Facilitated transport of carbon dioxide and hydrogen sulfide in ion exchange membranes

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1986

OSTI ID:6823080

Way, J D

Steady-state fluxes of acid gases and mixtures with CH/sub 4/ were measured for ion exchange membranes (IEMs) containing and ethylene diamine (EDA) carrier. The IEMs were prepared by exchanging EDA/sup +/ in aqueous solution for counterions in 170 ..mu..m Nafion perfluorosulfonic acid ionomer films. Facilitation factors (F) of 26.7 to 1.44 were measured for CO/sub 2/ feed gases with 1% to 100% CO/sub 2/, respectively. The H/sub 2/S F value was 15.8 for a 5% feed gas, increasing to 24.1 at a 1% feed. Facilitation factors measured for both CO/sub 2/ and H/sub 2/S in IEMs were larger than those for immobilized liquid membranes containing 1 M EDA solution. Separation factors for acid gases over CH/sub 4/ of up to 552 and 1200 were observed for CO/sub 2/ and H/sub 2/S, respectively, during binary mixture experiments. In experiments with CO/sub 2//H/sub 2/S/CH/sub 4/ feed mixtures, separation factors ranged from 503 to 1170. The IEM separation factors compare very well with those for commercial cellulose ester membranes which range from 21-30. In competitive transport experiments, CO/sub 2/ was preferred over H/sub 2/S for all feed composition studied because the equilibrium constant (K/sub eg/) for the CO/sub 2//EDA reaction was 326 times that for the H/sub 2/S/EDA reaction. The CO/sub 2//H/sub 2/S flux ratios ranged from 2.85 to 103. The implication of these data is that an EDA IEM could separate and fractionate a CO/sub 2//H/sub 2/S mixture. The same competitive effect was observed during CO/sub 2//H/sub 2/S experiments. Analytical models based on constant carrier concentration predicted CO/sub 2/ and H/sub 2/S facilitation factors very well.

• Research Organization: Colorado Univ., Boulder (USA)
• DOE Contract Number: AI21-84MC21271
• OSTI ID: 6823080
• Country of Publication: United States
• Language: English

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