Influence of resin selectivity on film diffusion‐controlled ion exchange

Copeland, J. P.; Henderson, Clifford L.; Marchello, J. M.

doi:10.1002/aic.690130312

Cited by 10 publications

(2 citation statements)

References 7 publications

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“…There exists a large number of studies of the liquid-side mass transfer in a binary ion exchange system. The mathematical descriptions for such a system have been presented by many investigators (Copeland et al, 1967;Copeland and Marchellow, 1969;Glasski and Dranoff, 1963;Kataoka et al, 1968Kataoka et al, , 1971Kataoka et al, , 1973Schlogle and Helfferich, 1957;Smith and Dranoff, 1964;Turner and Snowdon, 1968a, b). Schlogle and Helfferich (1957) first applied the Nernst-Planck (N-P) equation to the fluxes of ionic species and showed that the electric field caused by the difference in the diffusivities affects the ion exchange rate significantly.…”

Section: Introductionmentioning

confidence: 99%

Liquid‐side ion exchange mass transfer in a ternary system

1987

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Liquid phase mass transfer in a ternary system [ R -A ] + ( B + €) has been analyzed according to the Nernst-Planck equation. The equilibrium isotherm was represented by the mass action law. In the case of D,, > DB > DE, the resin phase concentration of B ion with time showed a peak. The height of the peak was influenced by the diffusivity ratio, equilibrium constant, and ionic valence. When the modified equilibrium constant K' 2 100 in the case of A ion and K' 2 500 in the case of Band €ions, the exchange rates of the ions could be obtained by approximat-Experimental data on the change of the resin phase concentration y with time are represented. In a [ R -H ' ] + (Na' + Zn") system, the change of yNa with time showed a high peak. In a [ R -H+] + (Na+ + Li') system, the change of yLi with time showed a small peak. No peaks arose in a [ R -Na+] + (H' + Li') system. The data agreed reasonably well with the values calculated according to the theoretical equations.

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Section: Introductionmentioning

confidence: 99%

Liquid‐side ion exchange mass transfer in a ternary system

1987

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“…They inspected the variables that influence the breakthrough of mixed-bed, and developed an empirical relationship between leakage and capacity. Kunin (1960) 5 Many researchers have performed numerous studies focused on liquid-side mass transfer in binary ion exchange systems; Copeland et al (1967) further conducted an experimental study on the kinetics of mixed-bed deionization. He examined the effects of influent concentration, flow rate, bed depth, and temperature on bed performance and concluded that the ion exchange rate was controlled by a liquid-film mass transfer mechanism at low concentrations.…”

Section: Mbie-sim Backgroundmentioning

confidence: 99%

Optimizing Cation to Anion Resin Ratio in Mixed-Bed Ion Exchange

Rahman¹,

Yoon²,

Foutch³

2014

J.I.E.

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A mixed bed ion exchange (MBIE) column producing ultrapure water will be removed from service well before its capacity is exhausted. There is usually an operational criterion for replacing or regenerating the bed; for example, defining 50 parts per trillion (ppt) Na as an endpoint in Pressurized Water Reactors (PWRs). These plant-specific criteria depend on the water treatment objectives and include low day-today concentrations or the ability to handle an upset event such as a concentration spike. In mixing the bed initially the cation to anion resin ratio is frequently set to where the equivalence of cation capacity equals the equivalence of anion capacity. An alternative approach is to define the resin ratio based on the feedwater pH so that the initial breakthrough time of cations and anions are the same. This ratio calculation procedure using feedwater analysis and a rate limited ion exchange model is described and the impact of this approach is discussed.

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Kinetic parameters of isotopic exchange reaction in finite bath

Huang

Tsai

1977

Can J Chem Eng

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A mathematical model has been proposed for an isotopic exchange reaction between the solid particles and ions in a solution of finite volume. A theoretical equation has been derived to predict the exchange fraction as a function of the dimensionless time T with the kinetic parameters t, t1 and final fractional uptake U as parameters for the exchange rate controlled by combined film diffusion, surface chemical reaction and intraparticle diffusion. The exchange fraction increases as

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Influence of resin selectivity on film diffusion‐controlled ion exchange

Cited by 10 publications

References 7 publications

Liquid‐side ion exchange mass transfer in a ternary system

Liquid‐side ion exchange mass transfer in a ternary system

Optimizing Cation to Anion Resin Ratio in Mixed-Bed Ion Exchange

Kinetic parameters of isotopic exchange reaction in finite bath

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