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Treatment and recovery process for non-water-soluble VOCs exhaust gases

A non-water-soluble, waste gas technology, applied in air quality improvement, dispersed particle separation, chemical instruments and methods, etc., can solve problems such as substandard VOCs exhaust, low VOCs purification efficiency, and inability to achieve zero emissions, and reduce energy consumption. , the effect of reducing pressure drop and reducing operating costs

Inactive Publication Date: 2018-03-23
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the problems of low VOCs purification efficiency, large amount of absorbent, large loss and failure to recycle the absorbent adsorbed with VOCs in the existing water-insoluble VOCs waste gas treatment method Defects, resulting in the VOCs exhaust gas discharged into the atmosphere is not up to standard, serious waste of absorbent and can not achieve zero emissions, and then provide a treatment and recovery process for water-insoluble VOCs waste gas

Method used

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  • Treatment and recovery process for non-water-soluble VOCs exhaust gases
  • Treatment and recovery process for non-water-soluble VOCs exhaust gases
  • Treatment and recovery process for non-water-soluble VOCs exhaust gases

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] use as figure 1 The shown non-water-soluble VOCs waste gas treatment process has a concentration of 12000mg / m for a chemical company 3 The exhaust gas of dichloromethane (air volume is 800m 3 / h) for processing, the specific process is as follows:

[0042] In this example, the water-insoluble VOCs specifically refers to dichloromethane.

[0043] The waste gas treatment process containing dichloromethane in this embodiment includes two waste gas absorption units arranged in series, that is, the head-end absorption tower 4 and the secondary absorption tower 5 . The absorbent enters the secondary absorption tower 5, and the waste gas containing dichloromethane enters from the head-end absorption tower 4, and cross-flow contacts with the absorbent in the head-end absorption tower 4, and the absorbent in the head-end absorption tower 4 is mixed with the The volume ratio of the exhaust gas of methyl chloride is 1:55, so that methylene chloride is enriched in the absorbent,...

Embodiment 2

[0050] use as figure 2 The shown water-insoluble VOCs waste gas treatment process has a concentration of 81000mg / m for a chemical company 3 Styrene waste gas (air volume is 1200m 3 / h) for processing, the specific process is as follows:

[0051] In this embodiment, the water-insoluble VOCs specifically refers to styrene.

[0052] The waste gas treatment process containing styrene in this embodiment includes three waste gas absorption units arranged in series, namely the head-end absorption tower 4 , the second-stage absorption tower 5 and the third-stage absorption tower 6 . The absorbent enters the three-stage absorption tower 6, and the waste gas containing styrene enters from the head-end absorption tower 4, and cross-flow contacts with the absorbent in the head-end absorption tower 4, so that styrene is enriched in the absorbent. In the embodiment, the absorbent is specifically N-ethylpyrrolidone, and the volume ratio of the absorbent in the head-end absorption tower 4...

Embodiment 3

[0059] use as image 3 The shown non-water-soluble VOCs waste gas treatment process has a concentration of 22000mg / m for a chemical company 3 Exhaust gas of butyl butyrate (air volume is 200m 3 / h) for processing, the specific process is as follows:

[0060] In this example, the water-insoluble VOCs specifically refers to butyl butyrate.

[0061] The exhaust gas treatment process containing butyl butyrate in this embodiment includes four exhaust gas absorption units arranged in series, that is, the first absorption tower 4, the second absorption tower 5, the third absorption tower 6 and the fourth absorption tower 7. The absorbent enters the four-stage absorption tower 7, and the waste gas containing butyl butyrate enters from the head-end absorption tower 4, and contacts with the absorbent in the head-end absorption tower 4 in cross-flow, and the absorbent in the head-end absorption tower 4 is mixed with the The volume ratio of the waste gas of butyl butyrate is 1:50, so t...

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Abstract

The invention discloses a treatment and recovery process for non-water-soluble VOCs exhaust gases. The process comprises at least two exhaust gas absorbing units arranged in series, after the exhaustgases enter the exhaust gas absorbing units to be in contact with an absorbent, a part of a produced absorbing liquid adsorbing non-water-soluble VOCs is circulated back to the own exhaust gas absorbing unit to be taken as an absorbent for use, and the rest is circulated back to the previous exhaust gas absorbing unit to be taken as an absorbent of the previous exhaust gas absorbing unit for use.The process provided by the invention has the advantages of improving the purification efficiency of the VOCs, reducing the usage amount of the absorbent, and realizing recycling of the non-water-soluble VOCs; and the process can reduce the tail-gas amount of the VOCs exhausted into the atmosphere as far as possible through adjusting the number of the exhaust gas absorbing units.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a treatment and recovery process for water-insoluble VOCs waste gas. Background technique [0002] Volatile organic compounds (VOCs for short) are air pollutants, specifically referring to organic compounds with a saturated vapor pressure exceeding 70.91Pa and a boiling point less than 260°C at normal temperature and pressure, and its main components are hydrocarbons, oxygenated hydrocarbons, and halogenated hydrocarbons , nitrogen and sulfur hydrocarbons, etc. On the one hand, most VOCs are toxic, which are carcinogenic, teratogenic, mutagenic and harmful to the human body, and most VOCs are prone to photochemical reactions with some oxidants in the atmosphere to generate photochemical smog, which seriously affects the growth of crops. And it will endanger human health; on the other hand, some VOCs will break the ozone layer quickly, such as chlorofluoro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCB01D53/1425B01D53/1487B01D2252/504Y02A50/20
Inventor 黄龙
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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