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A kind of preparation method of hexachloro-1,3-butadiene

A technology of butadiene and trichloroethylene, which is applied in the preparation of halogenated hydrocarbons, chemical instruments and methods, organic chemistry, etc., can solve the problems of reduced flammability, no direct preparation, etc., and achieves easy operation, high atom utilization, The effect of low energy consumption

Active Publication Date: 2020-01-07
YANGZHOU UNIV
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Problems solved by technology

[0002] Hexachloro-1,3-butadiene, referred to as HCBD, currently has no industrialized method for directly preparing hexachloro-1,3-butadiene, and there are few reports on domestic and foreign literature and patents, mainly as carbon tetrachloride and tetrachloride Formation of by-products in the chlorination of butane derivatives in the production of vinyl chloride
In general, increasing the number of chlorine substituents on a compound increases its toxicity but decreases its flammability

Method used

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  • A kind of preparation method of hexachloro-1,3-butadiene

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preparation example Construction

[0017] A preparation method of hexachloro-1,3-butadiene, the reaction equation is as follows:

[0018]

Embodiment 1

[0020] Trichlorethylene: tetrachlorethylene weighed 20.8g trichlorethylene and 79g tetrachlorethylene in a hydrothermal kettle with a molar ratio of 1:3, and added 20g of anhydrous aluminum trichloride with a mass fraction of 20%. After reacting at 80°C for 8 hours, the conversion rate of trichlorethylene was 63%, and the selectivity of hexachloro-1,3-butadiene was 32%.

Embodiment 2

[0022] Trichlorethylene: tetrachlorethylene weighed 13.8g trichlorethylene and 87g tetrachlorethylene in a hydrothermal kettle with a molar ratio of 1:5, and added 5.04g of anhydrous aluminum trichloride with a mass fraction of 5%. The reaction was carried out at 120°C for 4 hours, the conversion rate of trichlorethylene was 72%, and the selectivity of hexachloro-1,3-butadiene was 27%.

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Abstract

The invention provides a preparation method of hexachloro-1,3-butadiene. The preparation method has the characteristics as follows: trichlorethylene and tetrachlorethylene are used as raw materials, anhydrous metal chloride is used as a catalyst, the metal chloride can be one or more of ferric chloride, aluminum chloride and zinc chloride, a reactant is one or two of trichlorethylene and tetrachlorethylene, the molar ratio of the trichloroethylene to the tetrachlorethylene is 0:100 to 100:0, and the mass fraction of the catalyst is 1-20%. Under the condition that the reaction temperature is 50-250 DEGC, the conversion rate of the reactant is 20-80%, and the selectivity of the hexachloro-1,3-butadiene is 20-60%. The preparation method is simple in process, simple and convenient in operation, low in energy consumption and high in atom utilization rate.

Description

technical field [0001] The invention relates to a preparation method of hexachloro-1,3-butadiene, which uses trichlorethylene and tetrachloroethylene as raw materials to prepare hexachloro-1,3-butadiene, and belongs to the field of chemical industry. Background technique [0002] Hexachloro-1,3-butadiene, referred to as HCBD, currently has no industrialized method for directly preparing hexachloro-1,3-butadiene, and there are few reports on domestic and foreign literature and patents, mainly as carbon tetrachloride and tetrachloride By-products of chlorolysis of butane derivatives during the production of vinyl chloride. Through the large-scale production of these two products, hexachloro-1,3-butadiene can be obtained to meet industrial needs, or hexachlorobutadiene can also be synthesized directly through the chlorination of butane or butadiene. The product of the chlorination reaction depends largely on the temperature and pressure at which the reaction takes place, so by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C21/21C07C17/269
CPCC07C17/269C07C21/21
Inventor 菅盘铭张伟邓永航袁金郑茂芬于楠
Owner YANGZHOU UNIV
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