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A kind of method for synthesizing acetic acid by carbonylation of methanol at low pressure

A technology of chemical synthesis and methanol, which is applied in the field of acetic acid synthesis, can solve the problems of high steam efficiency, unfavorable market competition, and high production cost of acetic acid, and achieve the effects of saving energy, saving steam consumption, and reducing ineffective cycles

Active Publication Date: 2021-12-10
PUJING CHEM IND SHA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional rhodium process requires high water as a catalyst stabilizer. Generally, the water in the reaction solution is 9-14%. When the water in the reaction solution is high, the steam effect of subsequent rectification will be high. Traditional acetic acid consumes steam At 1.5-1.8t / t acetic acid, large steam consumption leads to high production cost of acetic acid, which is not conducive to market competition

Method used

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  • A kind of method for synthesizing acetic acid by carbonylation of methanol at low pressure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Method for synthesizing acetic acid with low pressure methanol carbonylation, figure 1 As shown, including the following steps:

[0052] (1) In the presence of a catalyst, methanol and CO are introduced into the non-agitating reactor 1 to carry out the carbonylation reaction, and the mixed reactor 1 used is used as a self-transformed cycle mixing system, methanol and liquid phase components in the non-stirring reactor. External mixing forms an external mixture into the reactor, the mixed liquid phase component is obtained, and the methanol feed is also warmed up, and the purpose of advance preheating in advance; CO uses the feed to be fed and externally The mixture was energized in a different angle into the non-stirred reactor, so that the mixture entered the reactor, and the effect of the agitator was reached, so it was not necessary to use mechanical stirring or other stirring, thereby saving energy. The reaction liquid in the non-agitating reactor 1 includes the followi...

Embodiment 2

[0058] Method for synthesizing acetic acid with low pressure methanol carbonylation, figure 1 As shown, including the following steps:

[0059] (1) In the presence of a catalyst, methanol and CO are introduced into the non-agitating reactor 1 to carry out the carbonylation reaction, and the mixed reactor 1 used is used as a self-transformed cycle mixing system, methanol and liquid phase components in the non-stirring reactor. External mixing forms an external mixture into the reactor, the mixed liquid phase component is obtained, and the methanol feed is also warmed up, and the purpose of advance preheating in advance; CO uses the feed to be fed and externally The mixture was energized in a different angle into the non-stirred reactor, so that the mixture entered the reactor, and the effect of the agitator was reached, so it was not necessary to use mechanical stirring or other stirring, thereby saving energy. The reaction liquid in the non-agitating reactor 1 includes the followi...

Embodiment 3

[0065] Method for synthesizing acetic acid with low pressure methanol carbonylation, figure 1 As shown, including the following steps:

[0066] (1) In the presence of a catalyst, methanol and CO are introduced into the non-agitating reactor 1 to carry out the carbonylation reaction, and the mixed reactor 1 used is used as a self-transformed cycle mixing system, methanol and liquid phase components in the non-stirring reactor. External mixing forms an external mixture into the reactor, the mixed liquid phase component is obtained, and the methanol feed is also warmed up, and the purpose of advance preheating in advance; CO uses the feed to be fed and externally The mixture was energized in a different angle into the non-stirred reactor, so that the mixture entered the reactor, and the effect of the agitator was reached, so it was not necessary to use mechanical stirring or other stirring, thereby saving energy. The reaction liquid in the non-agitating reactor 1 includes the followi...

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Abstract

The invention relates to a method for synthesizing acetic acid by carbonylation of methanol at low pressure. (1) In the presence of a catalyst, feed methanol and CO into a non-stirring reactor for carbonylation reaction, and feed the liquid phase part in the middle of the non-stirring reactor into The flash evaporator performs flash evaporation to separate the liquid phase components and gas phase components; (2) The liquid phase components exchange heat with the mother liquid flash heat exchanger, and perform secondary flash evaporation after heating to obtain the secondary liquid phase components (3) Send the separated primary gas phase and secondary gas phase components to the catalyst trap, capture and recover the catalyst and return it to the flasher, and the gas phase components enter the light fraction rectification tower Carry out rectification separation in, obtain light component and heavy component; (4) return the liquid phase component in step (1), (2) to react without stirring reactor; (5) in step (3) The heavy component is sent to the heavy component rectification column for rectification and separation to obtain the acetic acid product. The invention utilizes self-reaction heat to carry out deep separation of the reaction liquid, reduces ineffective circulation, and saves power consumption and steam consumption.

Description

Technical field [0001] The present invention relates to a method of synthesizing acetic acid, and more particularly to a method of lactating a low pressure methanol carbonylation synthetic acetic acid. Background technique [0002] Acetic acid is one of the important organic chemical raw materials, mainly used to produce vinyl acetate, acetic anhydride, acetate, acetate, benzoic acid, chloroacetic acid, and the like can be widely used in chemical, light industry, textile, medicine, Printing and dyeing and other fields. The main method of producing acetic acid has acetaldehyde oxidation, olefin direct oxidation and methanol carbonylation method. Among them, the methanol carbonylation method has the advantages of high methanol conversion, the third by-product, and gradually become one of the main methods of producing acetic acid. [0003] The process of methanol carbonylation to produce acetic acid mainly includes both CO gas and acetic acid production. Producing Co as a raw materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/08C07C51/12C07C51/44
CPCC07C51/12C07C51/44C07C53/08
Inventor 毕永胜潘科覃建华王学珍鲁文质纪海霞
Owner PUJING CHEM IND SHA
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