Immiscibility of Liquid Phases and Liquid–Liquid Critical Phenomena in Aqueous Solutions of Sodium and Potassium Phosphates


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Abstract

Phase equilibria were studied in aqueous solutions of sodium and potassium phosphates at elevated temperatures (to 425°C) and pressures (to 63 MPa). Experimental data were obtained on the transformation of gas–liquid equilibria into heterogeneous equilibria of two liquid phases with increasing pressure, which ends in the critical phenomena of immiscibility (L1 = L2). Based on the experimental and literature data, it was concluded that the binary water–salt systems containing KH2PO4, K2HPO4, K3PO4, NaH2PO4, and Na2HPO4 are characterized by phase diagrams of the first type [1, 2], which have two critical invariant end points: N (G–L1 = L2) and R (G = L1–L2).

About the authors

M. A. Urusova

Kurnakov Institute of General and Inorganic Chemistry

Email: valyashko@igic.ras.ru
Russian Federation, Moscow, 119991

V. M. Valyashko

Kurnakov Institute of General and Inorganic Chemistry

Author for correspondence.
Email: valyashko@igic.ras.ru
Russian Federation, Moscow, 119991

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