A manufacturing method for 1,1,1,3,3-pentafluoropropane

C - Chemistry – Metallurgy – 07 – C

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C07C 19/08 (2006.01) C07C 17/00 (2006.01) C07C 17/21 (2006.01) C07C 17/25 (2006.01)

Patent

CA 2241131

The claimed manufacturing method for 1,1,1,3,3- pentafluoropropane comprises the first process, in which 1,1,1-trifluoro-3-chloro-2-propene is obtained by inducing a reaction between 1,1,1,3,3-pentafluoropropane and hydrogen fluoride in the vapor phase, and the second process,in which the 1,1,1,3,3-pentafluoropropane is obtained by inducing a reaction between 1,1,1-trifluoro-3- chloro-2-propene and hydrogen in the vapor phase, and 1,1,1- trifluoro-3-chloro-2-propene obtained in the first process is supplied to the second process after removing the HCl by-products. This invention can provide a new economic manufacturing method of 1,1,1,3,3-pentafluoropropane with high yield and selectivity.

Cette invention concerne un processus de production de 1,1,1,3,3-pentafluoropropane, lequel consiste, lors d'une première étape, à faire réagir en phase gazeuse du 1,1,1,3,3-pentachloropropane avec du fluorure d'hydrogène de manière à obtenir du 1,1,1-trifluoro-3-chloro-2-propène. La seconde étape consiste à faire réagir en phase gazeuse le 1,1,1-trifluoro-3-chloro-2-propène susmentionné avec du fluorure d'hydrogène de manière à obtenir du 1,1,1,3,3-pentafluoropropane. Le 1,1,1-trifluoro-3-chloro-2-propène obtenu lors de la première étape est traité dans la seconde étape après élimination du produit dérivé qui s'est formé et qui consiste en du chlorure d'hydrogène. Ce processus nouveau et économique permet de produire du 1,1,1,3,3-pentafluoropropane en grandes quantités ou avec une bonne sélectivité.

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