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Mercury-free catalyst for use in production of chloroethylene by calcium carbide method

A mercury catalyst and vinyl chloride technology, applied in the field of mercury-free catalysts, can solve problems such as reducing mercury supply and demand, and achieve the effects of low cost, high activity and selectivity

Inactive Publication Date: 2011-07-20
李伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the future, there will be serious problems of reducing mercury supply and demand in my country and the problem of mercury waste disposal in export trade. In the future, we will still face the pressure of implementing international conventions. If we do not pay attention to and strengthen the control and management of mercury pollution early, it will inevitably lead to a passive situation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] First weigh 2.2g of bismuth trichloride and dissolve it in 11.4g of deionized water, add a few drops of concentrated hydrochloric acid until the solution becomes transparent, stir and dissolve, then vacuum impregnate the solution into 11.5g of activated carbon. Then the activated carbon loaded with bismuth chloride was dried at 120 °C, and then reduced with hydrogen at 400 °C for 3 hours, and dropped to room temperature in a hydrogen atmosphere, and then in 0.5% O 2 / N 2 The precursor was obtained by passivating in medium for 2 hours; finally, 10 g of BaCl2 solution with a concentration of 5% was vacuum-impregnated into the precursor, and the obtained sample was named A after drying at 120°C. Catalyst A is used in the reaction of preparing vinyl chloride by hydrochlorination of acetylene, the conversion rate of acetylene is 89%, and the selectivity of vinyl chloride is 83%.

Embodiment 2

[0012] The preparation process is the same as that of catalyst A, except that the amount of bismuth trichloride is changed to 12.3 g, and other conditions remain unchanged, and the obtained sample is named B. Catalyst B is used in the reaction of preparing vinyl chloride by hydrochlorination of acetylene, the conversion rate of acetylene is 93%, and the selectivity of vinyl chloride is 91%.

Embodiment 3

[0014] The preparation process is the same as that of Catalyst A, except that the hydrogen reduction temperature is changed to 300°C, and other conditions remain unchanged. The obtained sample is named C. Catalyst C is used in the reaction of preparing vinyl chloride by hydrochlorination of acetylene, the conversion rate of acetylene is 90%, and the selectivity of vinyl chloride is 88%.

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Abstract

The invention provides a mercury-free catalyst for use in production of chloroethylene by a calcium carbide method. A supported mercury-free catalyst of which the metal bismuth simple substance is used as an active ingredient is prepared from bismuth trichloride serving as a raw material and active carbon serving as a carrier by the reduction of hydrogen; and the novel mercury-free catalyst with high activity and stability can be obtained by adding an aid. The mercury-free catalyst has the advantages of safety, no toxicity, environmental protection, low cost and the like, has the high activity and selectivity in a reaction for forming the chloroethylene by the hydrochlorination of acetylene, and can be used as an excellent substitute of a mercury-containing catalyst.

Description

technical field [0001] The invention proposes a mercury-free catalyst for producing vinyl chloride by a calcium carbide method. The catalyst uses bismuth trichloride as a raw material, activated carbon as a carrier, and obtains a supported mercury-free catalyst with metal bismuth as an active component through hydrogen reduction; by adding additives, a new type of mercury-free catalyst with high activity and high stability can be obtained; The catalyst designed by the invention has the advantages of safety, non-toxicity, environmental protection, low cost and the like. The catalyst exhibits high activity and selectivity in the preparation of vinyl chloride by hydrochlorination of acetylene, and can be regarded as an excellent substitute for mercury-containing catalysts. Background technique [0002] Polyvinyl chloride (PVC) is one of the five general-purpose resins in synthetic resins, a pillar product for the sustainable development of the chlor-alkali industry, and one of...

Claims

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Application Information

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IPC IPC(8): B01J23/18C07C21/06C07C17/08
Inventor 李伟段琼关庆鑫
Owner 李伟
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