Recovery of fluorinated emulsifying acids from basic anion excha

Details Recovery of fluorinated emulsifying acids from basic anion excha Recovery of fluorinated emulsifying acids from basic anion excha

1980-01-28

1981-08-04

Niebling, John F.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2604285, 260513F, 562605, C07C 5142, C08F 188

Patent

active

042821622

ABSTRACT:
To elute fluorinated emulsifying acids, especially perfluoro-carboxylic acids, from basic anion exchangers a mixture of dilute mineral acid and polar organic solvents is used. The solvent should be miscible with water preferably to an extent of at least 40%. By this process the required amount of eluent and the time of elution can be reduced while simultaneously the amount of recovered emulsifying acid can be improved. The process is especially suitable for the recovery of fluorinated emulsifiers in the coagulation or concentration of fluoropolymer latices.

REFERENCES:
patent: 2863889 (1958-12-01), Marks
patent: 3882153 (1975-05-01), Seki et al.
patent: 4005137 (1977-01-01), Ruldolph et al.

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