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Study of phase equilibria in the CO(NH2)2-KH2PO4-K2HPO4-H2O system at 25°C using an optimized method of cross sections

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Abstract

Phase equilibria are studied in ternary contouring systems and in the CO(NH2)2-KH2PO4-K2HPO4-H2O quaternary system at 25°C using an optimized method of cross sections. It is found that an incongruent chemical compound forms between the components of a system with the composition 2KH2PO4 · K2HPO4. The compositions of eutonic and peritonic solutions and the solid phases saturating them are determined. The lines of monovariant equilibria and the crystallization surface of potassium dihydrogen phosphate are studied. The location of the eutonic and peritonic solutions and monovariant equilibrium lines near the plane are shown.

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Authors and Affiliations

  1. Perm State National Research University, Perm, 614068, Russia

    M. N. Noskov & S. A. Mazunin

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  1. M. N. Noskov
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  2. S. A. Mazunin
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Correspondence to M. N. Noskov.

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Original Russian Text © M.N. Noskov, S.A. Mazunin, 2015, published in Zhurnal Fizicheskoi Khimii, 2015, Vol. 89, No. 6, pp. 971–977.

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Noskov, M.N., Mazunin, S.A. Study of phase equilibria in the CO(NH2)2-KH2PO4-K2HPO4-H2O system at 25°C using an optimized method of cross sections. Russ. J. Phys. Chem. 89, 1011–1017 (2015). https://doi.org/10.1134/S0036024415060217

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  • DOI: https://doi.org/10.1134/S0036024415060217

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