Catalyst used for one-step preparation of vinyl chloride from dichloroethane and acetylene, and preparation method and application thereof

A technology of ethylene dichloride and vinyl chloride is applied in the field of catalyst for preparing vinyl chloride by one-step method of ethylene dichloride and acetylene, and the field of preparation and application, which can solve the problems to be improved, the activity needs to be improved, and the like, so as to reduce carbon deposition. and coking, prolong life and reduce energy consumption

Active Publication Date: 2017-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the activity of these catalysts for the one-step preparation of vinyl chloride from ethylene dichloride and acetylene still needs to be improved, especially at low temperatures.

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 reaction of dichloroethane and acetylene to prepare vinyl chloride in one step (reference)

[0027] The reaction conditions are reaction temperature 250°C, normal pressure, the ratio of acetylene to dichloroethane is 1:1, and the space velocity of acetylene is 36h -1 Under the conditions, the conversion rate of acetylene is 1%, 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 kind of preparation method of the catalyst that is used for dichloroethane and acetylene one-step method to prepare vinyl chloride, comprises the steps:

[0030] (1) 0.1g of urea, 10g of activated carbon and 20g of methanol were sealed and impregnated 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 nitrogen-doped activated carbon carrier, referred to as N-AC;

[0032] (3) Immerse N-AC in an aqueous solution of ruthenium trichloride with a mass concentration of 0.05% by an equal-volume impregnation method, evaporate the water to dryness in a 50°C water bath, and then dry it in an oven at 150°C to obtain dichloroethane and A catalyst for the one-step preparation of vinyl chloride from acetylene.

[0033] The reaction conditions are reaction tem...

Embodiment 3

[0035] A kind of preparation method of the catalyst that is used for dichloroethane and acetylene one-step method to prepare vinyl chloride, comprises the steps:

[0036] (1) 0.1 g of melamine, 10 g of activated carbon and 20 g of ethanol were impregnated with sealing and stirring at 100° C. for 1 h, evaporated to dryness and recovered the solvent;

[0037] (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 N-AC;

[0038] (3) Immerse N-AC in an aqueous solution of ruthenium trichloride with a mass concentration of 0.1% by an equal-volume impregnation method, evaporate the water in a water bath at 60°C, and then dry it in an oven at 100°C to obtain dichloroethane and A catalyst for the one-step preparation of vinyl chloride from acetylene.

[0039] The reaction conditions are reaction temperature 200°C, 0.2MPa, and acetylene space...

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PUM

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Abstract

The invention discloses a catalyst used for one-step preparation of vinyl chloride from dichloroethane and acetylene, and a preparation method and application thereof. The preparation method for the catalyst comprises the following steps: (1) subjecting a nitrogen-containing precursor, active carbon and a solvent to stirring and impregnation at 30 to 100 DEG C for 1 to 12 h and then evaporating the solvent to dryness; (2) putting a product obtained in the step (1) into a heating furnace, carrying out heating to 300 to 1, 000 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 so as to obtain a nitrogen-doped active carbon carrier N-AC; and (3) impregnating N-AC with an aqueous solution of ruthenium trichloride by using an equivalent-volume impregnation, carrying out water-bath drying and then carrying out stoving so as to obtain the catalyst used for one-step preparation of vinyl chloride from dichloroethane and acetylene. The catalyst is used for catalyzing a one-step reaction of dichloroethane with acetylene for preparation of vinyl chloride, so activity is improved, reaction temperature and energy consumption are lowed, coking and carbon formation of a reactor are reduced, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to a preparation method and application of a catalyst used for the one-step preparation of vinyl chloride from ethylene dichloride and acetylene. 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 a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C17/25C07C17/08C07C21/06
Inventor 张金利赵伟李韡韩优付雁
Owner TIANJIN UNIV
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