Volumetric properties of aqueous sodium sulfate solutions at high temperatures and pressures

Abstract

Sodium sulfate is one of the main impurities of aqueous heat carrier of steam turbine power units. The study of the thermodynamic properties of aqueous sodium sulfate solutions was motivated by practical needs and by the necessity for decreasing corrosion of thermal power equipment, concentration, and scaling of heat-exchanger surface. In this work they studied the volumetric properties of aqueous sodium sulfate solutions at temperatures 323-573/sup 0/K, pressures 10-80 MPa, and concentrations 0.05-0.3 mole/kg of H/sub 2/O. The measurements were performed on a setup based on the method of study of volumetric properties using a constant volume piezometer. For the preparation of the solutions ultrapure 6-4 grade sodium sulfate was used. The concentration of the solutions was determined gravimetrically. The PVTX data obtained experimentally are furnished.