Processes for purification and production of fluorocarbons
AssigneePCBU Services, Inc.
InventorsStephan M. Brandstater, Mitchel Cohn, Victoria E. Hedrick, Yuichi Iikubo
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Abstract
The present invention involves processes that utilize an olefinic compound, in particular, hexafluoropropene (HFP) or chlorotrifluoroethene (CFC-1113) as extracting agents in the purification of pentafluoroethane (HFC-125). These processes can utilize recovered HFP as a precursor for the production of heptafluoropropane (HFC-227) or other derivatives.
Claims30
A process for recovering pentafluoroethane (HFC-125) comprising the steps of:
- (a) providing a first mixture comprising pentafluoroethane (HFC-125) and chloropentafluoroethane (CFC-115);
- and
- (b) distilling said first mixture in the presence of hexafluoropropene (HFP) to separate pentafluoroethane (HFC-125) from a second mixture comprising hexafluoropropene (HFP) and chloropentafluoroethane (CFC-115).
A process for recovering pentafluoroethane (HFC-125) comprising the steps of:
- (o) providing a first mixture comprising pentafluoroethane (HFC-125) and chloropentafluoroethane (CFC-115);
- (p) distilling said first mixture in the presence of chlorotrifluoroethene (CFC-1113) to separate pentafluoroethane (HFC 125) from an eighth mixture comprising chlorotrifluoroethene (CFC-1113) and chloropentafluoroethane (CFC-115);
- (q) recovering said pentafluoroethane (HFC-125) as an overhead product;
- and
- (r) recovering said eighth mixture as a bottom product.
A process for producing halogenated hydrocarbons comprising the steps of:
- (u) providing a mixture comprising a near-azeotrope having at least one halogenated hydrocarbon and at least one halocarbon;
- (v) distilling said near-azeotropic mixture in the presence of an olefinic extracting agent to separate said at least one halogenated hydrocarbon from a remaining mixture comprising said olefinic extracting agent and said at least one halocarbon;
- and
- (w) converting said olefinic extracting agent in said remaining mixture to a derivative compound.
Dependencies are inferred from the claim text.