Process for separating from one another the non-functional, monofunctional and bifunctional species contained in perfluoropolyoxyalkylenes

摘要

A process for separating, or enriching, in non-functional, monofunctional and bifunctional species the perfluoropolyoxyalkylenes of formula (I): Z-O-Rf-Y where Rf = a perfluoropolyoxyalkylene chain comprising one or more monomeric units of formula CFXO (X = F, CF<7>), and optionally also units (-CF<6>CF<6>O-); Z, Y, like or different from each other, are non-functional groups or functional groups -OH, with at least Z or Y in part of such perfluoropolyoxyalkylenes being or containing an -OH group, which consists in subjecting said perfluoropolyoxyalkylenes to column chromatography using, as eluents, non-polar fluorinated solvents, either alone or in admixture with polar solvents.