Process for the recovery of perfluorinated sulphonic acids...

Details Process for the recovery of perfluorinated sulphonic acids... Process for the recovery of perfluorinated sulphonic acids...

2005-05-10

2005-05-10

Griffin, Walter D. (Department: 1764)

Chemistry of hydrocarbon compounds

Saturated compound synthesis

By condensation of a paraffin molecule with an olefin-acting...

C585S719000, C585S721000, C502S026000, C502S027000

Reexamination Certificate

active

06891076

ABSTRACT:
Process for the recovery of perfluorinated sulphonic acid from a hydrocarbon residue, comprising the steps of(a) treating the residue with an alkyl ammonium salt of the perfluorinated sulphonic acid or a mixture of an alkyl ammonium salt of the perfluorinated sulphonic acid and the perfluorinated sulphonic acid in an amount being effective to liquefy the residue at ambient temperature;(b) contacting the liquefied residue with water at conditions to obtaining an aqueous extract containing the perfluorinated sulphonic acid and/or the alkyl ammonium salt of the perfluorinated acid into water; and(c) separating water from the aqueous extract to recover the perfluorinated sulphonic acid or the mixture of the acid and the ammonium salt.

REFERENCES:
patent: 5603812 (1997-02-01), Hommeltoft
patent: 5618769 (1997-04-01), Hommeltoft
patent: 5759357 (1998-06-01), Hommeltoft
patent: 1 044 963 (2000-10-01), None
patent: 1 065 199 (2001-01-01), None

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