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Nitrogen-doped active carbon catalyzer and application thereof in chloroethylene synthesis

A technology of activated carbon and nitrogen doping, which is applied in the field of activated carbon catalysts, can solve environmental pollution and other problems, and achieve the effect of high conversion rate of acetylene and good catalytic performance

Inactive Publication Date: 2015-04-22
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

[0006] The purpose of the present invention is to provide a nitrogen-doped activated carbon catalyst and its application in the synthesis of vinyl chloride to solve the technical problem that the catalyst in the acetylene hydrochlorination reaction in the prior art pollutes the environment seriously

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 3.0g of imidazole and add 75ml of deionized water to dissolve in a beaker, weigh 60g of coconut shell-based activated carbon and add it to the imidazole solution, soak it at 25°C for 5 hours, dry the impregnated activated carbon at 120°C for 10 hours, after drying The activated carbon was calcined at 600°C for 6 hours under a nitrogen atmosphere to obtain a nitrogen-doped activated carbon catalyst. Using the obtained nitrogen-doped activated carbon catalyst to catalyze the reaction of acetylene and hydrogen chloride to synthesize vinyl chloride, the reaction temperature is 180°C, the space velocity is 30 / h, the conversion rate of acetylene is 60.5%, and the selectivity of vinyl chloride is 98.5%.

Embodiment 2

[0027] Weigh 30.0g of polyacrylamide and add 200ml of deionized water to dissolve in a beaker, weigh 60g of coal-based activated carbon and add it to the polyacrylamide solution, soak it at 20°C for 12 hours, and dry the impregnated activated carbon at 120°C for 12 hours , the dried activated carbon was calcined at 600° C. for 7 hours under a nitrogen atmosphere to obtain a nitrogen-doped activated carbon catalyst. Using the obtained nitrogen-doped activated carbon catalyst to catalyze the reaction of acetylene and hydrogen chloride to synthesize vinyl chloride, the reaction temperature is 180°C, the space velocity is 20 / h, the conversion rate of acetylene is 90.5%, and the selectivity of vinyl chloride is 98.6%.

Embodiment 3

[0029] Weigh 7.5g of pyridine and add 60ml of deionized water to dissolve in a beaker, weigh 50g of coal-based activated carbon and add it to the pyridine solution, soak it at 0°C for 24 hours, dry the impregnated activated carbon at 140°C for 6 hours, and the dried Activated carbon was calcined at 800° C. for 4 hours under a nitrogen atmosphere to obtain a nitrogen-doped activated carbon catalyst. Using the obtained nitrogen-doped activated carbon catalyst to catalyze the reaction of acetylene and hydrogen chloride to synthesize vinyl chloride, the reaction temperature is 150°C, the space velocity is 10 / h, the conversion rate of acetylene is 88.5%, and the selectivity of vinyl chloride is 98.8%.

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Abstract

The invention discloses a nitrogen-doped active carbon catalyzer and application of the nitrogen-doped active carbon catalyzer in chloroethylene synthesis. The preparation method of the nitrogen-doped active carbon catalyzer comprises the following steps that a nitrogen-containing compound is dissolved in water to obtain a nitride solution, then active carbon is added in the nitride solution to be dipped, at last the dipped active carbon is dried completely and calcined in nitrogen, and the nitrogen-doped active carbon catalyzer is prepared. Additionally, the active carbon can be placed in a tube furnace, nitrogen is pumped in the tube furnace at high temperature, and the nitrogen-doped active carbon catalyzer is prepared. The nitrogen-doped active carbon catalyzer has a good catalytic performance in catalyzing ethyne and chlorine hydride to react with each other to synthesize chloroethylene. The catalyzer is more environmental friendly than an active carbon catalyzer carrying metal ions in the prior art.

Description

technical field [0001] The invention relates to an active carbon catalyst in acetylene hydrochlorination, in particular to a nitrogen-doped active carbon catalyst and its application in the synthesis of 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 key technology of polyvinyl chloride synthesis is the synthesis of vinyl chloride monomer. The earliest industrialization of the production of vinyl chloride monomer is the process technology of addition reaction of acetylene and hydrogen chloride gas under the action of activated carbon-supported mercuric chloride catalyst. Because the process uses mercuric chloride as a catalyst, there is a serious problem of mercury pollution. After the oil cracking process matured, foreign countries switched to the ethylene method to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C21/06C07C17/08
Inventor 姜标沈兆兵
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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