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Title:
METHOD FOR SYNTHESIZING ACETIC ACID BY LOW-PRESSURE METHANOL CARBONYLATION
Document Type and Number:
WIPO Patent Application WO/2021/047391
Kind Code:
A1
Abstract:
The present invention relates to a method for synthesizing acetic acid by low-pressure methanol carbonylation. The method comprises: (1) in the presence of a catalyst, introducing methanol and CO into a non-stir reactor to undergo a carbonylation reaction, and then feeding a liquid phase portion in a middle part of the non-stir reactor into a flash evaporator to undergo flash evaporation, thereby separating and obtaining a liquid phase component and a gas phase component; (2) performing heat exchange on the liquid phase component with a mother liquid flash evaporation heat exchanger, and once heated, performing secondary flash evaporation, thereby separating and obtaining a secondary liquid phase component and a secondary gas phase component; (3) feeding the separated and obtained primary gas phase and secondary gas phase components into a catalyst trap, returning the trapped and recovered catalyst back into the flash evaporator, and allowing the gas phase components to enter into a light component fractionating column to undergo fractionation, thereby obtaining light components and heavy components; (4) feeding the liquid phase components from steps (1) and (2) back into the non-stir reactor to undergo reaction; (5) feeding the heavy components from step (3) into a heavy component fractionating column to undergo fractionation, thereby obtaining an acetic acid product. The present invention utilizes self-produced reaction heat to perform advanced separation of a reaction liquid, reduces ineffective circulation, and lowers electricity consumption and steam consumption.

Inventors:
BI YONGSHENG (CN)
Application Number:
PCT/CN2020/111551
Publication Date:
March 18, 2021
Filing Date:
August 27, 2020
Export Citation:
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Assignee:
PUJING CHEMICAL IND CO LTD (CN)
International Classes:
C07C51/12; C07C53/08
Domestic Patent References:
WO2002068374A12002-09-06
WO2009134333A12009-11-05
Foreign References:
US6114576A2000-09-05
CN1757627A2006-04-12
CN103864595A2014-06-18
CN104250210A2014-12-31
CN104250209A2014-12-31
CN205164737U2016-04-20
Attorney, Agent or Firm:
SHANGHAI PATENT & TRADEMARK LAW OFFICE, LLC (CN)
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