The Rate of Swelling of Ion-Exchange Resin Particles in Different Salt Solutions.

Pulido, Carlos; Fontell, Krister; Danielsson, Ingvar; Theorell, Hugo; Thorell, B.

doi:10.3891/acta.chem.scand.10-0049

Cited by 5 publications

(2 citation statements)

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“…Since in all other exchange processes here the value of q tends more to unity than in the above case, it can be neglected. The diffusion coefficients resulting from our experiments are summarized in Table 1 3.2 X 10- 6 3.05 X 10- 6 2.2 X 10- 6 1.8 X 10-6 0.98 X 10- 6 2.1 X 10- 6 2.1X1O- 6 1.8 X 10- 6 1.6 X 10-6 0.98 X 10-6…”

Section: Resultsmentioning

confidence: 99%

“…In the case of a simple ion exchange process with k = 1, 2 representing the two exchanging ions, k = 3 the fixed ion and k=4 the water, we derive from eq. (5), (2), and (3) and the Gibbs-Duheme equation (6) the relation (7) For the fluxes we make the statement J l = -L ll Xl -L14 X 4 with (8) Xl = grad J.l.l -el/e2 grad J.l.2 X 4 =nl/n4 grad J.l.l -ndn4 grad J.l.2 (9) where the Onsager relation L« = L k i was used. In this case we need three coefficients L 11 , L 14 , and L 44 for the description of the diffusion process.…”

Section: The Equation Of Transportmentioning

confidence: 99%

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The diffusion process in swelling ion exchanger beads

Dickel¹,

Richter²

1967

J. polym. sci., C Polym. symp.

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Diffusion coefficients were evaluated from kinetic measurements on an ion exchanger by means of an equation of diffusion for swelling ion exchanger beads. It follows that the true diffusion coefficient changes with the ionic composition in such a way that it is smallest for the almost pure H form (DH) and greatest for the pure K form (DK). For the total change HR + K → KR + H of the pure H form to the K form the diffusion coefficient therefore must run from DH to DK. It is shown that one can describe the entire diffusion process with the constant DK value with the exception of a negligible induction period. On the other hand, one can describe the entire backward exchange process with the constant DH value. Therefore, the fact already found—that one can describe the exchange processes with constant but different diffusion coefficient for forward and backward reaction—is theoretically founded.

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