Film method for recycling CO in high-pressure exhaust from production of acetic acid by carbonylation

A technology of carbonylation and tail gas, which is applied in the field of CO purification, can solve the problems of inability to directly use membrane separation technology, membrane damage, and high requirements for membrane feed gas, and achieve the effects of small-scale equipment, convenient operation, and high operational reliability

Active Publication Date: 2009-05-27
JIANGSU SOPO CHEM
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Problems solved by technology

[0006] However, the membrane separation technology has high requirements on the gas entering the membrane. At present, in the high-pressure tail gas recovery of acetic acid produced by carb

Method used

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  • Film method for recycling CO in high-pressure exhaust from production of acetic acid by carbonylation
  • Film method for recycling CO in high-pressure exhaust from production of acetic acid by carbonylation
  • Film method for recycling CO in high-pressure exhaust from production of acetic acid by carbonylation

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Embodiment 1

[0040]

[0041] It can be seen from the above examples that the membrane separation device can achieve the design purpose after it is actually put into operation, and the CO content of the product gas reaches more than 91%, which meets the process requirements and realizes the continuous recovery and utilization of the high-pressure tail gas of acetic acid.

[0042] Through the pretreatment system composed of scrubber, mist eliminator and combined filter, the "harmful" components in the exhaust gas are removed to prevent the influence on the stable operation of the membrane; in practical applications, 2 sets of Prison membranes are selected The effective separation of tail gas has been realized, the processing gas volume and product gas composition have met the working requirements, and the optimized combination has been realized; it can be seen from the example 2 Can not effectively remove, so the present invention adjusts the gas volume that product gas enters acetic acid ...

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Abstract

The invention discloses a method for recovering CO from a high-pressure acetic acid tail gas produced by carbonylation through a membrane process and a device thereof. The tail gas is treated by three steps, that is, pretreatment, membrane separation and gas compression: the tail gas that passes a gas washing tower, a demister and a combined filter enters a Prisen membrane separator through a heater, the tail gas after the membrane separation enters a compressor, a product gas is recovered and reused, and hydrogen rich gas flows to a torch for burning. In the method, two Prisen membrane systems help control the amount of the feed gas entering a membrane, the product gas and the hydrogen rich gas to reach N2 material balance, ensure the CO recovery rate and achieve the purpose of the long and stable operation of a membrane separation device; and the content of the CO in the final product gas is not less than 91%.

Description

technical field [0001] The invention relates to a technology for purifying CO from mixed tail gas discharged from acetic acid production, in particular to a recovery method for CO in high-pressure tail gas produced by carbonylation of acetic acid. Background technique [0002] Since the early 1970s, Prick proposed carbonylation with carbon monoxide and methanol in U.S. Patent No. 3,769,329, and adopted rhodium, methyl iodide, methyl acetate, water, etc. as catalysts to produce acetic acid. This technology has been fully industrialized by the world. More than 75% of the total amount of acetic acid is produced by this method, which has the advantages of high methanol selectivity, simple purification, compact process flow, and low production cost. Although this method has contributed to the optimization of the acetic acid production process in the carbonylation production of acetic acid reaction solution and catalyst research in recent decades by large-scale acetic acid product...

Claims

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Application Information

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IPC IPC(8): B01D53/22C01B31/18C07C51/12C07C51/64C07C53/08C01B32/40
Inventor 宋勤华胡宗贵许宝华陈钢刘玲朱桂生谢泽宇徐建
Owner JIANGSU SOPO CHEM
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