Processes for the separation of potassium salts of perfluoroalka

Details Processes for the separation of potassium salts of perfluoroalka Processes for the separation of potassium salts of perfluoroalka

1975-12-18

1977-09-20

Douglas, Winston A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2604128, 260419, 2604285, 260539R, C09F 700, C11C 300

Patent

active

040496813

ABSTRACT:
Processes for the separation of a potassium salt of a perfluoroalkanoic acid having at least 1 and at most 12 carbon atoms per molecule or a mixture of potassium salts of a homologous mixture of the said perfluoroalkanoic acids from an aqueous solution that also contains a substantial proportion of one or more watersoluble salts of inorganic acids which process comprises extracting at room temperature the said aqueous solution with an organic solvent which is at least partially miscible with water and in which potassium salts of the said perfluoroalkanoic acids are soluble, the said organic solvent being selected from the group consisting of alkanols having at least 3 and at most 5 carbon atoms per molecule, ketones having at least 3 and at most 7 carbon atoms per molecule, N,N-dimethylformamide and dimethyl sulfoxide, and subsequently recovering the potassium salt of the perfluoroalkanoic acid or mixture of potassium salts of the homologous mixture of perfluoroalkanoic acids.

REFERENCES:
patent: 2802028 (1957-08-01), England
patent: 2831004 (1958-04-01), Barnhart et al.
patent: 2863889 (1958-12-01), Marks
patent: 2948741 (1960-08-01), Barnhart et al.
patent: 3542859 (1970-11-01), Litt
patent: 3816524 (1974-06-01), Grinstead
patent: 3882153 (1975-05-01), Seki et al.

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