Dependence of diffusive permeation rates and selectivities on upstream and downstream pressures : IV. Computer simulation of nonideal systems

In previous papers we have shown that a semi-empirical thermodynamic—diffusive model appears to duplicate the behavior of the hexane/heptane/polyethylene system with regard to the effect of upstream and downstream pressure on rate and separation. In the present paper we present a numerical method fo...

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Bibliographic Details
Published in:Journal of membrane science 1984, Vol.19 (1), p.39-49
Main Authors: Shelden, R.A., Thompson, E.V.
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
computer applications
diffusion
Exact sciences and technology
filtration
filtration systems
General and physical chemistry
Membranes
Porous materials
pressure
simulation
thermodynamics
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Summary:In previous papers we have shown that a semi-empirical thermodynamic—diffusive model appears to duplicate the behavior of the hexane/heptane/polyethylene system with regard to the effect of upstream and downstream pressure on rate and separation. In the present paper we present a numerical method for dealing with our model equations, which allows us to treat nonideal systems, and to make use of more general expressions describing the concentration dependence of diffusivity. This method is discussed in detail, and several typical simulation results are presented.
ISSN:0376-7388
1873-3123
DOI:10.1016/S0376-7388(00)80169-6