Treatment process of VOCs (volatile organic chemicals) waste gas

A treatment process and exhaust gas technology, applied in gas treatment, air quality improvement, membrane technology, etc., can solve the problems of inability to purify VOCs and reduce the amount of absorbent, so as to achieve the effect of reducing the amount of consumption, realizing recycling, and reducing operating costs

Inactive Publication Date: 2018-03-09
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 and reduce the height of the absorption tower while improving the VOCs purification efficiency, and realize the combination of water-soluble VOCs and water-insoluble VOCs. 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 (volatile organic chemicals) waste gas
  • Treatment process of VOCs (volatile organic chemicals) waste gas

Examples

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Embodiment 1

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

[0042] In this embodiment, VOCs specifically refer to dichloromethane and acetone.

[0043] In this embodiment, the waste gas treatment process containing dichloromethane and acetone includes a water-soluble VOCs removal step and a water-insoluble VOCs removal 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. step, wherein the water washing step includes two waste gas absorption units connected in series, i.e. the water washing head end absorption tower 3 and the water washing secondary absorption tower 4, and the oil washing step includes two waste gas absorption unit...

Embodiment 2

[0052] use as figure 2 The shown VOCs waste gas treatment process has a concentration of 82000mg / m for a chemical company 3 of xylene and a concentration of 81000mg / m 3 The mixed waste gas of acetone (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 and a water-insoluble VOCs removal 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, i.e. 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 step includes three waste...

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Abstract

The invention discloses a treatment process of VOCs (volatile organic chemicals) waste gas. The treatment process includes the steps: removing water-soluble VOCs; removing water-insoluble VOCs. Two steps adopt at least two serially connected waste gas absorption units. In the same removal step, absorbing agents enter from a tail end waste gas absorption unit, waste gas enters the waste gas absorption unit and contacts with the absorbing agents, one part of generated absorption liquid absorbing the VOCs cycles to the waste gas absorption unit and serves as the absorbing agents to be used, and the rest absorption liquid cycles to the front waste gas absorption unit and serves as absorbing agents of the front waste gas absorption unit to be used. The process has the advantages that the purification efficiency of the VOCs is improved, the consumption of the absorbing agents is reduced, energy consumption is reduced, and the height of an absorption tower is reduced.

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): B01D53/14
CPCB01D53/1406B01D53/1418B01D53/1425B01D53/1487B01D53/1493B01D2252/103B01D2252/205B01D2252/2053B01D2257/708B01D2258/02Y02A50/20
Inventor 黄龙
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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