Abstract
The effect of pressure on the phase diagram of (H 2O + Na 2SO 4) system has been investigated at temperatures from 263 to 343 K and pressures up to 500 MPa. This system forms an intermolecular compound Na 2SO 4·10H 2O. The sodium sulfate decahydrate has an incongruent melting point at 305.5 K at atmospheric pressure. The present study was undertaken to obtain extensive and accurate data concerning the effect of pressure on two kinds of solid-liquid phase equilibria, namely, the solubility curve and the incon-gruent melting point (peritectic point) of Na 2SO 4·10H 2O. The solid-liquid equilibrium measurements were performed by the direct visual observation of the crystal growth and disappearance using a high-pressure optical vessel. The uncertainties in measurements of temperature, pressure, and composition are within 0.1 K, 0.5 MPa and 0.001 mole fraction, respectively. It was found that both the solubility curve and the incongruent melting temperature of Na 2SO 4·10H 2O decrease with increasing pressure. The solid-liquid coexistence curves were correlated by an empirical equation.
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