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Published: Kem. Ind. 63 (9-10) (2014) 345-354
Paper reference number: KUI-15/2014
Paper type: Professional paper
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Phase Equilibrium of NaNO3/KNO3 in Glycerol + H2O Mixed Solvent System at 288.15 K and 298.15 K

H. Y. Zhang, W. W. Zhu, G. L. Qin and Z. Wei


Solubility, density, and refractive index were determined for the ternary systems of NaNO3/KNO3 + glycerol + H2O at 288.15 K and 298.15 K. The solubility of the salts was calculated by the method of combining density and refractive index. In all cases the solubility of the salts decreased with the increase in glycerol content. A reverse trend for the refractive indices was observed. However, NaNO3 density tended to decrease and KNO3 density tended to increase with the addition of glycerol in the solution. Moreover, the experimental data were correlated using a four-parameter and seven-parameter empirical equation for the saturated and unsaturated solutions, respectively. Therefore, research of such kind of system has potential theoretical and practical application for the purification process and thermodynamic chemistry.

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sodium nitrate, potassium nitrate, glycerol, solubility, density, refractive index