Non-supported catalyst and preparation method of chlorotrifluoroethylene or trifluoroethylene

Abstract

The invention provides a non-supported catalyst and a preparation method of chlorotrifluoroethylene or trifluoroethylene, the non-supported catalyst comprises a sulfur-containing bulk phase MoP, and an auxiliary agent which is a combination of more than one of copper chloride, palladium chloride and chloroplatinic acid, in the sulfur-containing bulk phase MoP, MoP is a molybdenum phosphide covalent compound which is formed by combining metal molybdenum and non-metal phosphorus and has a crystal structure, and the molar ratio of molybdenum to phosphorus is 0.3-3, in the sulfur-containing bulk phase MoP, the molar ratio of molybdenum to sulfur is 0.5-2.7, and the molar ratio of metal to molybdenum in the auxiliary agent is 0.01-0.7. According to the method, 1, 1, 2-trifluoro-2, 2, 1-trichloroethane is used as a raw material, the non-supported catalyst is used as a catalyst, and gas-phase selective hydrodechlorination is performed to prepare chlorotrifluoroethylene or trifluoroethylene. The catalyst provided by the invention is a non-supported catalyst, and is environment-friendly and high in low-temperature activity. The catalyst disclosed by the invention is low in raw material cost, environment-friendly and good in high-temperature sintering resistance.

Description

technical field [0001] The invention belongs to the field of compound preparation, and relates to the preparation of chlorotrifluoroethylene and trifluoroethylene, in particular to a non-loaded catalyst and a preparation method of chlorotrifluoroethylene or trifluoroethylene. Background technique [0002] Chlorotrifluoroethylene and trifluoroethylene are important fluorine-containing polymer monomers, which can be used to prepare a series of fluorine coatings, fluorine resins, fluorine rubber and fluorine-chlorine lubricants. At the same time, chlorotrifluoroethylene is also an important fluorine-containing intermediate, which can be used to prepare downstream products such as trifluoroethylene, bromotrifluoroethylene, hexafluorobutadiene, trifluorostyrene, and fluorinated bromine oil. [0003] The traditional synthesis of chlorotrifluoroethylene adopts the reduction process of 1,1,2-trifluoro-2,2,1-trichloroethane (CFC-113) zinc powder method. This process is batch producti...

AI Technical Summary

Problems solved by technology

The catalysts for hydrodechlorination disclosed in Chinese patents CN1065261.A and CN1351903 all use noble metals as the main catalyst, and add other metals as auxiliary agents at the same time, because noble metal catalysts are expensive, which leads to increased production costs

[0005] At present, the catalysts used for catalytic hydrodechlorination of CFC-113 to prepare chlorotrifluoroethylene and trifluoroethylene are expensive or the conversion rate of raw materials is not high.

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