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Thermodynamic evaluation and optimization of the (NaCl + Na2SO4+Na2CO3+KCl+K2SO4+K2CO3) system
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry. Åbo Akademi Process Chemistry Centre, Åbo Akademi University, Biskopsgatan 8, FI-20500 Turku, Finland.
2007 (English)In: Journal of Chemical Thermodynamics, ISSN 0021-9614, E-ISSN 1096-3626, Vol. 39, no 7, 1001-1021 p.Article in journal (Refereed) PublishedText
Abstract [en]

A complete, critical evaluation of all phase diagrams and thermodynamic data was performed for all condensed phases of the (NaCl + Na2SO4 + Na2CO3 + KCl + K2SO4 + K2CO3) system, and optimized parameters for the thermodynamic solution models were obtained. The Modified Quasichemical Model in the Quadruplet Approximation was used for modelling the liquid phase. The model evaluates first- and second-nearest-neighbour short-range order, where the cations (Na+ and K+) were assumed to mix on a cationic sublattice, while anions (CO32-, SO42-, and Cl-) were assumed to mix on an anionic sublattice. The thermodynamic properties of the solid solutions of (Na,K)(2)(SO4,CO3) were modelled using the Compound Energy Formalism, and (Na,K)CI was modelled using a substitutional model in previous studies. Phase transitions in the common-cation ternary systems (NaCl + Na2SO4 + Na2CO3) and (KCl + K2SO4 + K2CO3) were studied experimentally using d.s.c./t.g.a. The experimental results were used as input for evaluating the phase equilibrium in the common-cation ternary systems. The models can be used to predict the thermodynamic properties and phase equilibria in multicomponent heterogeneous systems. The experimental data from the literature are reproduced within experimental error limits.

Place, publisher, year, edition, pages
London: Academic Press, 2007. Vol. 39, no 7, 1001-1021 p.
Keyword [en]
alkali salts, Modified Quasichemical Model, molten salt, thermodynamic modelling
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-118204DOI: 10.1016/j.jct.2006.12.018ISI: 000248508500002OAI: oai:DiVA.org:umu-118204DiVA: diva2:918850
Available from: 2016-04-12 Created: 2016-03-14 Last updated: 2016-04-12Bibliographically approved

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