Patent ID: 6143938
Filing Date: 2000-11-07
Classification: C07C

Abstract:
A process for recovering at least one perhalocycloalkane selected from the group consisting of octafluorocyclobutane, hexafluorobis(trifluoromethyl)-cyclobutane ( 1,2 and 1,3; cis and trans), 1,2-dichloro-1,2,3,3,4,4-hexafluorocyclobutane (cis and trans), 1,1,2,2-tetrachloro-3,3,4,4-tetrafluorocyclobutane, 1-chloro-1,2,2,3,3,4-hexafluoro-4-(trifluoromethyl)cyclobutane, heptafluoro-(trifluoromethyl)cyclobutane and chloroheptafluorocyclobutane from a mixture comprising (a) said at least one perhalocycloalkane and (b) olefinic impurity, comprising:(1) contacting the mixture with chlorine under conditions suitable for chlorinating the olefinic impurity, thereby converting the olefinic impurity to a saturated impurity containing at least one chlorine substituent; and(2) separating said at least one perhalofluorocycloalkane from the saturated chlorine-containing impurity produced from the olefinic impurity in (1).