Process for perfluorocycloalkane purification

Details Process for perfluorocycloalkane purification Process for perfluorocycloalkane purification

1999-10-29

2000-11-14

Siegel, Alan

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

C07C 1738

Patent

active

061472670

ABSTRACT:
A process is disclosed for recovering at least one perfluorocycloalkane selected from the group consisting of octafluorocyclobutane, hexafluoro-bis(trifluoromethyl)cyclobutane (1,2 and 1,3; cis and trans), and heptafluoro(trifluoromethyl)cyclobutane from a mixture comprising (a) the perfluorocycloalkane, (b) olefinic impurity and, optionally, (c) saturated chlorine-containing impurity selected from the group consisting of chlorocarbons, hydrochlorocarbons, hydrochlorofluorocarbons, chlorofluorocarbons and mixtures thereof. The process involves (1) contacting the mixture with hydrogen in the presence of a hydrogenation catalyst under conditions suitable for converting at least a portion of the olefinic impurity to a saturated impurity containing at least one fluorine substituent less than the olefin impurity and reducing the chlorine content of at least a portion of the saturated chlorine-containing impurity (if present), and (2) separating said at least one perfluorocycloalkane from the products produced during the hydrogenation of (1).

REFERENCES:
patent: 5001287 (1991-03-01), Fernandez et al.
patent: 5105035 (1992-04-01), Wang et al.
patent: 5569797 (1996-10-01), Fu et al.
patent: 5780695 (1998-07-01), Kalnes
patent: 5858595 (1999-01-01), Merkel et al.

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