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US 5,087,329 AGranted
Process for separating pentafluoroethane from a mixture of halogenated hydrocarbons containing chloropentafluoroethane
AssigneeE. I. Du Pont de Nemours and Company
InventorVinci M. Felix
Life of this patent
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Abstract
Separating pentafluoroethane from a mixture of pentafluoroethane and chloropentafluoroethane by adding a fluorocarbon extractive agent having 1-4 carbon atoms, and optionally containing hydrogen and/or chlorine, in an extractive distillation zone to recover pentafluoroethane substantially free of chloropentafluoroethane in the overhead product stream.
Claims9
A process for separating pentafluoroethane from a first mixture of pentafluoroethane and chloropentafluoroethane which comprises:
- adding a fluorocarbon extractive agent having 1-4 carbon atoms optionally containing hydrogen and/or chlorine, and having a boiling point greater than -39.degree. C., and less than about 50.degree. C., to the first mixture in order to form a resultant second mixture;
- separating pentafluoroethane from chloropentafluoroethane of the second mixture by extractively distilling the second mixture in an extractive distillation zone and thereby recovering, as overhead product, a pentafluoroethane stream substantially free of chloropentafluoroethane.
Dependencies are inferred from the claim text.