Ion Exchange Membrane Purification of Organic Electrolytes

Lightfoot, E. N.; Friedman, Irwin

doi:10.1021/ie50536a024

Cited by 12 publications

(3 citation statements)

References 4 publications

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“…5a). The same reason underlies the unbalance in the change in the concentration of hydrocarbonate ions and carbonic acid formed in reaction (2) in the acid chamber (Fig. 5b) and the concentration of hydrocarbonates in the alkaline (curve 1, Fig.…”

Section: Mathematical Model Of Sodium Chloride and Bicarbonatementioning

confidence: 75%

“…When this approach is used in chemical, food, and other industries and for processing real solutions in water preparation, elec trodialysis is complicated by the chemical reactions of weak electrolytes (that are present in these solutions) with the water dissociation products. The transport of weak electrolytes through ion exchange membranes during electrodialysis was first studied by Lightfoot and Friedman [2]. They discovered that when pH of a solution containing carboxylic acid salts was reduced, the flow of carboxylate anions decreased because of their transformation to carboxylic acids.…”

Section: Introductionmentioning

confidence: 99%

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Study of pH correction process of chloride-bicarbonate dilute solutions by electrodialysis with bipolar membranes

et al. 2012

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The pH of a dilute chloride-hydrocarbonate solution and the concentrations of chloride ions and carbonic acid anions at the outlet of the alkaline and acid chambers of the electrodialysis cell formed by bipo lar and anion exchange membranes were determined. The decrease in the concentration of hydrocarbonate ions in the alkaline chamber with growth of current density was not equal to its increase in the acid chamber. This disbalance was caused by two concurrent processes: the electromigration ion transport through the anion exchange membrane and the chemical reactions of hydrocarbonate ions with the water dissociation products formed on the bipolar and anion exchange membranes. A mathematical model was suggested to describe the electrodialysis correction of the pH of a dilute chloride-hydrocarbonate solution. The experi mental data on the correction of pH of the chloride-hydrocarbonate solution were well approximated by both the model that takes into account water dissociation on the anion exchange membrane and the simpli fied model that neglects water dissociation. The experimental data agreed well with the results of calculations by the model in which the effective anion transport numbers were calculated only from ion concentrations and diffusion coefficients in solution. This reflects the outer diffusion character of the kinetics of ion transport through the anion exchange membrane, with pH of dilute solutions corrected by electrodialysis.

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Section: Mathematical Model Of Sodium Chloride and Bicarbonatementioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Study of pH correction process of chloride-bicarbonate dilute solutions by electrodialysis with bipolar membranes

et al. 2012

View full text Add to dashboard Cite

show abstract

“…In general, these factors operate to favour the separation of inorganic from organic materials. However, electrodiffusion of ions through the membrane can increase the simultaneous diffusion of non-electrolytes (Lightfoot & Friedman, 1954), a factor tending to reduce the efficiency of desalting.…”

Section: Discussionmentioning

confidence: 99%