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Novel mercury-free catalyst and application of mercury-free catalyst in synthesis of vinyl chloride

A technology of mercury catalyst and vinyl chloride, which is applied in the field of new mercury-free catalyst and its application in the synthesis of vinyl chloride, can solve environmental pollution and other problems, and achieve good catalytic performance

Active Publication Date: 2015-01-21
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new type of mercury-free catalyst and its application in the synthesis of vinyl chloride, to solve the technical problem that the acetylene process generally uses a loaded mercury chloride catalyst in the prior art and causes serious environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 2.5g of acrylamide and add 60ml of deionized water to dissolve in a beaker, weigh 50g of coal-based activated carbon treated with hydrochloric acid and add it to the acrylamide solution, soak it at 25°C for 2 hours, and dry the impregnated activated carbon at 60°C for 24 Hours, the dried activated carbon was calcined at 600°C under a nitrogen atmosphere for 6 hours to obtain a new nitrogen-doped mercury-free catalyst. Using this catalyst to catalyze 1,2-dichloroethane and acetylene to synthesize vinyl chloride, the reaction temperature is 230°C, the space velocity is 30 / h, the conversion rate of dichloroethane is 93.5%, the conversion rate of acetylene is 85.3%, and the total selectivity is 98.5%. .

Embodiment 2

[0018] Weigh 2.0g of ammonia water (25%) and add 60ml of deionized water to dissolve in a beaker, weigh 50g of hydrochloric acid-treated coconut shell activated carbon and add it to the dilute ammonia solution, soak for 1 hour at 25°C, and place the soaked activated carbon at 80°C The dried activated carbon was dried at 400°C for 8 hours under a nitrogen atmosphere to obtain a new nitrogen-doped mercury-free catalyst. Using this catalyst to catalyze 1,2-dichloroethane and acetylene to synthesize vinyl chloride, the reaction temperature is 250°C, the space velocity is 15 / h, the conversion rate of dichloroethane is 81.5%, the conversion rate of acetylene is 65.3%, and the total selectivity is 98.3%. .

Embodiment 3

[0020] Weigh 7.5g of pyridine and add 60ml of deionized water to dissolve in a beaker, weigh 50g of hydrochloric acid-treated coal-based activated carbon and add it to the pyridine solution, soak at 0°C for 24 hours, and dry the impregnated activated carbon at 140°C for 6 hours. The dried activated carbon was calcined at 800°C for 4 hours under a nitrogen atmosphere to obtain a new nitrogen-doped mercury-free catalyst. Using this catalyst to catalyze the synthesis of vinyl chloride from 1,2-dichloroethane and acetylene, the reaction temperature is 240°C, the space velocity is 100 / h, the conversion rate of dichloroethane is 70.5%, the conversion rate of acetylene is 61.6%, and the total selectivity is 97.9%. .

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Abstract

The invention discloses a novel mercury-free catalyst, and application of the mercury-free catalyst in synthesis of vinyl chloride. The novel mercury-free catalyst is prepared by a method comprising the steps of pickling and drying active carbon, and then taking the active carbon as a carrier for later use; dissolving a nitrogen-containing compound in deionized water so as to prepare impregnation liquid, wherein the nitrogen-containing compound is selected from one or several of ammonia water, ammonia gas, pyridine, pyrrole, imidazole, acrylamide, polyacrylamide and polyvinylpyrrolidone; adding the pickled active carbon into the impregnation liquid containing the nitrogen-containing compound, and impregnating, wherein the content of the nitrogen-containing compound and the active carbon is 0.01-20% by weight part; and completely drying the impregnated active carbon at 60-140 DEG C, then calcining the active carbon at 400-800 DEG C for 4-6 hours in the nitrogen atmosphere to prepare the novel mercury-free catalyst. The prepared catalyst shows good catalytic performance in the aspect of catalyzing the reaction of synthesis of vinyl chloride by 1,2-dichloroethane and acetylene.

Description

technical field [0001] The invention relates to a novel catalyst for synthesizing vinyl chloride, in particular to a novel mercury-free catalyst and its application in synthesizing vinyl chloride. Background technique [0002] Polyvinyl chloride (PVC) is the second largest general-purpose resin in the world, and its output is only lower than that of polyethylene (PE). The world's annual production exceeds 40 million tons. [0003] The earliest synthesis method of polyvinyl chloride is the acetylene method, that is, under the catalysis of mercuric chloride, acetylene and hydrogen chloride are added to synthesize vinyl chloride, and vinyl chloride is polymerized to obtain polyvinyl chloride. Due to the use of mercuric chloride as a catalyst in this method, there is a serious problem of mercury pollution. After the process of producing ethylene from petroleum cracking matured, foreign countries switched to ethylene to produce vinyl chloride, and in the 1980s, the process of pr...

Claims

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Application Information

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IPC IPC(8): B01J27/24C07C21/06C07C17/25C07C17/08
Inventor 姜标沈兆兵王雯娟
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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