Modeling Permeation of CO 2 /CH 4 , CO 2 /N 2 , and N 2 /CH 4 Mixtures Across SAPO-34 Membrane with the Maxwell−Stefan Equations
2006; American Chemical Society; Volume: 46; Issue: 12 Linguagem: Inglês
10.1021/ie0610703
ISSN1520-5045
AutoresShiguang Li, John L. Falconer, Richard D. Noble, Rajamani Krishna,
Tópico(s)Membrane Separation and Gas Transport
ResumoThe objective of this paper is test the capability of the Maxwell−Stefan (M−S) diffusion formulation to predict binary mixture permeation fluxes across a SAPO-34 membrane using only data on pure-component adsorption isotherms and diffusivities. Experiments were carried out for permeation of CO2/CH4, CO2/N2, and N2/CH4 mixtures across a SAPO-34 membrane with upstream pressures ranging to 7.2 MPa, ensuring that high occupancies within the zeolite layer are reached. Good agreement between the M−S mixture model and experiments are obtained provided the binary exchange coefficients Đ12 in the M−S equations are assumed to have high enough values to ensure that intercage hops of the species occur independently of one other.
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