Artigo Revisado por pares

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

ISSN

1520-5045

Autores

Shiguang Li, John L. Falconer, Richard D. Noble, Rajamani Krishna,

Tópico(s)

Membrane Separation and Gas Transport

Resumo

The 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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