Method for preparing monofluo-rodicloroethane

Abstract

The invention discloses a preparation method of monofluo-rodicloroethane, which comprises 1, processing addition reaction on acetylene and hydrogen chloride or hydrogen fluoride at the mol ratio of 1.5-2.5:1, in the presence of catalyst, to prepare vinyl chloride or fluoride, 2, processing addition reaction on the vinyl chloride or fluoride at the mol ratio of 1:3-5 or on the fluoride or vinyl chloride at the mol ratio of 1:3-5, in the presence of catalyst to prepare monofluo-chloroethane, 3, reacting the monofluo-chloroethane and chlorine at the mol ratio of 4-6:1, in the catalysis of catalyst or ultraviolet light to generate monofluo-rodicloroethane. The invention can avoid using vinylidene chloride and 1, 1, 1-methyl chloroform as basic materials, thereby reducing material cost of the whole process and improving the purity of monofluo-rodicloroethane (HCFC 141b).

Description

technical field The invention relates to a preparation method of a compound, in particular to a preparation method of fluorodichloroethane (HCFC141b). Background technique Fluorodichloroethane (HCFC141b) is a fluorine compound widely used in the field of foaming, and it is the main substitute to completely replace monofluorotrichloromethane (CFC11). At present, the domestic annual output is about 100,000 tons, and the main production route uses vinylidene chloride or 1,1,1-trichloroethane as the main raw material. Due to the constant price of vinylidene chloride and 1,1,1-trichloroethane Maintained at a relatively high level, resulting in high manufacturing costs of 1-fluorodichloroethane, and there must be trace amounts of vinylidene chloride in the process of producing 1-fluorodichloroethane with vinylidene chloride as raw material, which seriously affects the production of 1-fluorodichloroethane. The quality of ethane, so the process must add a cumbersome vinylidene chlo...

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