Method for preparing ethylene carbonate through continuous heterogeneous catalysis and catalyst

Abstract

The invention relates to a continuous heterogeneous catalyst and a process for synthesizing ethylene carbonate through continuous heterogeneous catalysis. The ethylene carbonate is prepared through carrying out a catalytic addition reaction on a packed bed reactor device by taking ethylene oxide and carbon dioxide as raw materials and taking a novel functional ionic liquid polymer adsorbed on an inorganic particle as a solid catalyst. The catalyst is prepared by stirring and coating a functional imidazolium ionic liquid polymer on an inorganic carrier. The ethylene carbonate is prepared by mixing ethylene oxide and the carbon dioxide by using nitrogen gas as carrier gas in the packed bed reactor device and carrying out a cyclic addition reaction under the action of the catalyst, wherein the reaction pressure is 1.0-6.0MPa, the reaction temperature is 80-150 DEG C, and the reaction time is 1-6h. The continuous heterogeneous catalyst and the process for synthesizing ethylene carbonate through continuous heterogeneous catalysis have the advantages that the method with a continuous process is simple in operation, low in cost, free of separation and distillation and suitable for large-scale industrial production; and the catalyst has high activity, low loss, high ethylene oxide conversion ratio up to 97% and high electivity up to 98%.

Description

technical field [0001] The invention relates to a method for preparing ethylene carbonate by continuous heterogeneous catalysis, especially after mixing ethylene oxide and carbon dioxide gas as raw materials, passing through a fixed-bed micro-reaction device coated with functional imidazole ionic liquid polymer Inorganic particle catalyst for continuous production of ethylene carbonate products. Background technique [0002] Ethylene carbonate (EC) is an organic solvent and surfactant raw material with wide application and excellent performance. It can be used as an intermediate in organic synthesis, and can also be used as a raw material for the synthesis of furazolidone, water glass-based slurry, fiber finishing agent and High-performance lithium battery electrolyte, etc. (Zhang Yubao, Lin Qingsong Properties and applications of ethylene carbonate [J]. Chemical World, 1998, (1): 10-12; World Fine Chemicals Handbook of Science and Technology Information Research Institute o...

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Problems solved by technology

[0009] In the prior art, the addition reaction of ethylene oxide and carbon dioxide is used to prepare ethylene carbonate, all of which are batch operations and the cost of catalyst consumption is too high; the use of homogeneous catalysts to catalyze the synthesis of ethylene carbonate has the problem of separating the catalyst from the product , thereby deactivating the catalyst

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