Js. Yang et Gh. Hsiue, SELECTIVE OLEFIN PERMEATION THROUGH AG(I) CONTAINED SILICONE RUBBER-GRAFT-POLY(ACRYLIC ACID) MEMBRANES, Journal of membrane science, 126(1), 1997, pp. 139-149
The silicone rubber (SR) based graft copolymer, SR-graft-poly(acrylic
acid) (SR-g-AA), was modified by incorporating silver ion (SR-g-AA-Ag) for C-4 olefin/paraffin gases separation. Olefin could be transporte
d across the complex membrane by the silver ion facilitated transport.
The permeation properties, as measured by gas chromatography equipped
with a gas permeability analyzer, implied a facilitating effect for o
lefin. Typical trans-2-butene/n-butane selectivity in the 95.6% grafte
d complex membrane at 25 degrees C is 4.0. Also, the influences of AA%
grafting, measuring temperature and pressure to the permeation proper
ties of C-4 gases were studied. In addition, the sorption behaviors of
C-4 gases in SR based membranes are presented and discussed by the Fl
ory-Huggins equation. Finally, the selectivity of solubility and diffu
sivity in these SR based membranes are also discussed.