Patent ID: 9370733
Filing Date: 2016-06-21
CPC Classification: B01D,C08G

Claim Text:
1. A batch chromatography process for the purification of (per)fluoropolyethers (PFPE) carboxylates, the process comprising: a) contacting a mixture (M) of non-functional PFPEs and functional PFPEs carboxylates wherein Mn of the (per)fluoropolyoxylakylene chain in the PFPE carboxylate is equal to or higher than 1,500, said mixture (M) having functionality (F), with a solid phase and a fluorinated organic solvent at ambient conditions to obtain a suspension (S) of a solid phase having adsorbed onto it a mixture (M1) of functional PFPE carboxylates with functionality (F1) higher than (F) and a liquid phase having therein dissolved a mixture (M2) with functionality (F2) lower than (F); b) separating the liquid phase from the solid phase; c) optionally carrying out one or more washings of the solid phase with the same fluorinated solvent as used in step a); d) adding the solid phase with a mixture of an alcohol and a fluorinated organic solvent to obtain a suspension (S2) of the solid phase in a liquid phase, said liquid phase having mixture (M1) therein dissolved; e) separating the liquid phase from the stationary phase.