Recovery of fluorinated emulsifying acids from basic anion...

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

C - Chemistry, Metallurgy

07

C

260/534

C07C 53/21 (2006.01) B01J 47/00 (2006.01) B01J 49/00 (2006.01) C07C 51/47 (2006.01)

Patent

CA 1135283

HOE 79/F 902 RECOVERY OF FLUORINATED EMULSIFYING ACIDS FROM BASIC ANION EXCHANGERS Abstract of the disclosure: 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 pre- ferably 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 especial- ly suitable for the recovery of fluorinated emulsifiers in the coagulation or concentration of fluoropolymerlatices.

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