A method to apply Zavitsas' aqueous electrolyte model to multicomponent solutions and its equivalence to Zdanovskii's rule

Reynolds, Jacob G.

doi:10.1002/aic.17487

Title: A method to apply Zavitsas' aqueous electrolyte model to multicomponent solutions and its equivalence to Zdanovskii's rule

Journal Article · 12 November 2021 · AIChE Journal

DOI: https://doi.org/10.1002/aic.17487 · OSTI ID:1830041

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Washington River Protection Solutions, LLC Richland Washington USA

Abstract Zavitsas developed an aqueous electrolyte thermodynamic model and applied it to single electrolyte solutions previously. Here, a method to apply the model to multicomponent solutions is derived by setting the water activity to the mole fraction of free water in the mixture. The method is shown to work effectively for the CsBr‐KNO ₃ ‐H ₂ O and CsCl‐KNO ₃ ‐H ₂ O systems at 100.3°C even at concentrations greater than 6 molal. The largest error in the prediction of water activities was just −0.00365 for the CsBr‐KNO ₃ ‐H ₂ O system and −0.00631 for the CsCl‐KNO ₃ ‐H ₂ O system. Zavitsas' model naturally obeys Zdanovskii's rule because when two electrolyte solutions with the same fraction of free water are mixed together, water is obviously going to have that same fraction in the mixture. This means that Zavitsas' model will likely work well for the many electrolytes that obey Zdanovskii's rule.

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Sponsoring Organization:: USDOE

OSTI ID:: 1830041

Journal Information:: AIChE Journal, Journal Name: AIChE Journal Journal Issue: 2 Vol. 68; ISSN 0001-1541

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: United States

Language:: English

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