FACILITATED TRANSPORT MECHANISM IN FIXED SITE CARRIER MEMBRANES

被引:55
作者
NOBLE, RD
机构
[1] University of Colorado, Department of Chemical Engineering, Boulder, CO 80309
关键词
DIFFUSION; FACILITATED TRANSPORT; GAS AND VAPOR PERMEATION; GAS SEPARATIONS; THEORY; FIXED SITE CARRIER MEMBRANES;
D O I
10.1016/S0376-7388(00)81541-0
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Facilitated transport of gases, such as O2, has been observed for fixed site carrier membranes. Carrier-impregnated ion-exchange membranes have also been used to produce facilitated transport of CO2, H2S and olefins when the carriers are not completely mobile. The actual mechanism for this facilitated transport has not been determined previously. The facilitated transport is provided by the exchange of solute between the free solute region and the bound complexing agent combined with gradients in the free solute and complexed carrier. The ratio of mobility for exchange between the regions is the dimensionless equilibrium constant of the reversible reaction. An expression is also derived for the relationship between the effective diffusion coefficient of the complex in facilitated transport, D(AB), and the diffusion coefficients for exchange between free and complexed solute, D(DH) and D(HD). Since D(AB) can be determined from experimental results, D(DH) and D(HD) can be calculated. The results also show the morphology dependence of D(AB). The diffusion coefficient of the free solute D(A) also changes with the loading of the complexing agent in the film. This morphology dependence can explain why the gas permeability can decrease when the concentration of the complexing agent increases in the membrane.
引用
收藏
页码:297 / 306
页数:10
相关论文
共 19 条
[1]   DIFFUSIVITIES IN GLASSY-POLYMERS FOR THE DUAL MODE SORPTION MODEL [J].
BARRER, RM .
JOURNAL OF MEMBRANE SCIENCE, 1984, 18 (MAR) :25-35
[2]  
CHERN RT, 1983, ACS SYM SER, V223, P47
[3]   OXYGEN NITROGEN TRANSPORT IN GLASSY-POLYMERS WITH OXYGEN-BINDING PENDENT GROUPS [J].
DELANEY, MS ;
REDDY, D ;
WESSLING, RA .
JOURNAL OF MEMBRANE SCIENCE, 1990, 49 (01) :15-36
[4]   DUAL-MODE TRANSPORT OF PENETRANTS IN GLASSY-POLYMERS [J].
FREDRICKSON, GH ;
HELFAND, E .
MACROMOLECULES, 1985, 18 (11) :2201-2207
[5]   CO2 SORPTION IN POLY(ETHYLENE-TEREPHTHALATE) ABOVE AND BELOW GLASS-TRANSITION [J].
KOROS, WJ ;
PAUL, DR .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1978, 16 (11) :1947-1963
[6]   STYRENE ETHYLBENZENE SEPARATION USING FACILITATED TRANSPORT THROUGH PERFLUOROSULFONATE IONOMER MEMBRANES [J].
KOVAL, CA ;
SPONTARELLI, T ;
NOBLE, RD .
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 1989, 28 (07) :1020-1024
[7]   CONDENSED PHASE FACILITATED TRANSPORT OF OLEFINS THROUGH AN ION-EXCHANGE MEMBRANE [J].
KOVAL, CA ;
SPONTARELLI, T .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1988, 110 (01) :293-295
[8]   FACILITATED TRANSPORT IN ION-EXCHANGE MEMBRANES [J].
LEBLANC, OH ;
WARD, WJ ;
MATSON, SL ;
KIMURA, SG .
JOURNAL OF MEMBRANE SCIENCE, 1980, 6 (03) :339-343
[9]   OXYGEN BINDING AND TRANSPORT IN THE MEMBRANE OF POLY[[TETRAKIS(METHACRYLAMIDOPHENYL)PORPHINATO]COBALT-CO-HEXYL METHACRYLATE] [J].
NISHIDE, H ;
OHYANAGI, M ;
OKADA, O ;
TSUCHIDA, E .
MACROMOLECULES, 1988, 21 (10) :2910-2913
[10]   REVERSIBLE COORDINATION AND FACILITATED TRANSPORT OF MOLECULAR NITROGEN IN POLY((VINYLCYCLOPENTADIENYL)MANGANESE) MEMBRANE [J].
NISHIDE, H ;
KAWAKAMI, H ;
KURIMURA, Y ;
TSUCHIDA, E .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1989, 111 (18) :7175-7179