected with two branch pipelines, namely, an oxidizing agent conveying pipeline and an olefin conveying pipeline, and the carbon dioxide is led into the micro-interface unit from a gas source conveying pipeline. And the carbon dioxide, an oxidizing agent and olefin enter the micro-interface unit, so that the carbon dioxide gas can be crushed into micron-grade micro-bubbles. According to the micro-interface preparation system, the phase boundary mass transfer area between carbon dioxide and cyclic carbonate generated in situ in a carboxylation reaction process is increased, sufficient mixing is conducted, and then the carboxylation reaction is conducted.

Description

Technical field[0001]The invention relates to the field of preparation of cyclic carbonates, and in particular to a system and method for preparing micro-interfaces of cyclic carbonates.Background technique[0002]Cyclic carbonate is an important chemical product. Cyclic carbonate has a wide range of applications in the fields of organic synthesis intermediates, polar aprotic solvents, lithium ion battery electrolytes, and polymer monomers. The industrial synthesis of cyclic carbonate is by epoxy compound and carbon dioxide carboxylation method. The process uses metal halides and ammonium salts as catalysts, and realizes the synthesis of cyclic carbonates from epoxy compounds and carbon dioxide at a pressure of 2.0-5.0 MPa and a temperature of 100-150°C.[0003]However, most epoxy compounds are toxic and may cause cancer. Compared with epoxy compounds, olefins have a wider range of sources, are cheaper and less toxic. Alkenes can be prepared by epoxidation reaction. Using olefin and car...

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Problems solved by technology

[0006] The first object of the present invention is to provide a micro-interface preparation system for cyclic carbonates. The micro-interface preparation system is based on the micro-interface reaction enhancement technology, and the micro-interface generator efficiently breaks carbon dioxide into micron-sized bubbles and disperses them into the liquid A micro-interface system is formed in the raw material to increase the gas-liquid phase interface area in the carboxylation reactor by tens of times, and greatly increase the mass transfer rate from the gas phase to the reaction liquid and the macroscopic hydrogenation rate, so as to realize the direct synthesis of rings from olefins and carbon dioxide. Shaped carbonate, and to solve the problem of low efficiency of the reaction system in the prior art because carbon dioxide and liquid raw materials cannot be fully mixed in the reactor

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