Patent ID: 9669382
Date: 2017-06-06
CPC Classifications: B01D,B01J,C10G,Y02C

Claim:
1. A method of isomerizing hydrocarbons, the method comprising the steps of: isomerizing a hydrocarbon stream in a reactor to produce an intermediate isomerized stream; fractionating the intermediate isomerized stream to produce an off gas stream and a heavy isomerized stream, wherein the off gas stream comprises an off gas recycle stream; drying the off gas recycle stream in an off gas dryer to produce a hydrogen recycle stream, wherein the off gas dryer comprises an off gas dryer membrane separating the off gas recycle stream from an off gas purge stream, wherein the off gas dryer membrane comprises a copolymer of tetrafluoroethvlene and perfluoro-3,6-dioxa-4-methyl-7-octene-sulfonic acid, and wherein a molar ratio of tetrafluoroethylene to perfluoro-3,6-dioxa-4-methyl-7-octene-sulfonic acid in the copolymer is from about 6/1 to about 8/1; and feeding the hydrogen recycle stream into the reactor.