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Catalyst system used in low pressure methanol carbonyl synthesizing acetic acid

A catalytic system, oxo synthesis technology, applied in the direction of organic compound/hydride/coordination complex catalyst, physical/chemical process catalyst, carbon monoxide reaction to prepare carboxylic acid, etc., can solve pollution, concentration increase, containing methyl acetate and Increase in methyl iodide and other issues, to achieve the effect of high quality, less by-products, high activity and selectivity

Active Publication Date: 2006-11-29
SHANGHAI HUAYI ENERGY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The effect of two aspects makes the content of methyl acetate and methyl iodide entering and taking off the light tower obviously increase, and the effect of two aspects makes the content of methyl acetate and methyl iodide entering and taking off the light tower obviously increase, and the methyl acetate content is at 5-6% ( wt), the methyl iodide content is at 35-50% (wt), so that the concentration of methyl acetate and methyl iodide in the gas phase inside the tower increases, and methyl acetate and methyl iodide also increase significantly in the fluid of the tower top reflux, resulting in light removal The initial product acetic acid extracted from the tower, although the water content decreases, the amount of methyl acetate and methyl iodide increases significantly, which leads to the increase of methyl acetate and methyl iodide in the output and feed streams of the dehydration tower, especially the overhead reflux The increase in the content of methyl acetate and methyl iodide in the medium has caused the tower product to be polluted by methyl acetate and methyl iodide. Therefore, the change of the catalyst system has caused the content of methyl acetate and methyl iodide in the light removal tower to increase significantly and to be extracted from the light removal tower. The content of primary products acetic acid, methyl acetate and methyl iodide increased significantly

Method used

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  • Catalyst system used in low pressure methanol carbonyl synthesizing acetic acid

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Experimental program
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Effect test

Embodiment 1

[0036] In the catalyst system, the reaction solution consists of: 70.5wt% acetic acid, 1wt% methyl acetate, 12wt% methyl iodide, 14wt% water, Fe0.0025wt%, Ni0.0024wt%, Cr0.0050wt%, Mo0.0100wt%, I - 2.5wt%, Rh0.04wt%.

[0037] Carry out experiments according to the embodiment, and keep the temperature in the decanter 8 at about 40° C., and keep the temperature in the decanter 9 less than 45° C. Keep the flow rate of logistics 41 at 100kg / h, and keep the flow rate of logistics 42 at 100kg / h. The catalyst composition, the composition of stream 12, the density of stream 15, the concentration of stream 21, the composition of stream 25, and the composition of stream 30 were tested. And obtain product 25 127kg, waste acid 30 0.2kg. What table 1 records is the material flow and process condition of embodiment 1.

[0038] Embodiment 1 is as a kind of contrast of the present invention, and decanter 9 is not used as decanter.

[0039] name

Embodiment 2

[0041] The reaction solution in the catalyst system consists of: 59.8wt% acetic acid, 1.94wt% methyl acetate, 10.37wt% methyl iodide, 7.17wt% water, K + 0.5000wt%, Li + 0.3700wt%, Fe 0.1357wt%, Ni 0.0798wt%, Cr 0.0916wt%, I - 10.83wt%, Rh 0.0650wt%.

[0042] Carry out experiments according to the embodiment, and keep the temperature in the decanter 8 at about 36° C., and keep the temperature in the decanter 9 less than 45° C. Keep the flow rate of logistics 41 at 100kg / h, and keep the flow rate of logistics 42 at 75kg / h. The catalyst composition, the composition of stream 12, the density of stream 15, the concentration of stream 21, the composition of stream 25, and the composition of stream 30 were tested. And obtain product 25 179.5kg, spent acid 30 0.23kg. What table 2 records is the material flow and process condition of embodiment 2.

[0043] name

Embodiment 3

[0045] The reaction solution in the catalyst system consists of: 64.9wt% acetic acid, 3.0wt% methyl acetate, 14.0wt% methyl iodide, 8.4wt% water, 0.0341wt% propionic acid, K + 0.4000wt%, Li + 0.3600wt%, Fe 0.1551wt%, Ni 0.1027wt%, Cr 0.1085wt%, Mo 0.0708wt%, I - 9.5wt%, Rh 0.0740wt%.

[0046] Carry out experiments according to the embodiment, and keep the temperature in the decanter 8 at about 32° C., and keep the temperature in the decanter 9 less than 45° C. Keep the flow rate of logistics 41 at 90kg / h, and keep the flow rate of logistics 42 at 50kg / h. The catalyst composition, the composition of stream 12, the density of stream 15, the concentration of stream 21, the composition of stream 25, and the composition of stream 30 were tested. And obtain product 25225.8kg, waste acid 300.25kg. What table 3 records is the material flow and process condition of embodiment 3.

[0047] name

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Abstract

A catalyst system for low-pressure synthesis of acetic acid from methanol and carbonyl group with high activity and selectivity and high quality of product is disclosed. Its liquid reaction media contain proportionally Rh catalyst, alkali metal ions, iodine ions, methyl acetate, iodomethane, metals in families VIIIB and VIB, water and acetic acid.

Description

technical field [0001] The invention relates to the technical field of acetic acid preparation, in particular to a catalyst system for carbonylation of acetic acid from methanol at low pressure. The catalyst system has higher activity and selectivity, fewer reaction by-products, and can produce higher-quality acetic acid products. Background technique [0002] Since Monsanto Corporation of the United States developed the production process of low-pressure methanol carbonylation of acetic acid, low-pressure methanol carbonylation of acetic acid technology has become the main method of producing acetic acid in the world. [0003] The known production process of low-pressure methanol carbonylation of acetic acid is shown in "Encyclopedia of Chemical Industry", page 719 of the second volume of the 4th edition in 1991. Methanol is preheated and added to the bottom of reactor 1 together with carbon monoxide, returned mother liquor containing catalyst, light distillates returned fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/30B01J31/02C07C53/08C07C51/12
Inventor 陈大胜曹智龙刘艳吴文晶
Owner SHANGHAI HUAYI ENERGY CHEM