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Ethyne hydrochlorination precious metal mercury-free catalyst regeneration method

An acetylene hydrochlorination, mercury catalyst technology, applied in catalyst regeneration/reactivation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as few research reports, achieve low operating costs, prolong service life, The effect of simple operation process

Inactive Publication Date: 2017-04-26
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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  • Ethyne hydrochlorination precious metal mercury-free catalyst regeneration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 10 g of the above-mentioned deactivated catalyst and put it in a beaker, take 20 ml of hydrochloric acid and 2 ml of hydrogen peroxide, and drop them into the deactivated catalyst at the same time, soak for 20 hours; wash with deionized water until neutral, and dry at 120 ° C. Evaluations were performed on a fixed-bed microreactor.

Embodiment 2

[0020] Take 10 g of the above-mentioned deactivated catalyst and place it in a beaker, soak it in 25 ml of 30% hypochlorous acid for 15 hours; wash with deionized water until neutral, and dry at 120°C. Evaluations were performed on a fixed-bed microreactor.

Embodiment 3

[0022] Take 10 g of the above-mentioned deactivated catalyst and place it in a beaker, soak it in 40 ml of 60% formic acid for 25 hours; wash it with deionized water until neutral, and dry it at 120°C. Evaluations were performed on a fixed-bed microreactor.

[0023] The performance of the regenerated catalyst is as follows:

[0024] Table 1 Catalyst Comprehensive Performance Evaluation Table after Regeneration of Examples 1-3

[0025]

[0026] Note: The catalyst evaluation process is to use a fixed-bed micro-reactor for evaluation, electric furnace heating and temperature control, catalyst filling 2g, hydrogen chloride activation for 0.5h before the reaction, acetylene reaction after activation, and a thermal conductivity cell gas chromatograph. Gas analysis, sampling frequency times / 0.5h.

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Abstract

The invention discloses an ethyne hydrochlorination precious metal mercury-free catalyst regeneration method which includes the steps: first, performing drying treatment; second, performing soaking treatment by the aid of regenerated reagent bromine water, sodium thiosulfate, potassium thiocyanate, thiourea and the like; third, performing drying treatment to obtain a regenerated catalyst. The performance of the inactivated precious metal mercury-free catalyst can be restored, so that the precious metal mercury-free catalyst can be recycled, use cost is greatly reduced, and operation is simple.

Description

technical field [0001] The invention belongs to the field of catalyst regeneration for acetylene hydrochlorination, in particular 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 Environ...

Claims

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Application Information

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IPC IPC(8): B01J38/62B01J38/60B01J38/70
CPCB01J38/60B01J38/62B01J38/70
Inventor 陈万银郑伟玲轩卫华唐彬李春华李国栋周军
Owner XINJIANG CORPS MODERN GREEN CHLOR ALKALI CHEM ENG RES CENT LTD
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