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Title: Characterization of hollow fiber membranes in a permeator using binary gas mixtures
Authors: Wang, R.
Liu, S.L.
Lin, T.T.
Chung, T.S. 
Keywords: Concentration polarization
Hollow fiber membranes
Membrane permeator
Mixed gas permeation
Non-ideal gas behaviors
Simulation model
Issue Date: 14-Mar-2002
Citation: Wang, R.,Liu, S.L.,Lin, T.T.,Chung, T.S. (2002-03-14). Characterization of hollow fiber membranes in a permeator using binary gas mixtures. Chemical Engineering Science 57 (6) : 967-976. ScholarBank@NUS Repository.
Abstract: We have studied the CO2/CH4 mixed gas permeation through hollow fiber membranes in a permeator. An approach to characterize the true separation performance of hollow fiber membranes for binary gas mixtures was provided based on experiments and simulations. Experiments were carried out to measure the retentate and permeate flow rates and compositions at each outlet. The influences of pressure drop within the hollow fibers, non-ideal gas behavior in the mixture and concentration polarization were taken into consideration in the mathematics model. The calculation results indicate that the net influence of the non-ideal gas behavior, competitive sorption and plasticization yields the calculated CO2 permeance in a mixed gas permeator close to that obtained in pure gas tests. Whereas the CH4 permeance is higher in the mixed gas tests than that in the pure gas tests, as the plasticization caused by CO2 dominates the permeation process. As a result, the CO2/CH4 mixed gas selectivity is smaller than those obtained in pure gas tests at equivalent pressures. The calculated membrane performance shows little changes with stage cut if the effect of concentration polarization is accounted for in the calculation. The integration method developed in this study could provide more accurate characterizations of mixed gas permeance of hollow membranes than other estimation methods, as our model considers the roles of non-ideal gas behavior and concentration polarization properly. © 2002 Elsevier Science Ltd. All rights reserved.
Source Title: Chemical Engineering Science
ISSN: 00092509
DOI: 10.1016/S0009-2509(01)00435-3
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