Patent ID: 6723153
Filing Date: 2004-04-20
Classification: B01D,C01B,H01B,Y02P

Abstract:
A process for separating a mixture of SF6 and N2, the SF6/N2 mixture being obtained from a gas insulated line, comprising introducing the mixture to a mobile membrane separator comprising at least one separating membrane which preferentially passes N2, collecting an SF6 enriched retentate, and forming an N2 enriched permeate, wherein said mixture has an initial SF6 content of from 5 to 50 volume-%, said at least one membrane comprises a polymer matrix composed of a polycarbonate made from a bisphenol in which at least 25% of the bisphenol units in the polymer chain are tetrahalogenated with chlorine or bromine, and said mixture is fed to said membrane separator at a membrane feed pressure of 10 to 13 bar.