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Treatment process of VOCs exhaust gas

A treatment process and tail gas treatment technology, applied in gas treatment, air quality improvement, membrane technology, etc., can solve the problems of VOCs purification efficiency reduction, energy consumption reduction, etc., to reduce consumption, reduce operating costs, and improve purification efficiency Effect

Inactive Publication Date: 2018-02-09
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 existing VOCs waste gas treatment method, which cannot reduce the amount of absorbent, reduce energy consumption, reduce the height of the absorption tower, and realize the combination of water-soluble VOCs and water-insoluble VOCs while improving VOCs purification efficiency. Recycling and processing separately, and then providing a treatment and recovery process for VOCs waste gas

Method used

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  • Treatment process of VOCs exhaust gas
  • Treatment process of VOCs exhaust gas

Examples

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Effect test

Embodiment 1

[0040] use as figure 1 The VOCs exhaust gas treatment process shown has a concentration of 11500mg / m for a chemical company 3 of dichloromethane and a concentration of 11500mg / m 3 The mixed waste gas of acetone (the air volume is 800m 3 / h) for processing, the specific process is as follows:

[0041] In this embodiment, VOCs specifically refer to dichloromethane and acetone.

[0042] The exhaust gas treatment process containing dichloromethane and acetone in this embodiment includes a water-soluble VOCs removal step, a water-insoluble VOCs removal step, and an exhaust gas treatment step. In this embodiment, the water-soluble VOCs removal step refers to the water washing step, and the water-insoluble VOCs removal step The step refers to the oil washing step, wherein the water washing step includes two waste gas absorption units connected in series, that is, the water washing head end absorption tower 3 and the water washing secondary absorption tower 4, and the oil washing s...

Embodiment 2

[0052] use as figure 2 The VOCs waste gas treatment process shown has a concentration of 80,000 mg / m for a chemical company 3 of xylene and a concentration of 81000mg / m 3 The mixed exhaust gas (air volume is 1200m 3 / h) for processing, the specific process is as follows:

[0053] In this embodiment, VOCs specifically refer to xylene and acetone.

[0054] In this embodiment, the exhaust gas treatment process containing xylene and acetone includes a water-soluble VOCs removal step, a water-insoluble VOCs removal step, and an exhaust gas treatment step. In this embodiment, the water-soluble VOCs removal step refers to the water washing step, and the water-insoluble VOCs removal step Refers to the oil washing step, wherein the water washing step includes three waste gas absorption units connected in series, namely the water washing head-end absorption tower 3, the water washing secondary absorption tower 4 and the water washing tertiary absorption tower 7, and the oil washing ...

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Abstract

The invention discloses a treatment process of VOCs exhaust gas. The treatment process comprises the steps of water-soluble VOCs removal, non-water-soluble VOCs removal and exhaust gas treatment. In the removal steps, at least two serially connected exhaust gas absorbing units are adopted, an absorbent enters the tail end exhaust gas absorbing unit in the same removal step, the exhaust gas entersthe exhaust gas absorbing units and is in contact with the absorbent, then a part of produced absorption liquid absorbing VOCs is circulated back to the exhaust gas absorbing units to serve as the absorbent, and the rest is circulated back to the previous exhaust gas absorbing unit to serve as the absorbent of the previous exhaust gas absorbing unit. The process has the advantages of improving theVOCs purifying efficiency, decreasing the use amount of the absorbent, reducing energy consumption and reducing the height of an absorption tower. In addition, absorbent in exhaust gas is recycled byadopting the process, and the use amount of the absorbent is decreased to the greatest degree.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a treatment process for VOCs waste gas. Background technique [0002] Volatile organic compounds (VOCs for short) are air pollutants, including water-soluble VOCs and water-insoluble VOCs, specifically referring to organic compounds whose saturated vapor pressure exceeds 70.91Pa and boiling point is less than 260°C at normal temperature and pressure, and its main components are Hydrocarbons, oxygen hydrocarbons, halogenated hydrocarbons, nitrogen hydrocarbons 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 q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/18B01D53/14
CPCB01D53/1406B01D53/1487B01D53/1493B01D53/18B01D2252/103B01D2252/20B01D2252/50B01D2257/708Y02A50/20
Inventor 黄龙
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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