An external circulation reaction device suitable for hydrogenation exothermic reaction

Abstract

An external circulation reaction device suitable for hydrogenation exothermic reaction is mainly composed of a primary hydrogenation reactor, a secondary hydrogenation reactor, a hydrogen circulation loop and a liquid circulation loop. The liquid circulation loop in the reaction device mixes a part of the solution after the reaction with fresh raw material liquid to reduce the concentration of the raw material in the reactor, alleviate the bed temperature rise caused by the exothermic effect of hydrogenation, and effectively control the temperature in the primary hydrogenation reactor. The first-stage hydrogenation reactor adopts a flow mode in which the raw material liquid and hydrogen flow side by side, with the liquid phase as the continuous phase, and the catalyst is soaked in the reaction liquid, so as to realize the constant reaction temperature of the catalyst bed and avoid localized reaction sites on the surface of the catalyst. If the temperature is too high, the polymerization of organic matter on the surface of the catalyst can be effectively inhibited, and the amount of carbon on the surface of the catalyst is small, which significantly prolongs the service life of the catalyst. The external circulation reaction device of the present invention is suitable for the continuous production of succinic anhydride by catalytic hydrogenation of maleic anhydride and the hydrogenation of butynediol to produce 1,4-butanediol.

Description

technical field [0001] The invention relates to an external circulation reaction device with a liquid circulation loop and a gas circulation loop, which is suitable for hydrogenation exothermic reaction, specifically an external circulation hydrogenation reactor that can control the reaction temperature balance and has no hot spots at the same time . Background technique [0002] Polybutylene succinate (PBS), produced by esterification and polycondensation of succinic acid and 1,4-butanediol, is a leader in biodegradable plastic materials and has a wide range of uses. It can be used in bacteria or enzymes Under the action of the environment, it will eventually degrade into substances such as carbon dioxide and water, which is harmless to the environment. In addition, PBS has a high melting point and good performance. It is expected to replace general-purpose polyethylene or polypropylene and enter the field of general-purpose plastics to alleviate environmental pollution ca...

AI Technical Summary

Problems solved by technology

[0005] For the hydrogenation of maleic anhydride to produce succinic anhydride and the hydrogenation of 1,4-butynediol to produce 1,4-butanediol are strong exothermic reactions. When using a fixed bed as a reactor for continuous production, the hydrogenation reaction temperature is not easy control and there are hot spots, and the reactants are easy to coke and cover the surface of the catalyst, causing the problem of catalyst deactivation. The purpose of the present invention is to provide a method that can effectively control the reaction temperature, eliminate hot spots and coke in the reactor at the same time, and realize succinic anhydride and An external circulation reaction device suitable for hydrogenation exothermic reaction for continuous large-scale production of 1,4-butanediol

Images