Method of perfluorinating perchloro compounds

  • Inventors:
  • Assignees: Rhone Progil
  • Publication Date: January 22, 1975
  • Publication Number: GB-1381145-A

Abstract

1381145 Perfluorination RHONE-PROGIL SA 5 May 1972 [6 May 1971] 21194/72 Heading C2 A method of perfluoririat a perchloro compound containing a perchloromethyl or perchloroethyl group, in the vapour phase, by reaction with anhydrous hydrofluoric acid, is carried out continuously in three successive zones maintained at temperatures of 200‹ to 250‹ C., 250‹ to 275‹ C. and 275‹ to 350‹ C., respectively, with the proviso that the temperature difference between one zone and the next is - at least 10‹ C., each zone containing a fixed bed fluorination catalyst, the absolute pressure in each zone being from 1 to 4 bars, the replacement of the first two atoms of chlorine per molecule of the perchloro compound being carried out in the first zone, the fluorination being continued in the second zone to an extent such that the ratio of the number of fluorine atoms to the number of chlorine atoms in the intermediate perchloro fluoro compound(s) issuing from the second zone is at least 1À5, and the fluorination being completed in the third zone. The residence time in each zone is preferably from 2 to 10 seconds, and the HF is preferably used in excess. Examples describe the perfluorination of hexachloroacetone, trichloroacetyl chloride, octachlorobutanone and trichloroacetaldehyde.

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