Volumetric properties of dilute (d-glucose + H2O) solutions at temperatures from (293.15 to 433.15) K and pressures from (0.10 to 50.00) MPa

The densities of aqueous solutions of D-glucose were measure at temperatures from (293.15 to 433.15) K and pressures from (0.10 to 50.00) MPa using a vibrating-tube densimeter. Apparent molar volumes Vφ,m and partial molar volumes at infinite dilution V∞ were calculated from the experimental results. V∞ increases as temperature increases and varies linearly with temperature above ~300 K. In addition, V∞ does not vary as a function of pressure up to 50.0 MPa. Comparison of these results with previous studies indicate excellent agreement and significantly extend the experimental database for aqueous solutions of D-glucose to elevated temperatures and pressures. Methods Density measurements were obtained with a commercially available Anton Paar vibrating-tube densimeter (DMA HP). A high pressure fluid manifold was constructed to deliver the fluids to the densimeter. Densities of pure water and aqueous D-glucose solutions were experimentally measured. The apparent molar volumes calculated from the experimentally-determined density data using the molar mass of D-glucose (180.15588 g·mol-1). The partial molar volume at infinite dilution was determined from the intercept of a least squares fit of the apparent molar volume (at constant pressure and temperature).