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

US5246588A · kind A · utility

Assignee

• Ausimont S.p.A. · IT

Inventors

• Claudio Tonelli · Vimercate, IT
• Stefano Turri · Milano, IT
• Marinella Levi · Milano, IT
• Giuseppe Gianotti · Novara, IT

Key dates

• Filing date: Oct 20, 1992
• Grant date: Sep 21, 1993
• Expiry date: Oct 20, 2012

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D15/426
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A process for separating, or enriching, non-functional, monofunctional and bifunctional species in a mixture of perfluoropolyoxyalkylenes of the general formula: EQU Z--O--Rf--Y where PA0 Rf=a perfluoropolyoxyalkylene chain comprising one or more monomeric units of formula ##STR1## --CFXO-- (X=F, CF.sub.3), and optionally also units (--CF.sub.2 CF.sub.2 O--); and PA0 Z, Y, like or different from each other, are non-functional groups or functional groups containing --OH, which consists in subjecting said mixture of perfluoropolyoxyalkylenes to column chromatography using, as eluents, non-polar fluorinated solvents, either alone or in admixture with polar solvents.