Activity coefficients and diffusion coefficients of dilute aqueous solutions of lithium, sodium, and potassium hydroxides

Noulty, Robert A.; Leaist, Derek G.

doi:10.1007/bf00647692

Cited by 29 publications

(15 citation statements)

References 36 publications

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“…The empirical ion-interaction coefficients B = 1.0 1 and B, = 0.08 dm2 mol-' were determined from binary activity coefficients for each electrolyte (14,24). Experimental values of L,, coefficients derived from the diffusion data are given in Table 5.…”

Section: Naso + Hzomentioning

confidence: 99%

Moments analysis of restricted ternary diffusion: sodium sulfite + sodium hydroxide + water

Leaist¹

1985

Can. J. Chem.

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Ternary diffusion coefficients can be determined from restricted-diffusion experiments by evaluating zeroth and first time moments of the difference in a concentration-dependent property measured at two levels along the diffusion column. The method is used to determine ternary diffusion coefficients for aqueous sodium sulfite + sodium hydroxide solutions from conductance measurements. It is shown that these data can be analyzed to obtain the ternary diffusivity of sulfur dioxide in strongly alkaline solutions where sulfite is the major transporting species for the sulfur dioxide component. At high pH values, coupled flow of hydroxide ions leads to a significant increase in the diffusivity of the sulfur dioxide component relative to its diffusivity in pure water. Binary diffusion coefficients for aqueous sodium sulfite solutions are also reported.

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Section: Naso + Hzomentioning

confidence: 99%

Moments analysis of restricted ternary diffusion: sodium sulfite + sodium hydroxide + water

Leaist¹

1985

Can. J. Chem.

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“…Stock solutions of NaOH were prepared by dilution of filtered saturated solutions [4]. Reagent grade glycine and HCI were used without further purification.…”

Section: Methodsmentioning

confidence: 99%

“…The activity coefficient term in Eq. (34) can be estimated by differentiation of the semi-empirical expression [4] lny, = -SfI'/2(1 + (40)…”

Section: Theorymentioning

confidence: 99%

Bidirectional Coupled Diffusion of Glycine Driven by p^H Gradients

Leaist¹

1987

Ber Bunsenges Phys Chem

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Stokes magnetically‐stirred diaphragm cells have been used to determine multicomponent diffusion coefficients for aqueous glycine + hydrochloric acid + sodium hydroxide solutions at 25°C. In acidic solutions, pH gradients drive coupled flows of glycine toward the low‐pH region of the solution, countercurrent to the flow of H+ ions. In alkaline solutions, the coupled flow of glycine travels in the opposite direction, “up” the pH gradient. The diffusion measurements also show that gradients in concentration of glycine can produce large coupled flows of H+ and OH− ions. Equations are developed to predict multicomponent transport coefficients for glycine and related ampholytes in acid‐base solutions.

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“…It was assumed, for the base case, that the order of magnitude of the effective diffusion coefficients was l0 -I~, which has been verified for a number of alcohols in water (Blasifiski and Amanowitz, 1979). The parameter DeB was always assumed to be twice greater than DeA, which is approximately verified for the diffusion coefficients of NaOH and Na2CO 3 in aqueous solutions (Leaist and Noulty, 1985;Noulty and Leaist, 1984). Supposing that a simple relationship such as …”

Section: Numerical Solutionmentioning

confidence: 99%

A mathematical model for non-catalytic liquid-solid reversible reactions

Pais¹,

Portugal²

1998

Computers & Chemical Engineering

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A sharp interface model has been developed for non-catalytic liquid-solid reversible reactions. It is shown that a sharp reaction interface can occur, in certain circumstances, even if the reaction is reversible. Because the pseudosteady state approximation may not be valid for liquid-solid reactions, this assumption was not made in the model. This led to the need for numerical resolution and the model was solved using orthogonal collocation both in the unreacted core and in the ash layer. Owing to the equilibrium relationship, which holds at the reaction interface, the concentrations of the liquid species are coupled at this location, resulting in a possibly non-linear set of algebraic equations that must be solved in order to evaluate concentrations at the boundaries. An analysis is made of the influence of the parameters that characterize the model. The effect of reversibility is a decrease in the driving force for diffusion. © 1998 Elsevier Science Ltd. All rights reserved

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Activity coefficients and diffusion coefficients of dilute aqueous solutions of lithium, sodium, and potassium hydroxides

Cited by 29 publications

References 36 publications

Moments analysis of restricted ternary diffusion: sodium sulfite + sodium hydroxide + water

Moments analysis of restricted ternary diffusion: sodium sulfite + sodium hydroxide + water

Bidirectional Coupled Diffusion of Glycine Driven by p^H Gradients

A mathematical model for non-catalytic liquid-solid reversible reactions

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Activity coefficients and diffusion coefficients of dilute aqueous solutions of lithium, sodium, and potassium hydroxides

Cited by 29 publications

References 36 publications

Moments analysis of restricted ternary diffusion: sodium sulfite + sodium hydroxide + water

Moments analysis of restricted ternary diffusion: sodium sulfite + sodium hydroxide + water

Bidirectional Coupled Diffusion of Glycine Driven by pH Gradients

A mathematical model for non-catalytic liquid-solid reversible reactions

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Product

Resources

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Bidirectional Coupled Diffusion of Glycine Driven by p^H Gradients