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A nitrogen-modified catalyst for preparing vinyl chloride and its preparation method

A catalyst, nitrogen modification technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., can solve the problems of high cracking reaction temperature, coking, carbon deposition, etc. , to achieve the effect of simple preparation process, environmental friendliness and low cost

Active Publication Date: 2017-02-01
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

[0005] The purpose of the present invention is to provide a nitrogen-modified catalyst for the preparation of vinyl chloride and its preparation method to solve the problems of coking and carbon deposition caused by the high temperature of the dichloroethane cracking reaction in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve 7.5g of strontium chloride and 5g of cyanoacetamide in 150ml of deionized water to prepare an impregnation solution. 80g of coal-based activated carbon treated with hydrochloric acid was added to the prepared impregnating solution and mixed evenly, impregnated for 2 hours, and activated by passing nitrogen at a high temperature of 650°C for 6 hours to prepare a nitrogen-modified activated carbon catalyst supported by strontium metal. At normal pressure, the reaction temperature is 260°C, and the reaction space velocity is 78h -1 Under these conditions, the activity of the nitrogen-modified activated carbon catalyst was investigated for the cracking reaction of 1,2-dichloroethane. The conversion rate of 1,2-dichloroethane reaches over 45%, and the selectivity of vinyl chloride reaches over 95%.

Embodiment 2

[0023] Dissolve 7.5g of strontium chloride and 5g of cyanoacetamide in 150ml of deionized water to prepare an impregnation solution. Add 80 g of coal-based activated carbon treated with hydrochloric acid, mix evenly, impregnate for 6 hours, and activate with nitrogen at 650°C for 6 hours to prepare a nitrogen-modified activated carbon catalyst supported by strontium metal. At normal pressure, the reaction temperature is 220°C, and the reaction space velocity is 78h -1 Under these conditions, the activity of the nitrogen-modified activated carbon catalyst was investigated for the cracking reaction of 1,2-dichloroethane. The conversion rate of 1,2-dichloroethane reaches over 25%, and the selectivity of vinyl chloride reaches over 95%.

Embodiment 3

[0025] Dissolve 5g of strontium chloride and 5g of acrylamide in 100ml of deionized water to prepare an impregnation solution. Add 50 g of coal-based activated carbon treated with hydrochloric acid, mix evenly, impregnate for 4 hours, and activate with nitrogen gas at a high temperature of 650 ° C for 6 hours to prepare a nitrogen-modified activated carbon catalyst supported by strontium metal. At normal pressure, the reaction temperature is 280°C, and the reaction space velocity is 78h -1 Under these conditions, the activity of the nitrogen-modified activated carbon catalyst was investigated for the cracking reaction of 1,2-dichloroethane. The conversion rate of 1,2-dichloroethane reaches over 80%, and the selectivity of vinyl chloride reaches over 95%.

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Abstract

The invention discloses a nitrogen-modified catalyst applied to preparation of vinyl chloride and a preparation method of the nitrogen-modified catalyst. According to the nitrogen-modified catalyst, active carbon is used as a carrier, wherein the nitrogen-modified catalyst comprises a metal salt loaded compound and a nitrogen-containing compound; according to the total mass of the catalyst, the mass percentage of the metal salt compound is 0.01-10%, and the mass percentage of the nitrogen-containing compound is 0.01-10%. The metal salt compound is strontium salt or barium salt or mixture of the strontium salt and the barium salt; the nitrogen-containing compound is selected from at least one of guanidine hydrochloride, acetamidine hydrochloride, acrylamide, urea, methanesulfonamide and cyanoacetamide. The nitrogen-modified catalyst is applied to reaction of preparing vinyl chloride by catalytic cracking of 1,2-dichloroethane; not only is the cracking temperature reduced, and also the nitrogen-modified catalyst is high in conversion rate of 1,2-dichloroethane and selectivity of vinyl chloride, and is efficient, and has energy-saving and environment-friendly effects.

Description

technical field [0001] The invention relates to a catalyst for synthesizing vinyl chloride, in particular to a nitrogen-modified catalyst for preparing vinyl chloride and a preparation method thereof. Background technique [0002] Vinyl chloride is a very important chemical raw material, mainly used in the production of polyvinyl chloride resin. Polyvinyl chloride is one of the top five engineering plastics in the world and is widely used in various industries. At present, the industrial synthesis methods of vinyl chloride monomer mainly include acetylene hydrochlorination and ethylene oxychlorination. [0003] Ethylene oxychlorination is currently the most advanced process for the industrial production of vinyl chloride monomer, which is divided into three steps: (1) direct chlorination, that is, the reaction of ethylene and chlorine to generate dichloroethane; (2) dichloroethane Cracking of alkane, that is, thermal cracking of dichloroethane at high temperature to genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/26C07C21/06C07C17/25
Inventor 姜标王雯娟沈兆兵
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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