Novel esterification pre-reactor

Abstract

The invention relates to a novel esterification pre-reactor, which comprises a pre-reactor shell, wherein a feed pipe and a liquid outlet which are inserted into the pre-reactor shell are formed in the upper end of the pre-reactor shell; an upper cover is positioned on the upper part of the pre-reactor shell; a motor for driving a shaft to rotate is fixedly arranged at the upper end of the upper cover; the shaft is inserted into the shell; a stable area in which a catalyst is settled is positioned below the upper cover; a diversion tube is arranged in the shell; film meshes for suspending the catalyst are arranged between two sides of the diversion tube and the pre-reactor shell respectively; an upper filter screen for blocking the catalyst is arranged outside the upper end of the diversion tube; and a lower filter screen is arranged at the bottom of the diversion tube. By the esterification pre-reactor, materials are in full contact with the catalyst, continuous production is realized, and the limit of reaction equilibrium is eliminated, so that the esterification pre-reactor has high reaction selectivity and conversion rate of products, the process production capacity and the purity of the products are improved, the reaction time can be shortened, and energy consumption and operating cost can also be reduced.

Description

technical field [0001] The invention relates to an esterification reactor, in particular to a novel esterification reaction preconditioner using a solid particle catalyst. Background technique [0002] Butyl acetate still adopts the traditional production process route using sulfuric acid as a catalyst in China. There are many shortcomings in this process, such as the use of highly corrosive and oxidizing concentrated sulfuric acid as a catalyst, equipment corrosion and side reactions are serious; It is carried out in a batch-type enamel kettle with low heat transfer efficiency, and the conversion rate per pass of the reaction is low; because the esterification of alcohol and acid is limited by the chemical balance, and the system contains azeotropes, the two-step process of reaction and separation is difficult, and the production The process is long; in addition, equipment investment and maintenance costs are high, energy consumption and operating costs are large, produ...

AI Technical Summary

Problems solved by technology

[0002] At present, butyl acetate still adopts the traditional production process route using sulfuric acid as a catalyst in China. There are many shortcomings in this process, such as the use of highly corrosive and oxidizing concentrated sulfuric acid as a catalyst, serious equipment corrosion and side reactions; It is carried out in a batch-type enamel kettle with low heat transfer efficiency, and the single-pass conversion rate of the reaction is low; because the esterification of alcohol and acid is limited by the chemical balance, and the system contains azeotropes, the two-step process of reaction and separation is difficult, and the production The process is long; in addition, equipment investment and maintenance costs are high, energy consumption and operating costs are large, product quality is poor, and the discharged waste liquid also affects and pollutes the environment

In order to overcome the shortcomings of sulfuric acid catalyst, a flexible process of using solid acid instead of sulfuric acid was proposed, and more researches were also carried out, but the catalytic effect was reduced due to the easy pulverization of the catalyst in the esterification kettle and the accumulation of impurities, making it difficult to industrialize

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