Method for refining hydrochloric acid as byproduct in procedure for producing chemical products of chlorinated hydrocarbons

A technology for chemical products and by-product hydrochloric acid, which is applied in the direction of chlorine/hydrogen chloride, chlorine/hydrogen chloride purification, etc., can solve the problems of limited application and no relevant reports, and achieve the effect of broadening the application range and improving economic value

Active Publication Date: 2005-01-12
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process of organic chemical products such as chlorinated benzene, dichlorobenzene, trichlorobenzene, benzyl chloride, benzyl dichloride, and trichloroethylene, a large amount of by-product hydrochloric acid is generated, and the concentration of these hydrochloric acids is about 25-35%. The color is slightly yellow, and it contains organic impurities such as benzene, toluene, chlorinated benzene, benzyl chloride and trichloroethylene, which limits its application in industrial production
[0003] Literature search shows that most foreign reports use activated carbon to treat by-product hydrochloric acid, and domestic reports use distillation to separate organic matter in industrial wastewater containing hydrogen chloride, but for the removal of macroporous adsorption resins for organic matter in by-product hydrochloric acid, both at home and abroad are still unreliable. No relevant reports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Put 10ml (about 7 grams in mass) of CHA-111 (produced by Zhenxing Chemical Factory in Changzhou, Jiangsu, the same below) resin into a jacketed glass adsorption column (1.2cm×30cm). The industrial by-product hydrochloric acid in the production process of chlorinated benzene contains 196 mg / L of benzene, 30.9 mg / L of chlorinated benzene, and 3.88 mg / L of dichlorobenzene, with a slightly yellow color and 31% HCl content. At room temperature (25° C.), it was passed through the resin bed at a flow rate of 50 ml / h. When the treatment volume was 1000mL, the by-product hydrochloric acid after adsorption was colorless and transparent, the concentrations of benzene and chlorinated benzene were 0.5mg / L and 0.2mg / L respectively, and dichlorobenzene was not detected.

[0016] Use 100ml of absolute ethanol as a desorbing agent to elute the above-mentioned resin bed at a flow rate of 10ml / h at 55°C, and the ethanol desorption solution can recover ethanol through rectification. Afte...

Embodiment 2

[0018] The resin adsorption device is the same as in Example 1, and is replaced with NDA-150 resin (produced by Jiangsu Nanda Gede Environmental Protection Technology Co., Ltd., the same below), and the concentrations of benzene, chlorobenzene and dichlorobenzene are respectively 204mg / L and 220mg / L and 132mg / L by-product hydrochloric acid pass through the resin bed at a flow rate of 100ml / h at room temperature. When the processing capacity is 2000ml, the concentrations of benzene and chlorobenzene in the effluent are 0.6mg / L and 0.08mg / L respectively , dichlorobenzene was not detected.

[0019] At 60°C, use 140ml of absolute ethanol to elute the resin bed at a flow rate of 10ml / h. The eluent peak appears in the first 60ml, and its elution volume accounts for more than 95% of the total elution volume. The liquid can be rectified to separate and recover ethanol, benzene, and chlorobenzene, and the remaining part of the eluate can be used for the next elution. The eluted resin...

Embodiment 3

[0021] Put 10ml (about 7 grams in mass) of CHA-111 resin into a jacketed glass adsorption column (1.2cm×30cm). The industrial by-product hydrochloric acid in the production process of chlorinated benzene contains 196 mg / L of benzene, 30.9 mg / L of chlorinated benzene, and 3.88 mg / L of dichlorobenzene, with a slightly yellow color and 31% HCl content. At room temperature (25° C.), it was passed through the resin bed at a flow rate of 50 ml / h. When the treatment volume was 1000mL, the by-product hydrochloric acid after adsorption was colorless and transparent, the concentrations of benzene and chlorinated benzene were 0.5mg / L and 0.2mg / L respectively, and dichlorobenzene was not detected.

[0022] At 45°C, use 140ml of absolute ethanol to elute the resin bed at a flow rate of 10ml / h. The eluent peak appears in the first 80ml, and its elution volume accounts for more than 95% of the total elution volume. The liquid can be rectified to separate and recover methanol, benzene, and ...

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PUM

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Abstract

The method includes following steps, (A) adsorption: to filter industrial by-product hydrochoric acid containing organic substances (benzene, methylbenene, chlorobenzene and triclene etc.) from tens to hundreds, the organic substance in the by-product hydrochoric acid is absorbed on resin by adsorption tower filled with phenylethene and styrene-divinglbenzene large aperture adsorbing resin, the by-product hydrochoric acid being absorbed is colourless and transparent, the content of organic substance can be reduced below 1 mg/L. (B) deadsorption; to do deadsorption and regeneration to the larger aperture adsorbing resin which absorbed organic substances during step A that water vapour is used as absorbent agent, the deadsorption temp. is 110-150 deg.C, the time is 2-16 hrs, (C) recovery: to recover the organic substances by gas and liquid deadsorption, oil and water sepaation, the water phase is returned to hydrogen chloride adsorption process to be used generating by-product hydrochloric acid.

Description

1. Technical field [0001] The invention relates to a method for refining industrial hydrochloric acid containing chlorinated hydrocarbon organic impurities, specifically, refers to organic chemical The refining method of industrial by-product hydrochloric acid generated in the production process of the product. 2. Background technology [0002] Hydrochloric acid is an important chemical product. Industrial hydrochloric acid is mostly prepared by reacting hydrogen and chlorine and absorbing water. In the production process of organic chemical products such as chlorinated benzene, dichlorobenzene, trichlorobenzene, benzyl chloride, benzyl dichloride, and trichloroethylene, a large amount of by-product hydrochloric acid is generated, and the concentration of these hydrochloric acids is about 25-35%. The color is yellowish, and it contains organic impurities such as benzene, toluene, chlorinated benzene, benzyl chloride and trichloroethylene, which limits its application in ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07
Inventor 张全兴张虹戴建庭李爱民陈金龙吴建民王海玲叶必华龙超潘丙才
Owner NANJING UNIV
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