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Catalyst used in low-temperature removal of hydrogen chloride from dichloroethane for preparation of vinyl chloride, and preparation method and application thereof

A technology for dehydrochlorination and dichloroethane, applied in the direction of dehydrohalogenation preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of difficult catalyst life, low dehydrochlorination activity, low activity, etc., to achieve Effects of reducing carbon deposition and coking, increasing catalyst life, and reducing cracking temperature

Active Publication Date: 2016-10-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The activity of the above two catalysts to catalyze the cracking and dehydrochlorination of dichloroethane is still low, especially at low temperature. Although the activity is high at high temperature, the catalyst life is difficult to guarantee.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Test of blank activated carbon as a catalyst to catalyze the low temperature dehydrochlorination of dichloroethane (reference)

[0027] In the equipment, the reaction conditions are reaction temperature 250°C, normal pressure, dichloroethane mass space velocity 0.2h -1 , the cracking conversion rate of dichloroethane is 5%, the selectivity of producing vinyl chloride is greater than 99.3%, and the activity has no obvious change in the 180h continuous reaction.

Embodiment 2

[0029] A preparation method for a catalyst for preparing vinyl chloride by low-temperature dehydrochlorination of ethylene dichloride, comprising the steps of:

[0030] (1) 20g of urea, 200g of methanol and 10g of activated carbon were impregnated with sealing and stirring at 30°C for 12h, evaporated to dryness and recovered the solvent;

[0031] (2) Put the product obtained in step (1) into a tube furnace, raise the temperature to 700°C at a rate of 10°C / min under a nitrogen atmosphere, keep it for 6h, and cool to room temperature to obtain a compound for dichloroethane Catalyst for preparing vinyl chloride by dehydrochlorination at low temperature.

[0032] In the equipment, the reaction conditions are reaction temperature 250°C, normal pressure, dichloroethane mass space velocity 0.2h -1 , The cracking conversion rate of dichloroethane is 40%, the selectivity of producing vinyl chloride is greater than 99.5%, and the activity has no obvious change in the 180h continuous re...

Embodiment 3

[0034] A preparation method for a catalyst for preparing vinyl chloride by low-temperature dehydrochlorination of ethylene dichloride, comprising the steps of:

[0035] (1) 0.1 g of melamine, 20 g of ethanol and 10 g of activated carbon were impregnated with sealing and stirring at 100° C. for 1 h, evaporated to dryness and recovered the solvent;

[0036] (2) Put the product obtained in step (1) into a muffle furnace, raise the temperature to 300°C at a rate of 1°C / min under an argon atmosphere, keep it for 0.5h, and cool to room temperature to obtain a Catalyst for preparing vinyl chloride by low-temperature dehydrochlorination of ethane;

[0037] The reaction conditions are reaction temperature 200°C, 0.2MPa, dichloroethane mass space velocity of 0.3h -1 , the cracking conversion rate of dichloroethane is 43%, the selectivity of producing vinyl chloride is greater than 99.5%, and the activity has no obvious change in the 180h continuous reaction. Compared with the blank ac...

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Abstract

The invention discloses a catalyst used in low-temperature removal of hydrogen chloride from dichloroethane for preparation of vinyl chloride, and a preparation method and application thereof. The preparation method for the catalyst comprises the following steps: (1) subjecting a precursor, a solvent and active carbon to stirring and impregnation at 30 to 100 DEG C for 1 to 12 h and then evaporating the solvent to dryness; and (2) putting a product of the step (1) into a heating furnace, carrying out heating to 300 to 1000 DEG C in an inert gas atmosphere at a heating rate of 1 to 10 DEG C / min, maintaining the product at the temperature for 0.5 to 6 h and then cooling the product to room temperature. With the catalyst provided by the invention, pyrolysis temperature of dichloroethane is greatly reduced, so energy consumption is reduced, carbon formation and coking of a reactor are alleviated, and the service life of the catalyst is prolonged; and in catalysis of removal of hydrogen chloride from dichloroethane for preparation of vinyl chloride, the pyrolysis conversion rate of dichloroethane is 91%, produced vinyl chloride has selectivity of 99.5% or above, and the activity of the catalyst has no obvious change in the reaction having lasted for 180 h.

Description

technical field [0001] The invention relates to a preparation method and application of a catalyst used for low-temperature dehydrochlorination of dichloroethane to prepare vinyl chloride. It belongs to the preparation technology and application scope of catalysts for organic synthesis. Background technique [0002] With the development of the national economy, the improvement of people's living standards and the improvement of environmental protection awareness, the demand for PVC (polyvinyl chloride) is increasing. PVC is obtained by polymerization of VCM (vinyl chloride monomer). The production methods of VCM mainly include ethylene process, ethane process and acetylene process. Preparation of PVC by ethylene method, as a technologically mature process route, has always been the mainstream PVC production process in the world, especially in developed countries and countries rich in oil resources. The ethylene production process uses the petrochemical product ethylene as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C17/25C07C21/06
Inventor 张金利赵伟李韡
Owner TIANJIN UNIV
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