Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
637318 | Journal of Membrane Science | 2009 | 27 Pages |
Abstract
In this work, the solvent evaporation method for the estimation of the Fickian diffusion coefficients in binary and in multi-component solvent(s)-polymer systems is reviewed. The existing frameworks for multi-component diffusion are also examined in detail. The described methodology is applied to estimate the diffusion coefficients in the binary systems acetone/cellulose acetate (CA), solvent/poly(vinyl acetate) and in the ternary system water/acetone/cellulose acetate, which is widely used in asymmetric membrane manufacture. The solvent evaporation process from these systems is studied as a one-dimensional numerical experiment. For this purpose, the evaporation process is modeled as a coupled heat and mass transfer problem with a moving boundary. The Galerkin finite element method (GFEM) is used to simultaneously solve the non-linear governing equations. The model predictions are compared with experimental data for polymer solution weight vs. time during evaporation to estimate the unknown parameters of the Vrentas-Duda equation. The estimated diffusion coefficients were found to be in good agreement with those measured by other methods. It is believed that this review might contribute to a more rational design of industrial processes.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
George D. Verros,