A high-efficiency gas-liquid reactor and its application in the esterification reaction of ethylene oxide and carbon dioxide

Abstract

The invention belongs to the field of chemical engineering and particularly relates to an efficient gas-liquid reaction kettle. Through the reaction kettle, the concentration gradient of a gas phase and a liquid phase in the reaction kettle can be effectively reduced, and all material components tend to be identical in staying time in the reaction kettle. The reaction kettle is provided with a stirring device, baffle plates, cooling fins, a spiral gas distributor and a liquid phase feeding nozzle, the stirring device is composed of a motor, a stirring shaft and stirring blades, and the stirring blades comprise the spiral blade and the long-strip-shaped blade. One or more gas phase feeding inlets are formed in the bottom of the reaction kettle, one or more liquid phase feeding inlets are formed in the lower part of the wall of the reaction kettle, meanwhile, the reaction kettle is provided with a pressure gauge and a thermocouple, and corresponding pipelines are each provided with a flowmeter and a control valve. Through the reaction kettle, the problems that the gas phase and the liquid phase are mixed unevenly, and staying time of materials is different are solved, meanwhile, the mixing effect of the materials is improved, a local sharp reaction is avoided, all the materials enter the reaction kettle to complete a reaction rapidly, and product quality is guaranteed.

Description

technical field [0001] The invention belongs to the field of chemical engineering, and relates to a strong exothermic chemical reaction kettle in the field of chemical engineering, in particular to a high-efficiency gas-liquid reaction kettle and its application in the esterification reaction of ethylene oxide and carbon dioxide. Background technique [0002] Ethylene carbonate (EC) is an excellent high-boiling point, high-polarity solvent and surfactant raw material. It can also be widely used as an additive in lithium battery electrolyte and fiber finishing agent. Raw materials are used to synthesize high value-added products, which have a wide range of uses. With the increasingly severe energy crisis and the intensification of global warming, the CO 2 research has become a hot topic. CO 2 The reaction with ethylene oxide (EO) to synthesize EC converts CO 2 As the basic raw material for the preparation of organic chemical products, it has dual meanings. This process is...

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Problems solved by technology

There are several disadvantages in the structure of ordinary reactors: (1) The mixing effect of gas-liquid two-phase materials in the reactor is poor, and it is easy to form a concentration gradient, which may even cause local reactions to produce by-products or affect product quality; The shape and position of the material, from a macro point of view, the material is mainly due to the rotation of the stirring shaft, resulting in different residence times for each material in the reaction, prone to side reactions or incomplete reactions of raw materials; (3) For strong exothermic reactions, the Ordinary reactors are not easy to control the uniform reaction temperature, lack of reasonable heat removal measures or accessories

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