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SimpleModel for Characterizing a Donnan DialysisProcess.

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Title: SimpleModel for Characterizing a Donnan DialysisProcess.
Authors: Hasson, David1, Beck, Adam1, Fingerman, Fiana1, Tachman, Chen1, Shemer, Hilla1, Semiat, Raphael1
Source: Industrial & Engineering Chemistry Research. Apr2014, Vol. 53 Issue 14, p6094-6102. 9p.
Subjects: Donnan equilibrium, Dialysis (Chemistry), Chemical processes, Pressure, Solution (Chemistry), Diffusion
Abstract: The objective of this work is tocharacterize the kinetics of Donnandialysis process by a simple model. The Nernst–Planck equationis simplified by neglecting the membrane swelling pressure and assumingan average diffusion coefficient for all ions. Experimental data arepresented on the permeation of monovalent phosphate ions from a KH2PO4/NaH2PO4feed solutionto a NaCl receiver solution using two different anion exchange membranes:a low flux membrane (Fumasep FAB) and a high flux membrane (SelemionAMV). Measurements indicate a brief initial ion exchange process inwhich the membrane is loaded with phosphate ions. Phosphate transportdata fit the predicted correlations and provide values of the overallkinetic coefficient. The kinetic coefficients derived from both membraneswere found to increase linearly with the membrane phosphate concentration.The phosphate dialysis data of the low flux membrane were found tobe controlled by a diffusive process, while the data of the high fluxmembrane were found to be mass transfer controlled. The increase ofthe kinetic coefficient with phosphate concentration is shown to berelated to the increase in membrane ion diffusivity with its solutionconcentration. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The objective of this work is tocharacterize the kinetics of Donnandialysis process by a simple model. The Nernst–Planck equationis simplified by neglecting the membrane swelling pressure and assumingan average diffusion coefficient for all ions. Experimental data arepresented on the permeation of monovalent phosphate ions from a KH2PO4/NaH2PO4feed solutionto a NaCl receiver solution using two different anion exchange membranes:a low flux membrane (Fumasep FAB) and a high flux membrane (SelemionAMV). Measurements indicate a brief initial ion exchange process inwhich the membrane is loaded with phosphate ions. Phosphate transportdata fit the predicted correlations and provide values of the overallkinetic coefficient. The kinetic coefficients derived from both membraneswere found to increase linearly with the membrane phosphate concentration.The phosphate dialysis data of the low flux membrane were found tobe controlled by a diffusive process, while the data of the high fluxmembrane were found to be mass transfer controlled. The increase ofthe kinetic coefficient with phosphate concentration is shown to berelated to the increase in membrane ion diffusivity with its solutionconcentration. [ABSTRACT FROM AUTHOR]
ISSN:08885885
DOI:10.1021/ie404291q