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The system dipotassium hydrogen phosphate-water at high temperatures (100–400°C); Liquid-liquid immiscibility and concentrated solutions

Authors
Journal
Journal of Inorganic and Nuclear Chemistry
0022-1902
Publisher
Elsevier
Publication Date
Volume
43
Issue
3
Identifiers
DOI: 10.1016/0022-1902(81)80482-4

Abstract

Abstract Phase equilibrium behavior in the condensed system K 2HPO 4H 2O was determined at temperatures from 100 to 400°C. Solutions saturated with a solid, which is believed to be (nearly) anhydrous K 2PO 4, increase in K 2HPO 4 content from 72 wt% at 100°C to 78 wt% at 400°C. A region of liquid-liquid immiscibility at compositions between 3 and 58 wt% was discovered, with a minimum temperature of 360°C. Separate experiments with saturating solids K 3PO 4, K 2HPO 4, and KH 2PO 4 at 350°C indicated that each of these solids are in stable equilibrium with the solution phase, thus with no conversion to polyphosphate species.

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