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Method for synthesizing acetic acid through low-pressure methanol carbonylation and device thereof

A technology for chemical synthesis and acetic acid, which is applied in the direction of carbon monoxide reaction to prepare carboxylic acid, separation/purification of carboxylic acid compounds, chemical recovery, etc. Equipment investment and the effect of reducing energy consumption

Active Publication Date: 2012-04-25
BEIJING ZEHUA CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Water is repeatedly heated and condensed in the light removal tower and dehydration tower, which also increases the energy consumption of the device and increases the production cost of acetic acid

Method used

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  • Method for synthesizing acetic acid through low-pressure methanol carbonylation and device thereof
  • Method for synthesizing acetic acid through low-pressure methanol carbonylation and device thereof
  • Method for synthesizing acetic acid through low-pressure methanol carbonylation and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] The device used in this example is figure 2 shown. Adopt rhodium-based catalyst, the mass percent of each component in the reaction solution is: methyl iodide 12%, water 12%, acetic acid 75%, hydrogen iodide 0.03%, methyl acetate 0.6%, catalyst content 0.03% (calculated as Rh) . The pressure of the reactor is 2.86MPa, and the reaction temperature is 185°C.

[0071] The reaction liquid is introduced into the flash section of the catalyst recovery tower, and the gas-liquid two-phase is obtained by flash evaporation. The washing liquid is added to the upper part of the catalyst recovery tower, and the washing liquid comes from the liquid in the middle of the rectification tower. The washing liquid is in contact with the gas phase obtained by flash evaporation, and after washing a small amount of catalyst entrained in it, it forms the reaction raffinate together with the liquid phase obtained by flash evaporation, which is recycled from the bottom of the catalyst recove...

Embodiment 2

[0077] The device used in this example is figure 2 shown. The washing liquid is added to the upper part of the catalyst recovery tower, and the washing liquid comes from part of the light phase of the condensate at the top of the rectification tower. All the other are with embodiment 1.

[0078] The flow rate and composition of each stream are shown in Table 2.

[0079]

Embodiment 3

[0081] The device used in this example is image 3 shown. 20% of the reaction liquid drawn from the middle of the reactor enters the reaction liquid heat exchanger, lowers the temperature to 180°C, and then returns to the reactor. All the other are with embodiment 1.

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Abstract

The invention relates to a method for synthesizing acetic acid through low-pressure methanol carbonylation and a device thereof, belonging to the field of chemical technology. The invention comprises the following steps: firstly, carrying out reaction between methanol and carbon monoxide in a reactor containing a reaction solution so as to generate the acetic acid; feeding the reaction solution into a catalyst recovery tower to recover a catalyst through flash vaporization and washing; feeding flash vaporization gas phase into a rectifying tower, and obtaining finished acetic acid through rectification; condensing fractions of the top of the rectifying tower and then dividing the fractions into light phase and heavy phase, wherein a part of the light phase flows back to the upper part of the rectifying tower, and the remnant light phase and heavy phase flow back to the reactor to continuously take part in reaction. In the invention, the prior functions executed by a lightness-removingtower and a dehydrating tower are merged to be completed in the rectifying tower so that the process route of acetic acid preparation is simplified, the equipment investment of the device is reduced,the difficulty of operation control is reduced at the same time, consumption of the device can be effectively reduced, and the production cost is reduced.

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 a Group VIII metal catalyst, 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 carboxyl Acid or its derivatives, especially carbonylation with methanol, gives 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, generally u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C51/44C07C51/42C07C51/12C07C53/08
CPCY02P20/584
Inventor 唐红萍颜庭政谢润兴
Owner BEIJING ZEHUA CHEM ENG
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