Transport of carbon dioxide in nation membranes enhanced by relative humidity and ethylenediamine content

Conference · Fri Jan 01 00:00:00 EST 1988

OSTI ID:5585487

Dunkley-Timmerman, T M; Rochelle, G T ^[1]

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1. The Univ. of Texas at Austin (US)

An approach to the recovery/removal of carbon dioxide (CO/sub 2/) from gas streams has been to use ion-exchange membranes as supports for complexation agents because of their extremely high permeabilities and selectivities. Such preparations have the advantage that the carrier cannot easily be forced out of the membrane since it is held there by electrostatic forces. The authors have investigated the cation-exchange membrane Nafion 117 which was equilibrated in aqueous concentrations of ethylenediamine (EDA). The flux of CO/sub 2/ is selectively enhanced by its reversible reaction with EDA, CO/sub 2/ permeability (rho/sub CO/2/sub /) and apparent diffusion coefficient (D/sub app,CO/2/sub /) were measured in a counter-current horizontal flow cell with N/sub 2/ sweep gas at 25{sup 0}C, 0% to 100% relative humidity (RH), 0.005 to 1 atm CO/sub 2/ feed gas concentration and membrane EDA loadings (C/sub m/) from 0 (H+ cations) to 1.46 gmol EDA/gmol exchange sites. Permeabilities up to 29,200 barriers were measured in the EDA loaded membranes up to 37 times greater than those which were achieved in the H+ form.

• OSTI ID: 5585487
• Report Number(s): CONF-880348-
• Resource Relation: Conference: American Institute of Chemical Engineers spring national meeting, New Orleans, LA (USA), 6-10 Mar 1988; Other Information: Technical Paper 83A
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
CARBON DIOXIDE
RECOVERY
ION EXCHANGE MATERIALS
NATURAL GAS
SEPARATION PROCESSES
CHEMICAL COMPOSITION
ION EXCHANGE
MEMBRANES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
MATERIALS
OXIDES
OXYGEN COMPOUNDS
030300* - Natural Gas- Drilling
Production
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