Method and apparatus for synthesizing isopropyl acetate by differential thermal coupling reactive distillation

A technology coupled with isopropyl acetate and differential pressure heat, applied in separation methods, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of high energy consumption in the rectification process, improve the total conversion rate, and accelerate the reaction rate , the effect of improving thermal efficiency

Pending Publication Date: 2018-04-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although reactive distillation technology is gradually mature and its industrial application is gradually expanding, the high energy consumption of the rectification process has always been a concern of industrial production and researchers.

Method used

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  • Method and apparatus for synthesizing isopropyl acetate by differential thermal coupling reactive distillation
  • Method and apparatus for synthesizing isopropyl acetate by differential thermal coupling reactive distillation
  • Method and apparatus for synthesizing isopropyl acetate by differential thermal coupling reactive distillation

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Embodiment 1

[0030] The differential pressure thermal coupling reaction rectification technological process adopted in embodiment 1 is: raw material isopropanol and acetic acid are mixed with the overhead flow from the product refining tower III in the feed mixer MIX, and then enter the filled acidic cation exchange resin from the bottom of the tower The catalyst is fully reacted and preliminarily separated in the low-pressure reaction section tower I of the catalyst. The gas phase at the top of tower I in the low-pressure reaction section is pressurized and heated by the compressor COMPR, and then enters the bottom tray of tower II in the high-pressure rectification section. The azeotropic mixture of alcohol-water, after extracting the azeotrope, first exchanges heat with the bottom stream of the low-pressure reaction section column I, and then condenses to 50°C through the condenser E2, then enters the phase separator DEC, and separates in the phase separator DEC into an organic phase an...

Embodiment 2

[0039] The differential pressure thermal coupling reaction rectification technological process adopted in embodiment 2 is: raw material isopropanol and acetic acid are mixed with the overhead flow from the product refining tower III in the feed mixer MIX, and then enter the filled acidic cation exchange resin from the bottom of the tower The catalyst is fully reacted and preliminarily separated in the low-pressure reaction section tower I of the catalyst. The gas phase at the top of tower I in the low-pressure reaction section is pressurized and heated by the compressor COMPR, and then enters the bottom tray of tower II in the high-pressure rectification section. The azeotropic mixture of alcohol-water, after extracting the azeotrope, first exchanges heat with the bottom stream of the low-pressure reaction section column I, and then condenses to 50°C through the condenser E2, then enters the phase separator DEC, and separates in the phase separator DEC into an organic phase an...

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Abstract

The invention relates to a method and apparatus for synthesizing isopropyl acetate by differential thermal coupling reactive distillation. The apparatus comprises: a feeding mixer, a low-pressure reaction column, a high-pressure distillation column, a product refining column, a phase splitter, a separator, a compressor, a thermal coupling heat exchanger, a condenser and an auxiliary reboiler. Theapparatus for synthesizing isopropyl acetate by differential thermal coupling reactive distillation allows synthesis of high-purity isopropyl acetate during distillation process; a traditional reactive distillation column is split into the high-pressure distillation column and the low-pressure reaction column, high-temperature steam at the top of the high-pressure distillation column is used to heat the reboiler of the low-pressure reaction column, the two columns share one heat exchanger, heat of the top steam of the high-pressure distillation column is made full use, and heat efficiency of the process is improved. By synthesizing isopropyl acetate via the differential thermal coupling reactive distillation process, esterification, distillation separation and thermal coupling are integrated; material that is not fully reacted flows back for reuse, so that total conversion rate of a reactant is increased.

Description

technical field [0001] The invention belongs to the technical field of ester synthesis and chemical energy conservation, and in particular relates to a method and a device for synthesizing isopropyl acetate by using a differential pressure thermal coupling reaction distillation process. Background technique [0002] As an important carboxylic acid chemical product, isopropyl acetate can be widely used in organic solvents, drug extractants, paints, medicines, pesticide industries, high-grade inks, leather, plastics, spices, etc. due to its excellent solubility. [0003] The industrial production of isopropyl acetate mainly adopts acetic acid and isopropanol esterification method [CN1446791A] at present, ethyl acetate transesterification method [CN1785955A] and acetic acid and propylene direct reaction synthesis method [CN1260203C]. According to the mode of operation, the synthesis of isopropyl acetate can be divided into batch operation and continuous synthesis. At present, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/08C07C67/54C07C69/14B01J8/00B01D3/14
CPCB01D3/009B01D3/14B01J8/008C07C67/08C07C67/54C07C69/14Y02P20/10
Inventor 李军赵天龙马占华周昊李如春孙兰义
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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