Concentration of aqueous hydrogen peroxide solution by pervaporation

► We have concentrated an aqueous solution of hydrogen peroxide by pervaporation. ► The peroxide solution concentration was varied between 4 and around 40 wt%. ► The membranes employed were two copolymers of polytetrafluoroethylene. ► The highest water-peroxide selectivity achieved was 12 at 43 wt% peroxide level. ► The membranes kept in 35 wt% peroxide solution for 165 days were stable.