Method for synthesizing mixed ester through catalyst distillation

Abstract

The invention discloses a method for synthesizing mixed ester through catalyst distillation. The method comprises the following steps: by taking ethanol, n-butyl alcohol and acetic acid as raw materials, a strong acid cation exchange resin as a catalyst and a catalyst distillation tower as a reactor, performing a catalyst distillation backflow reaction, and finally performing phase separation, thereby obtaining mixed ester of ethyl acetate and butyl acetate. According to the method, the intense water carrying power of the butyl acetate is utilized, azeotrope is prepared from the butyl acetate,butanol and water, and water generated from reactions is completely carried out from a tower top. Therefore, the conversion rate of alcohol reactants and the content of the acetic acid in the catalyst distillation tower can be increased, and the influence of product water to the reaction process in the tower is also eliminated. A tower top product is generally an ester-water mixture and comprisesa very small amount of acetic acid, so that the later purification difficulty of the ethyl acetate and the butyl acetate is greatly reduced, the production procedures are simplified, the production efficiency is improved, and the energy consumption is reduced.

Description

technical field [0001] The invention belongs to the field of organic chemical synthesis, in particular to a method for synthesizing mixed esters by catalytic distillation, in particular to a method for simultaneously synthesizing ethyl acetate and butyl acetate by catalytic distillation. Background technique [0002] Catalytic distillation (CD, catalytic distillation) technology is a chemical process in which heterogeneous catalytic reaction and distillation separation are coupled in the same equipment. This process strengthens both chemical reaction and distillation separation. As a heterogeneous reaction distillation process, the existing catalyst for catalytic distillation adopts solid catalyst and fills it into the tower in a certain form, which can play the double role of catalysis and packing. In the process of catalytic distillation technology, the reaction product can be separated from the reaction area in time. According to the principle of reversible reaction, the ...

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Problems solved by technology

[0008] (1) In terms of catalyst components, the catalyst used is required to be a solid catalyst and is granular. It is difficult to process the specifications and performance of the catalyst components into a consistent type, and it is difficult to unify the amount of catalyst, the performance of the packing and the void ratio in the tower.

[0009] (2) The material wrapping the catalyst component is easy to corrode, the corrosion problem is difficult to solve, and the catalyst packing is difficult to replace

[0010] (3) Due to the formation of multiple azeotropes in the esterification reaction system, the reaction products cannot all enter the top or bottom of the tower, and the technical advantages of catalytic distillation cannot be well utilized

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