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Absorption method of chlorohydrocarbon-containing waste gas

A technology for chlorinated hydrocarbons and exhaust gas, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of low selectivity of chlorinated hydrocarbons and poor VOCs treatment effect, and achieve good selectivity and enhanced physical absorption Good effect and stability

Active Publication Date: 2021-04-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention is to disperse ionic liquid in water or biodiesel under the action of surfactant and co-surfactant to obtain microemulsion. The microemulsion has a high solubility to VOCs and is effective for fugitive discharge in sewage treatment plants. VOCs are recovered and reused, but this method has low selectivity to chlorinated hydrocarbons, and the treatment effect on high-concentration VOCs from organized emissions is not good

Method used

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  • Absorption method of chlorohydrocarbon-containing waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh choline chloride, ethylene glycol and lysine according to the molar ratio of 1:2:2 and add them to the reactor, stir at 80°C and 100r / min, react for 1h, and cool to room temperature to obtain chlorinated A ternary complex solvent of choline / ethylene glycol / lysine.

[0022] Pass the gas containing dichloromethane into the composite solvent and absorb it in the absorption tower. Control the absorption temperature to 20°C, the pressure to 0.1MPa, and the liquid-gas ratio to 3L / m 3 . After the absorption reaches equilibrium, the weight before and after absorption is detected by gravimetric method, and the amount of dichloromethane absorbed per gram of absorbent is calculated to be 263 mg.

[0023] The rich solvent with absorption balance is decompressed and regenerated, the pressure is 0.01MPa, and the regeneration time is 1h. After 10 cycles of absorption and desorption, the regenerated absorbent was absorbed under the same operating conditions, and the amount of d...

Embodiment 2

[0025] Weigh choline chloride, ethylene glycol and lysine according to the molar ratio of 1:2:4 and add them into the reactor, stir at 90°C and 150r / min, react for 1h, and cool to room temperature to obtain chlorinated A ternary complex solvent of choline / ethylene glycol / lysine.

[0026] Pass the gas containing dichloromethane into the composite solvent and absorb it in the absorption tower, control the absorption temperature to 15°C, the absorption pressure to 0.3MPa, and the liquid-gas ratio to 4L / m 3 . After the absorption reaches equilibrium, the weight before and after absorption is detected by gravimetric method, and the amount of dichloromethane absorbed per gram of absorbent is calculated to be 285mg.

[0027] The rich solvent with absorption balance is decompressed and regenerated, the pressure is 0.03MPa, and the regeneration time is 0.5h. After 10 cycles of absorption and desorption, the regenerated absorbent was absorbed under the same operating conditions, and t...

Embodiment 3

[0029] Weigh choline chloride, ethylene glycol and lysine according to the molar ratio of 1:3:2 and add them into the reactor, stir at 80°C and 150r / min, react for 2 hours, and cool to room temperature to obtain chlorinated A ternary complex solvent of choline / ethylene glycol / lysine.

[0030] Pass the gas containing dichloromethane into the composite solvent and absorb it in the absorption tower, control the absorption temperature to 30°C, the absorption pressure to 0.1MPa, and the liquid-gas ratio to 5L / m 3 . After the absorption reaches equilibrium, the weight before and after absorption is detected by gravimetric method, and the methylene chloride absorbed per gram of absorbent is calculated to be 252 mg.

[0031] The rich solvent with absorption balance is decompressed and regenerated, the pressure is 0.05MPa, and the regeneration time is 1h. After 10 cycles of absorption and desorption, the regenerated absorbent was absorbed under the same operating conditions, and the ...

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Abstract

The invention relates to an absorption method of chlorohydrocarbon-containing waste gas, the chlorohydrocarbon-containing waste gas is contacted with an absorbent, the absorbent is a ternary composite solvent constructed by choline chloride, ethylene glycol and basic amino acid, regeneration is carried out after absorption balance, and the regenerated absorbent is recycled. The ternary composite solvent is used as the absorbent, so that the chlorohydrocarbon in the waste gas can be quickly and effectively absorbed, the absorption efficiency is high, and the selectivity is good.

Description

technical field [0001] The invention belongs to the field of gas absorption, and in particular relates to a method for absorbing waste gas containing chlorinated hydrocarbons. Background technique [0002] As an important organic solvent and product intermediate, chlorinated hydrocarbons are widely used in many chemical industries, but they are often carcinogenic, teratogenic, and mutagenic substances. At the same time, they generally have a low vapor pressure, which causes them to be easily volatilized into the atmosphere and cause harm to the environment and human health. In the latest list of 188 "Hazardous Air Pollutants" identified by the US Environmental Protection Agency, there are 32 halogenated VOCs. On the waste gas "black list" announced by the European Community, halogenated substances and their derivatives are ranked first. Among the 68 priority pollutants proposed by my country in 1989, 25 are chlorinated hydrocarbons. [0003] Because the volatilization of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCB01D53/1487B01D53/1493B01D53/1425B01D2252/504B01D2257/2064
Inventor 张明美刘洋王新赵磊刘忠生
Owner CHINA PETROLEUM & CHEM CORP