Method and apparatus for synthesizing acetic acid by methanol low-voltage carbonylation

A technology for chemical synthesis and methanol, applied in the field of low-pressure carbonylation of methanol to acetic acid, which can solve the problems of loss of catalytic activity and achieve the effects of reducing mist entrainment, reducing production costs, and reducing losses

Active Publication Date: 2012-01-11
BEIJING ZEHUA CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Catalysts dissolved in liquid media are easily precipitated from the liquid and lose their catalytic activity

Method used

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  • Method and apparatus for synthesizing acetic acid by methanol low-voltage carbonylation
  • Method and apparatus for synthesizing acetic acid by methanol low-voltage carbonylation
  • Method and apparatus for synthesizing acetic acid by methanol low-voltage carbonylation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] The device used in this example is figure 2 As shown, the structure of the multifunctional tower is as follows Figure 4 shown.

[0079] The stripping section A of the multifunctional tower uses trays, and the number of trays is 8. A streamline distributor is set in the flash section B.

[0080]Using a rhodium-based catalyst, the mass percentage of each component in the reaction solution is: methyl iodide 14%, water 14%, acetic acid 70%, hydrogen iodide 1%, methyl acetate 1%, catalyst content 0.03% (in Rh) . The reactor pressure was 2.86MPa, and the reaction temperature was 185°C.

[0081] The reaction liquid is introduced into the flash section of the multifunctional column. The gas phase obtained by flashing enters the light-removing section of the multi-functional tower, and is separated and purified by means of rectification. The light-removing section is controlled at a pressure of 0.15MPa. The acetic acid purity of the crude acetic acid extracted from the ...

Embodiment 2

[0087] The device used in this example is as image 3 As shown, the structure of the multi-functional tower is as follows Figure 5 shown.

[0088] The light-removing section A of the multi-functional tower uses packing with a height of 5m, of which the lower 0.5m is used as a washing section C to elute the catalyst that may be entrained in the light-removing section in the gas phase after flash evaporation, and further effectively control the loss of the catalyst. A streamlined distributor is provided in the flash section B. The lower part of the flash section is provided with two-layer trays, which are used as stripping section D. Add scrubbing inlet 13 and reboiler return 14.

[0089] Using a rhodium-based catalyst, the mass percentages of the components in the reaction solution are: methyl iodide 14%, water 14%, acetic acid 70%, hydrogen iodide 1%, methyl acetate 1%, and the catalyst content is 0.03% (in Rh). The reactor pressure was 2.86MPa, and the reaction temperatu...

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Abstract

The invention relates to a method for chemically synthesizing acetic acid by using methanol low pressure carbonyl and a device thereof, belonging to the technical field of chemical engineering. The method comprises: methanol and carbon monoxide firstly react in a reactor filled with reaction liquid to generate the acetic acid, and then the reaction liquid enters a multifunctional tower to be processed by flash evaporation and lightness removal to lead overhead fraction of the multifunctional tower to enter a condenser, so that part of light phase in the condensate liquid flows and returns to a lightness removing section of the multifunctional tower, and heavy phase returns to the reactor to continuously take part in the reaction. The method combines the functions of the existing evaporator and lightness removing tower into the multifunctional tower, so as to simplify the flow route of acetic acid preparation, shorten the returning route of catalyst, be beneficial to maintaining the stable property of the catalyst and reducing the loss of the catalyst; the existing evaporator and lightness removing tower are combined into a whole, so that the equipment investment is reduced and thedifficulty of operation and control can be lowered.

Description

technical field [0001] The invention relates to a method and a device for synthesizing acetic acid by low-pressure carbonylation of methanol, belonging to the technical field of chemical industry. Background technique [0002] Among the synthetic methods of acetic acid, the most commercially valuable is the low-pressure oxo of methanol to acetic acid, which first appeared in US Pat. No. 3,769,329. In an aqueous reaction liquid medium containing a catalyst (mainly a group VIII metal catalyst such as rhodium and iridium, etc.) and a halogen co-catalyst (such as methyl iodide), carbon monoxide is subjected to carbonylation of an alkyl alcohol or a derivative thereof to obtain a carboxylic acid Or its derivatives, especially carbonylation with methanol, give acetic acid. [0003] Typical low-pressure oxo-acetic acid processes for rhodium-based catalysts include the "high water" carbonylation process disclosed in US Pat. No. 3,769,329, where 14-15% (wt) water concentration is ty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/08C07C51/12C07C51/44
Inventor 谢润兴颜庭政唐红萍
Owner BEIJING ZEHUA CHEM ENG
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