Method and device for integrated production of ethyl acetate through reactive distillation and penetration vaporization

Abstract

The invention provides a method for integrated production of ethyl acetate through reactive distillation and penetration vaporization. The whole tower of a reactive distillation tower is divided intoa distillation section and a reactive distillation section; acetic acid is fed from the top of the reactive distillation section; ethyl alcohol is fed from a tower kettle bottom reboiler; no extract is obtained at the tower kettle; a stream of liquid phase mainly containing water is extracted from the lateral line of the distillation section, and is moved out of the system. Tower top extracts enter a penetration vaporization membrane assembly; water permeates to pass through the membrane; remained ethyl acetate is the product. One part of water generated by esterification reaction is extractedfrom the lateral line; one part of the water is discharged out from the membrane assembly; the water is timely discharged out of the system in the two modes; the proceeding of the esterification reaction is promoted. Compared with a traditional process, the process has the advantages that the flow process is simple; the number of equipment is small; the energy consumption is low; entrainers or extracting agents are not introduced.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a new production process of ethyl acetate, in particular to a method and a device for producing ethyl acetate by using acetic acid and ethanol as raw materials through a new process integrating rectification with side line reaction and pervaporation. Background technique [0002] The process of preparing ethyl acetate by acetic acid esterification is to send a certain proportion of acetic acid and ethanol into the esterification reactor, use sulfuric acid or solid acid as a catalyst, carry out esterification reaction in the esterification reactor, and then separate to obtain ethyl acetate ester products. The outlet of the reactor generally obtains a crude ester product composed of ethyl acetate, ethanol and water, and there is a complex azeotropic phenomenon in this ternary system. It is necessary to adopt special distillation methods such as azeotropic distillation, extractive di...

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Problems solved by technology

[0009] Aiming at the disadvantages of complicated rectification and separation process and high energy consumption in the production of ethyl acetate by acetic esterification, as well as the low conversion rate of the integrated process of reactive distillation and pervaporation, large product loss and inability to process the crude ester in one step etc., the present invention provides a process for the integrated production of ethyl acetate with side line reactive distillation and pervaporation without the introduction of extractant or entrainer, the present invention provides a low energy consumption, simple process, and the process of producing ethyl acetate through reactive distillation column side line and pervaporation The membrane module removes water in time to promote the positive direction of the reaction. It is not necessary to circulate the product ethyl acetate as a water-carrying agent back to the reactive distillation column to increase the circulation stream and energy consumption, while ensuring that the molar fraction of the ethyl acetate product reaches 99.0 %above

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