Chlorination process

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 19/08 (2006.01) C07C 17/10 (2006.01)

Patent

CA 2166218

There is provided a process for the preparation of 1,1,1- trichlorotrifluoroethane in which 1,1-dichloro-2,2,2-trifluoroethane is subjected to chlorination by bringing the 1,1-dichloro-2,2,2-trifluoroethane into contact with chlorine within a reaction vessel characterised in that the process is conducted in the liquid phasein the presence of a chemical free radical initiator under a pressure of from 1 to 20 bar and at a temperature within the range 50 to 120 °C, and the product is separated from the reaction mixture by fractional distillation. The product is useful in the manufacture of insecticides.

L'invention concerne un procédé de préparation de 1,1,1-trichlorotrifluoroéthane dans lequel on soumet à une chloration le 1,1-dichloro-2,2,2-trifluoroéthane par mise en contact du 1,1-dichloro-2,2,2-trifluoroéthane avec du chlore à l'intérieur d'une cuve de réaction. L'invention est caractérisée par le fait que le procédé est mis en application en phase liquide en présence d'un initiateur chimique à radicaux libres sous une pression de 1 à 20 bars et à une température située dans une plage de 50 à 120 DEG C, et que le produit est séparé du mélange réactionnel par distillation fractionnelle. Le produit est efficace dans la production d'insecticides.

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