Method for reclaiming methylene chloride from waste gas

A dichloromethane and recovery method technology, which is applied in the field of recovery of dichloromethane in exhaust gas, can solve the problems of limiting the application of absorption recovery technology and high requirements on absorbent performance, and achieves small one-time investment, high recovery rate and reliable operation Effect

Inactive Publication Date: 2007-05-16
TSINGHUA UNIV
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Problems solved by technology

Due to the high performance requirements of the absorbent, it also limits the application of absorption recovery technology to a certain extent.

Method used

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  • Method for reclaiming methylene chloride from waste gas

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Embodiment Construction

[0014] The invention proposes a method for recovering dichloromethane in waste gas. This recovery method adopts the combination method of condensation and absorption to recover the dichloromethane in the exhaust gas. First, water is used as the cooling medium to condense the exhaust gas, and then dimethylformamide is used as the absorbent in the packed absorption tower to remove dichloromethane in the exhaust gas. Chloromethane is absorbed, and the absorbent is heated and decomposed in the falling film evaporator under negative pressure conditions, so that the absorbent is regenerated to form a closed cycle. Among them, the absorbent should have greater solubility for the organic gas to be recovered, obvious selective absorption, low volatility, low viscosity, low pressure drop, non-corrosive, non-toxic, high conductivity, non-flammable, non-foaming, freezing point Low, cheap and easy to obtain, easy to desorb and regenerate, good chemical stability, etc. Fig. 1 is the proces...

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Abstract

The invention relates to a method for recycling carrene of waste gas, wherein the invention uses condense-adsorption method to recycle the carrene of organic waste gas; uses water as cooling medium to condense the waste gas; then uses dimethyl formamide in the stuff adsorption tower as absorber to absorb the carrene; the absorber is analyzed in passive pressure in degrade vaporizer, to regenerate the absorber and form loop-close circulation. The invention has low cost and high efficiency.

Description

technical field [0001] The invention belongs to the field of gas purification and solvent recovery, in particular to a method for recovering dichloromethane in waste gas. technical background [0002] Organic solvents are widely used in various industrial processes, such as petrochemical, pharmaceutical, printing, adhesive, painting and other industries. A considerable part of these solvents is finally discharged into the atmosphere in the form of organic waste gas. The volatile organic compounds in the waste gas are called VOCs (Volatile Organic Compounds), and most of these organic compounds are toxic. Organic waste gas, particulate (dust), SO 2 , NO x It is listed as the four major air pollutants, among which organic waste gas emissions account for a relatively large share in several air pollutants, which not only greatly wastes resources, but also pollutes the environment. With the gradual improvement of people's living standards and the gradual enhancement of environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D5/00B01D53/70C07C17/38C07C19/03
Inventor 杨明德吴玉龙党杰胡湖生陈镇张建安
Owner TSINGHUA UNIV
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