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

A technology of chemical synthesis and acetic acid, which is applied in the preparation of carboxylic acid by carbon monoxide reaction, separation/purification of carboxylic acid compound, organic chemistry, etc., can solve the problem of loss of catalytic activity, reduce mist entrainment, reduce catalyst loss, and shorten return route effect

Active Publication Date: 2009-08-12
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] Adopt rhodium-based catalyst, the mass percent 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% (calculated as Rh) . The pressure of the reactor is 2.86MPa, and the reaction temperature is 185°C.

[0081] The reaction liquid is introduced into the flash section of the multifunctional tower. The gas phase obtained by flash evaporation enters the light removal section of the multifunctional tower, and adopts rectification method for separation and purification. The light removal section is controlled at a pressure of 0.15MPa. The acetic acid purity of the crude acetic a...

Embodiment 2

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

[0088] The delightening section A of the multifunctional tower uses packing with a packing height of 5m, and the lower part 0.5m is used as the washing section C to elute the catalyst that may be entrained to the delightening section in the gas phase after flash evaporation, so as to further effectively control the loss of catalyst. A streamline distributor is set in the flash section B. The lower part of the flash section is equipped with 2 trays, which is used as the stripping section D. Add washing liquid inlet 13 and reboiler return port 14.

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

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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 the difficulty 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 methanol low-pressure carbonylation, belonging to the technical field of chemical industry. Background technique [0002] Among the synthesis methods of acetic acid, the most commercially valuable one is the low-pressure carbonylation of methanol to acetic acid, which first appeared in US Patent No. 3,769,329. In an aqueous reaction liquid medium containing a catalyst (mainly Group VIII metal catalysts such as rhodium and iridium, etc.) and a halogen cocatalyst (such as methyl iodide), carbon monoxide performs a carbonylation reaction on an alkyl alcohol or a derivative thereof to obtain a carboxylic acid Or its derivatives, especially carbonylation reaction with methanol, to obtain acetic acid. [0003] The low-pressure carbonylation acetic acid method of typical rhodium-based catalyst comprises U.S. Patent No.3,769, and " high water " carbonylation method disclosed in 329...

Claims

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Application Information

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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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