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Separation and purification method of mixed waste gas containing chlorine and hydrogen chloride

A purification method and technology of hydrogen chloride gas, applied in the direction of chlorine/hydrogen chloride purification, chlorine/hydrogen chloride, etc., can solve the problems of low economic value of treatment and recovery, complicated equipment, long treatment process, etc., and achieve low cost, low treatment cost, The effect of obvious economic benefits

Inactive Publication Date: 2006-11-22
ZHEJIANG WEIHUA CHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The disadvantage of this patent is that the treatment process is long, the equipment is complicated, and the economic value of treatment and recovery is not high

Method used

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  • Separation and purification method of mixed waste gas containing chlorine and hydrogen chloride
  • Separation and purification method of mixed waste gas containing chlorine and hydrogen chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0038]The separation and purification device of the present invention is mainly composed of the following equipment: a chlorine gas absorption tower, which is a packed tower made of carbon steel and filled with Raschig ring packing made of carbon steel. Waste gas enters from the bottom of the tower, and the absorbed gas escapes from the top of the tower. The solvent A cooled by the condenser is sprayed from the upper part of the tower and contacted with the exhaust gas countercurrently, and the absorbed liquid enters the circulation tank from the bottom of the tower; the chlorine gas desorption tower is a packed tower made of carbon steel, and the upper part of the tower body It is a shell and tube condenser with a carbon steel Raschig ring packing in the middle. The gas phase heated by the desorption kettle enters the lower part of the desorption tower. After desorption, the gas escapes from the top of the tower, and the solvent A after absorbing chlorine is sprayed from the mi...

Embodiment 2

[0041] The mixed waste gas containing chlorine and hydrogen chloride is composed of: 80% by weight of hydrogen chloride, 19.8% by weight of chlorine gas, and 0.2% by weight of organic matter. In the packed absorption tower, carbon tetrachloride solvent is used to absorb chlorine in the waste gas, and the addition of solvent carbon tetrachloride The amount is 10% excess after ensuring that all the chlorine in the mixed exhaust gas is absorbed, and the absorption temperature is less than 15°C. After absorbing the chlorine gas, the carbon tetrachloride solvent is heated to 70°C in the desorption tower to desorb the chlorine gas to obtain chlorine gas with a purity of 99%, and the chlorine gas can be returned to the system for recycling. The mixed gas of hydrogen chloride gas and carbon tetrachloride solvent that escapes from the top of the tower is further removed in the secondary packing absorption tower with hexachlorobutadiene solvent in the mixed gas of carbon tetrachloride so...

Embodiment 3

[0043] The mixed waste gas containing chlorine and hydrogen chloride is composed of: 50% by weight of hydrogen chloride, 49.5% by weight of chlorine, and 0.5% by weight of organic matter. The chlorine in the waste gas is absorbed by benzene solvent in the packed absorption tower, and the amount of solvent benzene is ensured in the mixed waste gas. After all the chlorine gas is absorbed, the excess is 10%, and the absorption temperature is less than 15°C. The benzene solvent after absorbing chlorine gas is heated to 75°C in the desorption tower to desorb chlorine gas to obtain chlorine gas with a purity of 99%, which can be returned to the system for recycling. The mixed gas of hydrogen chloride gas and benzene solvent escaped from the top of the tower is further removed by the hexachlorobutadiene solvent in the secondary packed absorption tower to remove the benzene solvent in the mixed gas, and the hydrogen chloride gas after preliminary purification is removed by washing with...

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Abstract

This invention relates to a method for separating and purifying mixing exhaust gas of chlorine and hydrochloride, comprising: absorb the chlorine in the mixing exhaust gas using solvent A to separate from gas phase hydrochloride, the chlorine can be obtained after solvent A desorption, the hydrochloride can be obtained by removing solvent A in the gas phage hydrochloride using solvent B, wherein: solvent A is one of benzene, silicon tetrachloride, nonyl hydride, sulfur monochloride, carbon tetrachloride and chlorosulfonic acid, and solvent B is one of cyclopentadiene and hexachlorobutadiene. By washing with concentrated hydrochloric acid to remove trace amount of organic compounds, and chemical washing to remove heavy metal elements, the hydrochloride is absorbed by water to make hydrochloric acid. This invention is characterized of efficient separation of chlorine and hydrochloride, high efficiency of separation, low cost, high-usage of resources, high purity of chlorine up to 99%, recycling use, and the purity of hydrochloride meets the requirement of producing industrial hydrochloride and hydrochloride regent .

Description

technical field [0001] The invention relates to a method for separating and purifying the mixed waste gas of chlorine and hydrogen chloride, in particular to a method for separating and purifying the mixed waste gas containing chlorine and hydrogen chloride produced in the chlorination process of aromatic hydrocarbons. Background technique [0002] The main source of chlorine-containing waste gas is the production plant and use plant of chlorine gas. Chlor-alkali plants, organochlorine pesticides and pharmaceutical synthesis enterprises, inorganic chlorine production enterprises such as hydrochloric acid or bleaching powder, plastics and many solvent production enterprises all produce chlorine-containing waste gas to varying degrees. [0003] Since chlorine gas and hydrogen chloride gas are very harmful to human health and have serious damage to animals, plants and various utensils, process equipment should be improved in industrial production to minimize the emission of chl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07
Inventor 李惠跃
Owner ZHEJIANG WEIHUA CHEMICAL CO LTD
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