Production of chloro-2,2,2-trifluoroethane

Details Production of chloro-2,2,2-trifluoroethane Production of chloro-2,2,2-trifluoroethane

C - Chemistry, Metallurgy

07

C

C07C 19/12 (2006.01) C07C 17/21 (2006.01) C07C 17/383 (2006.01)

Patent

CA 2238508

A process for producing chloro-2,2,2-trifluoroethane as a co-product of the production of 1,1,1,2-tetrafluoroethane by hydrofluorination of trichloroethylene which comprises (i) treating the 1,1,1,2-tetrafluoroethane product stream containing chloro-2,2,2-trifluoroethane and hydrogen fluoride to form a mixture of 1,1,1,2-tetrafluoroethane and chloro-2,2,2- trifluoroethane and (ii) distilling said mixture to separate essentially pure chloro-2,2,2-trifluoroethane from the mixture. A preferred distillation in step (ii) comprises (iia) distilling the mixture to separate essentially pure 1,1,1,2-tetrafluoroethane and form a second mixture of 1,1,1,2- tetrafluoroethane and chloro-2,2,2-trifluoroethane and (iib) distilling said second mixture to separate essentially pure chloro-2,2,2-trifluoroethane from the second mixture.

L'invention porte sur un procédé de production de chloro-2,2,2-trifluoroéthane comme coproduit de la production de 1,1,1,2-tétrafluoroéthane par hydrofluoruration de trichloroéthylène consistant à: (i) traiter un flux de 1,1,1,2-tétrafluoroéthane contenant du chloro-2,2,2-trifluoroéthane et du fluorure d'hydrogène de manière à former un mélange de 1,1,1,2-tétrafluoroéthane et de chloro-2,2,2-trifluoroéthane; (ii) distiller ledit mélange pour en extraire du chloro-2,2,2-trifluoroéthane pratiquement pur. Le type de distillation préféré de l'étape (ii) consiste à: (iia) distiller le mélange pour en extraire le 1,1,1,2-tétrafluoroéthane pratiquement pur et former un deuxième mélange de 1,1,1,2-tétrafluoroéthane et de chloro-2,2,2-trifluoroéthane; et (iib) distiller ce deuxième mélange pour en extraire du chloro-2,2,2-trifluoroéthane pratiquement pur.

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