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Recovery Method of Useful Components in Tail Gas in Acetic Acid Plant

A recovery method and a technology of a tail gas absorption tower, which are applied in separation methods, chemical instruments and methods, organic chemistry, etc., can solve the problems of large methanol consumption, large equipment investment, complex process, etc., and achieve energy saving, equipment investment and Operating costs, the effect of reducing volatilization

Active Publication Date: 2017-01-04
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the prior art has complex processes, large equipment investment, high cooling capacity consumption, and large methanol loss. A new method for recovering useful components of tail gas in acetic acid plants is provided

Method used

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  • Recovery Method of Useful Components in Tail Gas in Acetic Acid Plant
  • Recovery Method of Useful Components in Tail Gas in Acetic Acid Plant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] use figure 1 The process shown. The tail gas absorption unit is provided with only one tail gas absorption tower, and the raw material methanol of the carbonylation reaction is used as the absorbent, and the tail gas from the reaction process and the tail gas from the rectification process directly enter the tail gas absorption tower. After treatment in the absorption tower, the top stream contains H 2 , CH 4 , N 2 , CO, CO 2 And a small amount of methanol can be directly sent to the flare system; the rich liquid at the bottom of the tower is mainly methanol, methyl iodide and a small amount of methyl acetate, which can directly lead to the reaction device.

[0026] In terms of weight percentage, the tail gas from the reaction process includes: methane 4.2%, CO 40.5%, CO 2 14.7%, iodomethane 25.5%, pressure is 0.3MPa. The tail gas from the distillation process includes: methane 6.4%, CO 35.2%, CO 2 7.2%, 28.7% of methyl iodide, and a pressure of 0.21MPa. The total feed co...

Embodiment 2

[0038] use figure 1 The process shown. In terms of weight percentage, the tail gas from the reaction process includes: 8% methane, 31% CO, CO 2 8.0%, iodomethane 35%, pressure is 0.3MPa. The tail gas from the distillation process includes: methane 6.2%, CO 45%, CO 2 8.0%, 21% methyl iodide, pressure 0.21MPa. The total feed composition of the tail gas absorption tower is: hydrogen 0.1%, methane 7.3%, nitrogen 5.7%, CO36.2%, CO211.7%, methanol 873ppm, methyl iodide 29.8%, methyl acetate 9.0%, and acetic acid 0.1%. The temperature of the absorbent methanol is 10°C. The pressure of the absorption tower is 0.2MPa.

[0039] The results of the absorption treatment are shown in Table 3. The recovery rate of methyl iodide reaches 100%, and the heat load of the methanol cooler is 247.3KW.

[0040] table 3

[0041] Component Top flow of absorption tower (wt%) Bottom flow of absorption tower (wt%) H20.000609041.4925e-07 CH 4 0.119413820.00017200 N20.095852624.1167e-05 CO0.592856420.000...

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Abstract

The present invention relates to a recovery method for useful tail gas components in an acetic acid apparatus, wherein problems of complex process, high equipment investment, high cold quantity consumption and high methanol loss in the prior art are mainly solved. The technical scheme comprises that: tail gas from a reaction process and tail gas from a rectification process contact methanol in a tail gas absorption tower, the stream on the tail gas absorption tower top is conveyed to a torch system, and the stream on the tower kettle is cycled to the reaction process, wherein the methanol temperature is more than 0-12 DEG C. With the technical scheme, the problems in the prior art are well solved. The recovery method can be used for tail gas recovery of acetic acid synthesis through low pressure carbonylation of methanol in industrial production.

Description

Technical field [0001] The invention relates to a method for recovering useful components of tail gas in an acetic acid plant. Background technique [0002] Acetic acid is one of the important organic acids. It is mainly used to synthesize vinyl acetate, cellulose acetate, acetate, metal acetate, etc. It can also be used as a solvent in other organic synthesis processes, such as PTA production, etc., as well as pharmaceuticals, fuels, and pesticides. , Photosensitive materials and other important raw materials for organic synthesis. [0003] In the 1970s, Monsanto successfully developed the methanol low-pressure carbonyl synthesis process, which has now become the main production method of acetic acid in the world. The oxo acetic acid reaction product is rectified, and the exhaust gas produced mainly contains methyl iodide. Methyl iodide is used as a co-catalyst for oxo acetic acid. If it is directly discharged or incinerated, it will waste raw materials and cause environmental p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C19/07C07C17/38B01D53/14
Inventor 张艺徐曼许慎艳张翼贾微贾震
Owner SINOPEC SHANGHAI ENG