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Recovery method of tail gas light component in carbonylation production of acetic acid lanhydride

A recovery method and carbonylation technology are applied in the field of tail gas recovery in acetic acid production to achieve the effect of reducing consumption

Active Publication Date: 2005-08-10
SHANGHAI HUAYI ENERGY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a process method requires a large amount of acetic acid circulation and steam. Generally, a set of 400,000 tons / year acetic acid plant in the industry needs to have a circulation of 20 tons / hour and consume about 5t / h of steam.

Method used

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  • Recovery method of tail gas light component in carbonylation production of acetic acid lanhydride
  • Recovery method of tail gas light component in carbonylation production of acetic acid lanhydride
  • Recovery method of tail gas light component in carbonylation production of acetic acid lanhydride

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1, 2, 3, 4, 5, 6, 7, 8, 9:

[0030] Acetic acid is used as the first-stage absorption solution, and the first-stage absorption is carried out without the second-stage absorption test. with a certain amount of N 2 Through the methyl iodide and methyl acetate generator, the N containing methyl iodide and methyl acetate saturated gas 2 The gas passes through the first-stage low-pressure absorption tower and is absorbed with acetic acid. Experiments were carried out under different temperatures of methyl iodide and methyl acetate generators and different absorption temperatures of acetic acid. See Table 1 for the data.

[0031] Acetic acid freezes at 16.7°C, so the temperature cannot be lowered.

Embodiment 10～24

[0033] Examples 10-24 are examples in which methanol is absorbed in the first stage and acetic acid is absorbed in the second stage. 10 to 24 are data that vary according to the temperature of methyl iodide, methyl acetate generator, and absorbent. See Table 2.

Embodiment 25～28

[0035] Examples 25-28 are examples in which methyl acetate is used as the absorption solution for the first-stage absorption and acetic acid is used for the second-stage absorption. The data are shown in Table 3.

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Abstract

A process for recovering the light components from the tail gas generated in preparing acetic acid / acetic oxide by carbonylating features use of two-class solution absorption to recover the light components from the non-coagulating gas and the exhausted gas of reactor.

Description

technical field [0001] The invention relates to a method for recovering tail gas in acetic acid production, in particular to a method for recovering light components of tail gas in carbonylation production of acetic acid / acetic anhydride. Background technique [0002] In the early 1970s, Prick proposed a carbonylation method with carbon monoxide and methanol in U.S. Patent No. 3,769,329, and rhodium, methyl iodide, methyl acetate, water and acetic acid were included in the catalyst. According to this method, acetic acid can be produced by carbonylation of carbon monoxide and methanol. Finally, the technology is fully industrialized and has industrial applications all over the world. [0003] In the 1980s, Celanese disclosed an improved process for methanol carbonylation in the Chinese patent application CN85101460. Its greatest contribution lies in the invention of adding inorganic iodine salt to maintain the stability of the main catalyst and r...

Claims

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Application Information

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IPC IPC(8): C07C51/12C07C51/42C07C53/08
Inventor 陈大胜刘艳曹智龙吴文晶胡永康
Owner SHANGHAI HUAYI ENERGY CHEM
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