Method for producing ethyl acetate by using entrainer

Abstract

The invention discloses a method for producing ethyl acetate by using an entrainer. The method comprises the following steps: the entrainer and concentrated sulfuric acid used as a catalyst are added into an esterification kettle at one time, and supplemented intermittently; when acetic acid and ethanol used as raw materials are processed by a side line stream heat exchanger, a preheater, an esterification reboiler, the esterification kettle, a gas-liquid separator, an esterification column, a condenser and a phase separator, the mixed liquor obtained from the side stream of the esterification column exchanges heat with the raw materials and enters a cooler to be cooled to 40 DEG C, all or part of the organic phase ( mainly containing the entrainer) obtained from the phase separator by phase separation returns to the circulating water entrainment of the esterification column, and the ethyl acetate is obtained from the kettle of the stripping tower, wherein the entrainer is isobutyl propionate, propyl isobutyrate, or the mixture of isobutyl propionate and propyl isobutyrate. In the method for producing ethyl acetate by using an entrainer, the entrainer has the advantages of large water entrainment quantity, small use amount and capability of cyclic utilization, thereby reducing the energy consumption and material consumption in the production process, expanding the production capacity and being beneficial to the improvement of the industrial production technology.

Description

technical field [0001] The present invention relates to a kind of production method of ethyl acetate, particularly a kind of method that uses entrainer to produce ethyl acetate. Background technique [0002] my country's industrial energy consumption accounts for more than 50% of the total energy consumption of the whole society, and the energy consumption per unit product of many energy-intensive industrial processes is about 30-90% higher than the international advanced level. Ethyl acetate is an important chemical solvent and basic organic chemical raw material, widely used in industrial solvents, adhesives, extractants for the production of medicines, organic acids and other products, raw materials for spices, etc. The production of solvents such as acetate is mainly a process industry with high energy consumption and high material consumption based on thermal processing processes such as reaction and separation. Most of the existing production technologies of ethyl ace...

AI Technical Summary

Problems solved by technology

The bottleneck of the traditional ethyl acetate production process lies in the insufficient strengthening of core processes such as esterification reaction and rectification separation. The molar ratio of the binary azeotrope formed by ethyl acetate and water does not match the ratio of esterification reaction. A large amount of reaction by-product water stays in the reaction system, which restricts the forward direction of the esterification reaction, and requires a large amount of crude ester as an entrainer to reflux the enriched water in the entrainment system, resulting in a large reflux ratio of the esterification tower and high energy consumption. High, which greatly limits the production capacity of the device

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