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Method for preparing chloroethylene by reaction of chloroform and acetylene, and catalyst used in method

A technology of catalysts and vinyl chloride, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve pollution, poisonous and other problems, and achieve the effect of simple process

Inactive Publication Date: 2015-03-25
YANGZHOU UNIV
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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 catalyst for the production of vinyl chloride by the reaction of chloroform and acetylene, so as to solve the problems of toxicity and pollution in the production of vinyl chloride in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1 kg FeCl 3 ·6H 2 O and 0.6 kg AlCl 3 ·6H 2O was added to 12 kg of water, stirred and dissolved to obtain a solution with a metal salt concentration of 0.52 mol / L, added with 10 kg of activated carbon, soaked at room temperature for 10 hours, filtered, dried at 110°C for 10 hours, and calcined at 400°C for 8 hours to obtain a metal-containing An acetylene hydrochlorination catalyst with 8% (mass content) of salt. Mix acetylene and tetrachloroethane gas and feed it into a fixed-bed catalyst reactor under the conditions of 200 °C and 0.1 MPa. The molar ratio of acetylene and tetrachloroethane gas is 1:1, and the space velocity of the reaction gas is 200 h. -1 , The conversion rate of acetylene is 54%, the selectivity of vinyl chloride is 97%, and the selectivity of trichlorethylene is 98%.

Embodiment 2

[0025] 1.5 kg FeCl 3 ·6H 2 O, 0.8 kg AlCl 3 ·6H 2 O and 0.5 kg TiCl 4 Add 12 kg of water, stir and dissolve to obtain a solution with a metal salt concentration of 0.82 mol / L, add 10 kg of activated carbon, soak at room temperature for 10 hours, filter, dry at 110°C for 10 hours, and roast at 450°C for 8 hours to obtain a metal salt 14% (mass content) of the acetylene hydrochlorination catalyst. Mix acetylene and tetrachloroethane gas and feed it into a fixed-bed catalyst reactor under the conditions of 220°C and 0.1MPa. The molar ratio of acetylene and tetrachloroethane gas is 1:1.05, and the space velocity of the reaction gas is 500 h -1 , The conversion rate of acetylene is 85%, the selectivity of vinyl chloride is 96%, and the selectivity of trichlorethylene is 99%.

Embodiment 3

[0027] 1.5 kg FeCl 3 ·6H 2 O, 0.8 kg AlCl 3 ·6H 2 O, 0.8 kg CaCl 2 2H 2 O, 0.5 kg SnCl 2 2H 2 O and 0.3 kg TiCl 4 Add 10 kg of water, stir and dissolve to obtain a solution with a metal salt concentration of 1.8 mol / L, add 10 kg of activated carbon, soak at room temperature for 10 hours, filter, dry at 110°C for 10 hours, and roast at 400°C for 8 hours to obtain a metal salt 21% (mass content) of the acetylene hydrochlorination catalyst. Mix acetylene and tetrachloroethane gas, 250 0 C. Under the condition of 0.5MPa, pass it into a fixed-bed catalyst reactor for reaction, the molar ratio of acetylene and tetrachloroethane gas mixture is 1:1.02, and the reaction gas space velocity is 100 h -1 , The conversion rate of acetylene is 81%, the selectivity of vinyl chloride is 97%, and the selectivity of trichlorethylene is 98%.

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PUM

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Abstract

The invention provides a method for preparing chloroethylene by reaction of chloroform and acetylene, and a catalyst used in the method. In the method, the acetylene and the chloroform are taken as raw materials, and the chloroethylene and a byproduct-tetrachloroethylene are further generated in the presence of the non-toxic, harmless and green catalyst. The catalyst takes two or more of FeCl3, AlCl3, CuCl2, CuCl and TiCl4 as active components and takes activated carbon as a carrier, and the non-toxic and harmless load type acetylene hydrochlorination catalyst can be prepared by adopting an impregnation method. The acetylene hydrochlorination process comprises the steps of mixing the acetylene and the chloroform to obtain a mixture, then filling the mixture into a fixed bed reactor filled with the activated carbon catalyst, enabling the acetylene to be hydrochlorinated in the presence of the catalyst to generate the chloroethylene, and carrying out dehydrochlorination on the chloroform to generate the tetrachloroethylene. After the method is used for preparing the chloroethylene, a mercury catalyst or a barium catalyst used for preparing the chloroethylene by acetylene hydrochlorination at present can be avoided, so that the non-polluting production of the chloroethylene can be realized in deed.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for green catalytic production of vinyl chloride by using acetylene as a carbon source and chloroform as a chlorine source. Background technique [0002] Vinyl chloride is a basic chemical raw material, and its polymer (PVC) is one of the five general-purpose synthetic resins, which has a very wide range of applications. With the increasing demand of vinyl chloride, it is of great significance to develop the technology of vinyl chloride production. At present, the global PVC output has exceeded 50 million t / a, and the production capacity of PVC in China alone has exceeded 20 million t / a. Due to resource reasons, the operating rate of the ethylene process in my country is obviously insufficient, and its production capacity is only about 25% of the total production capacity, and nearly 75% of the production capacity comes from the calcium carbide acetylene pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/128B01J27/135B01J27/138C07C21/06C07C21/12C07C17/02
Inventor 菅盘铭钟娟娟蔡璐孙辉张倩
Owner YANGZHOU UNIV
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