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.
