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Method for synthesizing acetic acid through carbonylation of low-pressure methanol

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

Active Publication Date: 2020-09-11
PUJING CHEM IND SHA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for synthesizing acetic acid through carbonylation of low-pressure methanol

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Embodiment 1

[0051] A method for the synthesis of acetic acid by carbonylation of methanol at low pressure, its technological process is as follows figure 1 shown, including the following steps:

[0052] (1) In the presence of a catalyst, feed methanol and CO into the non-stirred reactor 1 for carbonylation reaction. The non-stirred reactor 1 used adopts a self-operated circulation mixing system, and the methanol and liquid phase components are separated in the non-stirred reactor. After being mixed externally to form an external mixed liquid, it enters the reactor. After mixing, the temperature of the liquid phase components is lowered, and the temperature of the methanol feed is also raised, which achieves the purpose of preheating the feed in advance; The mixed liquid enters the non-stirred reactor at different angles, and the mixed liquid is stirred after entering the reactor to achieve the effect of the agitator, so that mechanical stirring or other stirring methods are not required, ...

Embodiment 2

[0058] A method for the synthesis of acetic acid by carbonylation of methanol at low pressure, its technological process is as follows figure 1 shown, including the following steps:

[0059] (1) In the presence of a catalyst, feed methanol and CO into the non-stirred reactor 1 for carbonylation reaction. The non-stirred reactor 1 used adopts a self-operated circulation mixing system, and the methanol and liquid phase components are separated in the non-stirred reactor. After being mixed externally to form an external mixed liquid, it enters the reactor. After mixing, the temperature of the liquid phase components is lowered, and the temperature of the methanol feed is also raised, which achieves the purpose of preheating the feed in advance; The mixed liquid enters the non-stirred reactor at different angles, and the mixed liquid is stirred after entering the reactor to achieve the effect of the agitator, so that mechanical stirring or other stirring methods are not required, ...

Embodiment 3

[0065] A method for the synthesis of acetic acid by carbonylation of methanol at low pressure, its technological process is as follows figure 1 shown, including the following steps:

[0066] (1) In the presence of a catalyst, feed methanol and CO into the non-stirred reactor 1 for carbonylation reaction. The non-stirred reactor 1 used adopts a self-operated circulation mixing system, and the methanol and liquid phase components are separated in the non-stirred reactor. After being mixed externally to form an external mixed liquid, it enters the reactor. After mixing, the temperature of the liquid phase components is lowered, and the temperature of the methanol feed is also raised, which achieves the purpose of preheating the feed in advance; The mixed liquid enters the non-stirred reactor at different angles, and the mixed liquid is stirred after entering the reactor to achieve the effect of the agitator, so that mechanical stirring or other stirring methods are not required, ...

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Abstract

The invention relates to a method for synthesizing acetic acid by carbonylation of low-pressure methanol. The method comprises the following steps: (1) in the presence of a catalyst, introducing methanol and CO into a non-stirring reactor, carrying out a carbonylation reaction, feeding a liquid-phase part in the middle of the non-stirring reactor into a flash evaporator, carrying out flash evaporation, and separating to obtain a liquid-phase component and a gas-phase component; (2) carrying out heat exchange on the liquid-phase component and a mother liquor flash evaporation heat exchanger, carrying out secondary flash evaporation after heating, and separating to obtain a secondary liquid-phase component and a secondary gas-phase component; (3) feeding the separated primary gas-phase and secondary gas-phase components into a catalyst catcher, returning the caught and recovered catalyst into the flash evaporator, and feeding the gas-phase component into a light-component rectifying tower, and rectifying and separating to obtain a light component and a heavy component; (4) sending the liquid-phase components in steps (1) and (2) back to the non-stirring reactor, and reacting; and (5)feeding the heavy component in step (3) into a heavy component rectifying tower, and performing rectification separation to obtain the acetic acid product. Reaction heat is utilized to deeply separate the reaction liquid, invalid circulation is reduced, and power consumption and steam consumption are saved.

Description

technical field [0001] The invention relates to a method for synthesizing acetic acid, in particular to a method for synthesizing acetic acid by carbonylation of methanol at a low pressure. Background technique [0002] Acetic acid is one of the important organic chemical raw materials. It is mainly used in the production of vinyl acetate, acetic anhydride, cellulose acetate, acetates, terephthalic acid, chloroacetic acid, etc. It can be widely used in chemical industry, light industry, textile, medicine, Printing and dyeing and other fields. At present, the main methods of producing acetic acid are acetaldehyde oxidation, olefin direct oxidation and methanol carbonylation. Among them, the methanol carbonylation method has the advantages of high methanol conversion rate and small by-products, and has gradually become one of the main methods for the production of acetic acid. [0003] The process of methanol carbonylation to produce acetic acid mainly includes two parts: CO...

Claims

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Application Information

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Patent Type & Authority Applications(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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