화학공학소재연구정보센터
Chemical Engineering Science, Vol.64, No.2, 265-275, 2009
Hollow fiber membrane contactor transient experiments for the characterization of gas/liquid thermodynamics and mass transfer properties
We present results from experiments and numerical Simulations of contact between a non-reactive gas (N2O and CO2) and a physical solvent (H2O) Occurring ill a polypropylene (PP) hollow fiber membrane contactor. The closed-loop liquid flow within the experimental setup provides transient curves representing the progressive saturation of the solvent by the gas. We develop an in-house numerical model to fully characterize the gas/liquid mass transfer both in the non-wetted and in the wetted modes, i.e., when the liquid starts partially wetting the pores of the membrane. Using experiments and numerical simulations, we show that the Henry constant (H) and the molecular diffusion coefficient (D-L(A)) of a non-reactive gas absorbing into a liquid solvent can be extracted by parameter estimation. Both parameters are obtained within a single experiment at a constant temperature and the comparison with temperature-dependant correlations yields excellent agreement over the whole range of temperature studied in this work. simulations show a partial wetting of the membrane pore by the liquid meniscus during a contact between CO2 and H2O, possibly due to the plasticizer effect Of CO2 inside the membrane contactor fibers. (C) 2008 Elsevier Ltd. All rights reserved.