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Method for separating and extracting hydrogen chloride from byproducts containing hydrogen chloride

A technology of hydrogen chloride and by-products, applied in the direction of chlorine/hydrogen chloride purification, chlorine/hydrogen chloride, etc., can solve the problem of not being able to obtain hydrogen chloride, and achieve a reasonable process effect

Inactive Publication Date: 2012-03-28
TIANJIN TAIYUAN INDAL GAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the present invention is to overcome the deficiencies of the prior art. The prior art cannot obtain hydrogen chloride. The production efficiency will be greatly improved by adopting this method. This method provides a kind of equipment and process

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  • Method for separating and extracting hydrogen chloride from byproducts containing hydrogen chloride

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Embodiment 1

[0039] When organics are chlorinated, gaseous by-products containing HCl can be formed. For example, in the process of chlorination of methane to produce methyl chloride:

[0040] CH4+3Cl 2 →CHCl3+3HCl

[0041] Another example, when chlorination of benzene produces chlorinated benzene:

[0042] C6H6+Cl 2 →C6H5Cl+HCl

[0043] C6H6+2Cl 2 →C6H4Cl2+2HCl

[0044] C6H6+3Cl 2 →C6H3Cl3+3HCl

[0045] Another example, in the process of oxychlorination to vinyl chloride, the pyrolysis of dichloroethane:

[0046] 2C2H4Cl 2 →2C2H3Cl+2HCl

[0047] And so on, almost all organic chlorination reactions produce by-products containing hydrogen chloride.

[0048] (1) Composition of raw materials

[0049] The crude hydrogen chloride produced from the above-mentioned various processes carries various impurities. Among them are unreacted chlorine and organic matter, impurities brought by reactants in the preparation of organic chlorides, and catalyst solid particles entrained.

[0050]...

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Abstract

The invention discloses a technology for separating and extracting hydrogen chloride from byproducts containing hydrogen chloride, which are generated by carrying out a chlorination reaction on organic matters. Because most of organic chlorides are insoluble in water or difficult to be dissolved in water, the hydrogen chloride and other components can be separated by using a water absorption method. The hydrogen chloride is absorbed from a mixed gas prepared by carrying out the chlorination reaction by using water or about 20% constant boiling hydrochloric acid. When the absorption temperature is about 50 DEG C, the 30-35% hydrochloric acid is prepared. If necessary, coarse hydrochloric acid is refined and then desorbed to obtain a hydrogen chloride gas and constant boiling acid. The hydrogen chloride is dried and then conveyed to a user, and the constant boiling acid is circulated into the absorption section. The technology disclosed by the invention is a simplest and most convenient ideal technology for preparing the hydrogen chloride and has the advantages of reasonable process and simpleness in preparation.

Description

technical field [0001] The invention relates to a chemical product, in particular to a technology for separating and extracting hydrogen chloride from by-products containing hydrogen chloride generated from the chlorination reaction of organic matter, and is suitable for producing hydrogen chloride. Background technique [0002] Hydrogen chloride is an important form of chlorine, and it is also a very important chemical product and raw material. Mainly used in the production of PVC, polyurethane, epoxy resin, silicone, synthetic rubber, chlorofluorocarbons, TiO2 coatings and some agricultural chemicals, building materials and some pharmaceutical preparations. [0003] When chemical production consumes a large amount of chlorine gas, it usually produces equimolar hydrogen chloride gas, so hydrogen chloride is a common by-product in industry. HCl is a cheap and difficult chemical to deal with. In the past, it was sold as hydrochloric acid by water absorption or neutralized wi...

Claims

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Application Information

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IPC IPC(8): C01B7/07
Inventor 原东凤
Owner TIANJIN TAIYUAN INDAL GAS