Phase equilibria in aqueous sodium phosphate solutions at elevated temperatures
- 1 January 1977
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 5,p. 464-468
- https://doi.org/10.1039/dt9770000464
Abstract
Solubility and phase studies for the system Na2O–P2O5–H2O have been carried out at 251 and 300 °C and at the vapour pressures of the solutions. The experiments have been largely confined to the region of composition between the mol ratio Na2O : P2O5= 1.8 and 10.0. At both temperatures, the more alkaline saturated solutions are in equilibrium with a solid phase, 11 Na2O·4P2O5·3H2O, a complex orthophosphate. The less alkaline saturated solutions are in equilibrium with Na2[HPO4] at 251 °C, and with Na4[P2O7] at 300 °C. However, at the higher temperature, a region of liquid–liquid immiscibility also exists.Keywords
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