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Phthalic anhydride tail gas recycling process

A technology for recovering phthalic anhydride and tail gas, which is applied to the separation of dispersed particles, chemical instruments and methods, and separation methods, etc. It can solve the problems of strong acid wastewater corrosion, surrounding air pollution, and high equipment requirements, and achieve large processing capacity. , simple structure and high gas velocity

Inactive Publication Date: 2016-10-12
GUANGDONG RONGTAI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The known phthalic anhydride production process produces a large amount of waste gas, and its main harmful substances are a small amount of citric acid, phthalic anhydride, small molecule acids, a large amount of carbon dioxide, carbon monoxide gas, etc., so it pollutes the surrounding atmosphere
[0003] At present, there are two treatment methods for phthalic anhydride waste gas in the world: one is to incinerate the tail gas, and the waste gas generated in the production of phthalic anhydride is completely burned through an incinerator equipped with a catalyst, and the burned gas meets the environmental protection emission standard. However, the use of incineration will cause waste of resources; the second is to use water treatment to absorb the maleic anhydride, phthalic anhydride and small molecule acids in the waste gas that are harmful to the environment, and the absorbed tail gas is emptied and recycled to reach a certain concentration. Acidic water can be recovered through comprehensive treatment to generate fumaric anhydride (fumaric acid) to achieve valuable comprehensive utilization
However, after the tail gas is absorbed by the water absorption method, a large amount of acidic wastewater will be produced, which is highly corrosive and requires high equipment requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A phthalic anhydride tail gas recovery process, the specific steps of the process are as follows:

[0025] S1. Pre-leaching: The tail gas of phthalic anhydride from the switching condenser and rectifying air injector enters the recovery washing device in turn, and the standard volume flow rate of the tail gas of phthalic anhydride before entering the pre-washing is 20000Nm 3 / h, the gas flow rate is 8.74m / s, the mass flow rate of organic matter in the tail gas is 106.9kg / h, and the air pressure is 6KPa. First, it enters the pre-rinsing device for pre-rinsing treatment. The pre-rinsing is washed with tap water, and the water temperature is 40 ℃ ~ 70 ℃, absorb part of the organic matter through the pre-washing step, the absorption rate of the organic matter in the tail gas in the pre-washing step reaches 15.2%; The valve is switched and transported to the fumaric acid process, and the tail gas of phthalic anhydride not absorbed by the pre-washing step enters the dense pha...

Embodiment 2

[0034] A phthalic anhydride tail gas recovery process, the specific steps of the process are as follows:

[0035] S1. Pre-leaching: The tail gas of phthalic anhydride from the switching condenser and rectifying air injector enters the recovery washing device in turn, and the standard volume flow rate of the tail gas of phthalic anhydride before entering the pre-washing is 30000Nm 3 / h, the gas flow rate is 13.11m / s, the mass flow rate of organic matter in the tail gas is 153.6kg / h, and the air pressure is 7KPa. First, it enters the pre-leaching device for pre-rinsing treatment. The pre-rinsing adopts tap water for washing, and the water temperature is 40 ℃ ~ 70 ℃, absorb part of the organic matter through the pre-washing step, the absorption rate of the organic matter in the tail gas in the pre-washing step reaches 15.3%; The valve is switched and transported to the fumaric acid process, and the tail gas of phthalic anhydride not absorbed by the pre-washing step enters the den...

Embodiment 3

[0044] A phthalic anhydride tail gas recovery process, the specific steps of the process are as follows:

[0045] S1. Pre-leaching: The tail gas of phthalic anhydride from the switching condenser and rectifying air injector enters the recovery washing device in turn, and the standard volume flow rate of the tail gas of phthalic anhydride before entering the pre-washing is 41000Nm 3 / h, the gas flow rate is 17.91m / s, the mass flow rate of organic matter in the tail gas is 153.6kg / h, and the air pressure is 8KPa. First, it enters the pre-rinsing device for pre-rinsing treatment. The pre-rinsing is washed with tap water, and the water temperature is 40 ℃ ~ 70 ℃, absorb part of the organic matter through the pre-washing step, the absorption rate of the organic matter in the tail gas in the pre-washing step reaches 15.3%; The valve is switched and transported to the fumaric acid process, and the tail gas of phthalic anhydride not absorbed by the pre-washing step enters the dense ph...

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PUM

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Abstract

The invention belongs to the technical field of waste gas treatment and particularly relates to a phthalic anhydride tail gas recycling process. The process comprises the specific steps of: pre-eluting, washing a concentrated phase, washing a diluted phase and removing foam, so as to finish the recycling of phthalic anhydride tail gas. By virtue of the recycling process provided by the invention, the absorption efficiency and the operation elasticity of equipment of the tail gas are greatly improved, so that the tail gas removal rate is improved to 99% and more from previous 95%. Meanwhile, blocking, damage and the like of the equipment in a tail gas recycling process are also solved and the use efficiency of the equipment is improved.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a phthalic anhydride tail gas recovery process. Background technique [0002] The known phthalic anhydride production process produces a large amount of waste gas, and its main harmful substances are a small amount of citric acid, phthalic anhydride, small molecule acids, a large amount of carbon dioxide, carbon monoxide gas, etc., so it pollutes the surrounding atmosphere. [0003] At present, there are two treatment methods for phthalic anhydride waste gas in the world: one is to incinerate the tail gas, and the waste gas generated in the production of phthalic anhydride is completely burned through an incinerator equipped with a catalyst, and the burned gas meets the environmental protection emission standard. However, the use of incineration will cause waste of resources; the second is to use water treatment to absorb the maleic anhydride, phthalic anh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCB01D53/1406
Inventor 杨宝生薛鹏军许伟斌
Owner GUANGDONG RONGTAI IND
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