Produits Chimiques Ugine Kuhlmann

Pcuk Products Chimiques Ugine Kuhlmann

Francois Fine

Louis Foulletier

Elie Ghenassia

Gerard Krempf

Yvan Verot

William Jequier

Michel Abel

This invention relates to a continuous gaseous-phase process for the preparation of trichlorotrifluoroethane, dichlorotetrafluoroethane and monochloropentafluoroethane, in predetermined proportions, from tetrachloroethylene, chlorine and hydrofluoric acid in the presence of a catalyst. The process is characterized by the combination of two chlorination-fluorination reactors in sequence, a parallel fluorination-dismutation reactor, and a separation unit for extracting the desired products and recycling recovered hydrofluoric acid and non-fluorinated or insufficiently fluorinated products. The process advantageously yields dichlorotetrafluoroethane containing less than 7% asymmetric isomer, and trichlorotrifluoroethane containing less than 2% asymmetric isomer.

Continuous process for the gaseous-phase preparation of

This invention relates to the method for making ethylene oxide, characterized by the fact that ethylene oxide in the gaseous state is made to react with anhydrous gaseous hydrochloric acid, with the reaction medium likewise being maintained in the gaseous state during the reaction.

Method for making ethylene chlorohydrin

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Saint Laurent de Mure, France

Francois Fine