Patent ID: 6147267
Filing Date: 2000-11-14
Classification: C07C

Abstract:
A process for recovering at least one perfluorocycloalkane selected from the group consisting of octafluorocyclobutane, 1,2-hexafluorobis(trifluoromethyl)cyclobutane, 1,3-hexafluorobis(trifluoromethyl)cyclobutane, and heptafluoro(trifluoromethyl)cyclobutane from a mixture comprising (a) said at least one perfluorocycloalkane and (b) olefinic impurity containing fluorine, comprising:(1) contacting the mixture with hydrogen in the presence of a hydrogenation catalyst selected from the group consisting of platinum and iridium, under conditions suitable for converting at least a portion of the olefinic impurity to a saturated impurity containing at least one less fluorine substituent than the olefin impurity; and(2) separating said at least one perfluorocycloalkane from the saturated impurity produced from the olefinic impurity in (1).