Premium
Development of a space‐charge transport model for ion‐exchange membranes
Author(s) -
GuzmánGarcia Angel G.,
Pintauro Peter N.,
Verbrugge Mark W.,
Hill Robert F.
Publication year - 1990
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690360713
Subject(s) - counterion , chemistry , membrane , aqueous solution , electrokinetic phenomena , partition coefficient , diffusion , nafion , ion exchange , alkali metal , solvent , ionic bonding , inorganic chemistry , analytical chemistry (journal) , thermodynamics , ion , chromatography , organic chemistry , electrochemistry , electrode , biochemistry , physics
A two‐dimensional, electrokinetic transport model that incorporates ionic hydration, orientation of solvent molecules by an applied electric field, and solvent dipole‐dipole interactions is developed. The model is used to simulate equilibrium and transport experiments for perfluorosulfonic acid membranes containing aqueous alkali metal sulfate solutions. The membrane is modeled as an array of cylindrical pores. Solution of the mathematical model requires that the membrane porosity, water partition coefficient, coion partition coefficient, water diffusion coefficients, and coion and counterion diffusion coefficients be known. Membrane coion and counterion diffusion coefficients were determined from free solution equivalent conductance data. All other parameters were determined experimentally for a Nafion (of E. I. du Pont de Nemours Inc.) cation‐exchange membrane and five 0.1 M alkali metal sulfate solutions. Experimental radiotracer data for coion absorption as well as for coion and water transport are compared with theoretical predictions to test the accuracy of the model.