Application of new sulfonated ionomer membranes in the separation of pentene and pentane by facilitated transport

Development of new ionomer blend membranes, their characterization, and their application in the perstractive separation of alkenes from alkene-alkane mixtures. II. Electrical and facilitated transport properties

“…Pentene fluxes through the membranes were four times higher than those through commercial perfluorosulfonated ionomer (PSI) membranes 12 and 38 times higher than those through previously reported PSU membranes. 10 Separation factors were 13 times higher than with the PSI membranes and 5 times higher than with the initial PSU membranes. Pentene flux through PSUSi(CH 3 ) 3 /PSU-SO 3 H blended membranes was 55 times higher than through the first sulfonated PSU membranes, while separation factors increased 30-fold.…”

“…[7][8][9] We previously reported the facilitated transport of olefins through newly developed sulfonated polysulfone (PSU) Udel membranes. 10 Good selectivity for olefin/paraffin separation was obtained, but low fluxes of the olefin through the membrane were observed. New membranes have been developed in an attempt to increase the fluxes through membranes by increasing the ion exchange capacity, increasing the polymer free volume, and reducing membrane thickness.…”

“…The pentene flux of 2.65 ϫ 10 Ϫ8 mol cm Ϫ2 s Ϫ1 for a sulfonated/aminated PSU blended membrane with an ion-exchange capacity of nearly 3 meq/g is one of the highest obtained for PSU membranes. 10 In Figure 5, the fluxes through blends of PSU/ PSU-SO 3 H and separation factors for pentenepentane mixtures are shown as a function of the ion-exchange capacities of the membranes. Fluxes of pentene showed a dependence on the silver content in the membranes.…”

Development of new ionomer blend membranes, their characterization, and their application in the perstractive separation of alkenes from alkene-alkane mixtures. I. Polymer modification, ionomer blend membrane preparation, and characterization

“…1 In this study, olefin fluxes were increased using three concepts. The free volume of polymers is increased by introducing bulky groups unto the polymer backbone to decrease the packing density and the torsional mobility of the chains, 2,3 and high gas permeabilities result.…”

Zwitterionic Silver Complexes as Carriers for Facilitated‐Transport Composite Membranes

“…[12][13][14][15][16] Among ionic liquids reported, we are particularly interested in zwitterionic-type ionic liquids that contain covalently bound anionic sulfonate group, which can be used as a fixed sites to bind silver ions, such as in sulfonated ionomer membranes. [3] Herein, we report on the synthesis and characterization of zwitterionic-type silver complexes, and their performance as carriers for facilitated transport membranes in separating isoprene from a mixture with n-pentane. Isoprene/n-pentane was chosen as the feed mixture because isoprene is traditionally separated from C5 raffinate by using an energy-intensive extractive distillation owing to azeotrope formation with npentane.…”