Process for preparing 1, 1, 1-trifluoroethane and 1, 1, 1-difluoro chloroethane

A technology for chlorodifluoroethane and trifluoroethane, which is applied in the field of preparing halogenated hydrocarbons, can solve the problems of decreased catalyst activity, increased production cost, decreased reaction yield and the like, and achieves the effect of inhibiting the generation of tar-like substances
CN1634816AInactive Publication Date: 2005-07-06苏州联氟化学有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
苏州联氟化学有限公司
Publication Date
2005-07-06
Estimated Expiration
Not applicable · inactive patent
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Abstract

The present invention discloses a method for preparing 1,1,1-trifluoroethane and 1,1,1-difluorochloroethane. In the existence of liquid phase fluorinated catalyst and additive, VDC and hydrogen fluoride are reacted in liquid phase. The liquid phase fluorinated catalyst is selected from halide of metal antimony, tin, titanium, tantalum, niobium or fluorosulfuric acid or chlorosultonic acid. The additive comprises at least one kind of phenolic compound, and can be added with organic phosphorus compound. The inventive method can effectively reduce tarry matters generation, thereby prolonging useful life of the catalyst and improving its efficiency.
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Description

technical field

[0001] The invention relates to a method for preparing halogenated hydrocarbons, in particular to a method for preparing 1.1.1-trifluoroethane and 1.1.1-chlorodifluoroethane through a liquid-phase fluorination method. Background technique

[0002] 1.1.1-Trifluoroethane (i.e. R143a) and 1.1.1-chlorodifluoroethane (i.e. R142b) are widely used compounds, which can be used as refrigerants, foaming agents, propellants, cleaning agents, etc. , can be used as an environmentally compatible substitute for Freon because it has not been found to have adverse effects on the ozone layer.

[0003] Using vinylidene chloride and hydrogen fluoride in the presence of catalysts such as tin tetrachloride to prepare R143a and R142b by liquid phase fluorination is a technology that has already been disclosed. The commonly used catalysts include metal antimony, metal tin, metal titanium, metal Halides such as niobium, and fluorosulfonic acid, chlorosulfo...

Claims

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