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Method for regenerating precious-metal mercury-free catalyst for acetylene hydrochlorination

A technology of acetylene hydrochlorination and mercury catalyst, which is applied in catalyst regeneration/reactivation, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problems of few research reports, achieve low operating cost, restore activity, prolong The effect of the service life

Inactive Publication Date: 2017-05-31
XINJIANG CORPS MODERN GREEN CHLOR ALKALI CHEM ENG RES CENT LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to its high activity, good stability and excellent overall performance, noble metal mercury-free catalysts have become a hot spot in the research and development of mercury-free catalysts for acetylene hydrochlorination. Many domestic enterprises, universities and research institutes have invested in research and development in this field However, the cost of expensive precious metals has become the bottleneck of the industrial application of precious metal mercury-free catalysts; therefore, regeneration of deactivated noble metal mercury-free catalysts can restore the activity to a certain extent, prolong the service life of the catalyst, and reduce the The overall cost appears to be particularly necessary
[0004] At present, there are few domestic research reports on the regeneration of noble metal mercury-free catalysts deactivated by acetylene hydrochlorination

Method used

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  • Method for regenerating precious-metal mercury-free catalyst for acetylene hydrochlorination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 10 g of the above-mentioned deactivated mercury-free catalyst and put it in a beaker, take 0.25 g of potassium thiocyanate and dissolve it in 20 ml of water, soak the deactivated catalyst in the potassium thiocyanate solution for 12 hours; dry at 120°C. Evaluations were performed on a fixed-bed microreactor.

Embodiment 2

[0016] Take 10 g of the above deactivated mercury-free catalyst and put it in a beaker, take 0.50 g of thiourea and dissolve it in 20 ml of water, soak the deactivated catalyst in the thiourea solution for 8 hours; dry at 120°C. Evaluations were performed on a fixed-bed microreactor.

Embodiment 3

[0018] Take 10 g of the above-mentioned deactivated mercury-free catalyst and put it in a beaker, take 0.40 g of dichloroacetonitrile sodium urate and dissolve it in 20 ml of water, soak the deactivated catalyst in the dichloroacetonitrile sodium urate solution for 16 hours; dry at 120°C. Evaluations were performed on a fixed-bed microreactor.

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Abstract

The invention discloses a method for regenerating a precious-metal mercury-free catalyst for acetylene hydrochlorination. The method comprises the following steps: (1) carrying out drying treatment; (2) carrying out treatment by using regeneration reagents such as an acid mixture of hypochlorous acid, chloric acid, perchloric acid, hydrogen peroxide and hydrochloric acid, formic acid, acetic acid and tartaric acid; and (3) carrying out water washing and baking. According to the method, the performance of the deactivated precious-metal mercury-free catalyst can be restored, and the precious-metal mercury-free catalyst can be recycled, so that the use cost is greatly reduced; and the implementation process is environmentally friendly, so that a foundation is laid for non-mercurization of calcium-carbide-process PVC industry.

Description

technical field [0001] The invention belongs to the field of catalyst regeneration, and in particular relates to a method for regeneration of a noble metal mercury-free catalyst for acetylene hydrochlorination. Background technique [0002] Vinyl chloride monomer is an important synthetic raw material for polyvinyl chloride, polyvinyl chloride is one of the synthetic resins with the largest consumption and output in my country, and the basic national conditions of our country with more coal and less oil determine that the production of PVC by calcium carbide method still occupies a dominant position in our country . The main problems faced by calcium carbide synthesis of PVC are the environmental pollution caused by the use of mercury catalysts and the massive consumption of mercury resources. In response to the problem of mercury pollution in the calcium carbide PVC industry, the Ministry of Industry and Information Technology and the Ministry of Environmental Protection ha...

Claims

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Application Information

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IPC IPC(8): B01J38/48B01J38/50B01J38/52B01J27/122
Inventor 郑伟玲陈万银李春华王小昌李国栋周军唐彬赵忠峰李静
Owner XINJIANG CORPS MODERN GREEN CHLOR ALKALI CHEM ENG RES CENT LTD
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