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Treatment process of water-insoluble VOCs waste gas

A water-insoluble, treatment process technology, applied in the field of water-insoluble VOCs waste gas treatment process, can solve the problems of low VOCs purification efficiency, VOCs tail gas not up to standard, large amount of absorbent, etc., to reduce the amount, realize recycling, The effect of reducing operating costs

Inactive Publication Date: 2018-02-16
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 low VOCs purification efficiency, large amount of absorbent, and large loss in the existing water-insoluble VOCs waste gas treatment method, which causes the VOCs tail gas discharged into the atmosphere to be substandard and serious. Waste the defect of absorbent, and then provide a treatment process for water-insoluble VOCs waste gas

Method used

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  • Treatment process of water-insoluble VOCs waste gas
  • Treatment process of water-insoluble VOCs waste gas
  • Treatment process of water-insoluble VOCs waste gas

Examples

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Embodiment 1

[0037] use as figure 1 The shown water-insoluble VOCs waste gas treatment process has a concentration of 12000mg / m for a pharmaceutical company 3 The exhaust gas of butyl acetate (the air volume is 800m 3 / h) for processing, the specific process is as follows:

[0038] In this example, the water-insoluble VOCs specifically refers to butyl acetate.

[0039] The exhaust gas treatment process containing butyl acetate in this embodiment includes two exhaust gas absorption units arranged in series, that is, the first-end absorption tower 2 and the second-stage absorption tower 3 . The absorbent enters the secondary absorption tower 3, and the exhaust gas containing butyl acetate enters from the first-end absorption tower 2, and cross-flow contacts with the absorbent in the first-end absorption tower 2, and the absorbent in the first-end absorption tower 2 is mixed with acetic acid The volume ratio of the waste gas of butyl ester is 1:60, so that butyl acetate is enriched in the ...

Embodiment 2

[0046] use as figure 2 The shown water-insoluble VOCs waste gas treatment process has a concentration of 81000mg / m for a chemical company 3 Xylene waste gas (air volume is 1200m 3 / h) for processing, the specific process is as follows:

[0047] In this embodiment, the water-insoluble VOCs specifically refer to xylene.

[0048] The exhaust gas treatment process containing xylene in this embodiment includes three exhaust gas absorption units arranged in series, namely the head-end absorption tower 2 , the second-stage absorption tower 3 and the third-stage absorption tower 4 . The absorbent enters the third-stage absorption tower 4, and the exhaust gas containing xylene enters from the head-end absorption tower 2, and cross-flow contacts with the absorbent in the head-end absorption tower 2, so that the xylene 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 tow...

Embodiment 3

[0055] 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 The exhaust gas of butyl butyrate (the air volume is 200m 3 / h) for processing, the specific process is as follows:

[0056] In this example, the water-insoluble VOCs specifically refers to butyl butyrate.

[0057]The exhaust gas treatment process containing butyl butyrate in this embodiment includes four exhaust gas absorption units arranged in series, namely, the head-end absorption tower 2, the second-stage absorption tower 3, the third-stage absorption tower 4 and the fourth-stage absorption tower 5. The absorbent enters the fourth-stage absorption tower 5, and the exhaust gas containing butyl butyrate enters from the head-end absorption tower 2, and cross-flow contacts with the absorbent in the head-end absorption tower 2, so that butyl butyrate is enriched in the absorbent Among them, in the present embodiment, the absorbent is ...

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Abstract

The invention discloses a treatment process of water-insoluble VOCs waste gas. The process involves at least two waste gas absorption units arranged in series connection, waste gas enters the waste gas absorption units and contacts an absorbent, one part of the generated absorption liquid that absorbs water-insoluble VOCs is cycled back to a current waste gas absorption unit to serve as an absorbent, and the rest is cycled back to a previous waste gas absorption unit to serve as an absorbent of the previous waste gas absorption unit. Through the above settings, on the one hand, the water-insoluble VOCs waste gas passes through at least two waste gas absorption units in series connection, thus increasing the VOCs purification efficiency and reducing the amount of VOCs tail gas discharged tothe atmosphere; and on the other hand, one part of the generated absorption liquid that absorbs water-insoluble VOCs is cycled back to the current waste gas absorption unit, and the rest is cycled back to the previous waste gas absorption unit, thereby increasing the concentration of VOCs in the absorbent, and greatly reducing the dosage of absorbent.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a treatment 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 chlorofluorocarbons and c...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCB01D53/1406B01D53/1487B01D53/1493B01D2252/205B01D2257/708Y02A50/20
Inventor 黄龙杜松松
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY