Journal of Guangxi Normal University(Natural Science Edition) ›› 2015, Vol. 33 ›› Issue (4): 87-95.doi: 10.16088/j.issn.1001-6600.2015.04.015

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A Comparative Study on Salt Solubility, Densities and Refractive Indices in Ternary Systems Composed of Alkali Metal (Na, K, Rb, and Cs) Nitrate, Alcohol, and Water

ZHANG Hui-ying, LIU Rui-qiang   

  1. School of Environment and Natural Resources, The Ohio State University, Columbus, OH 43210, United States
  • Received:2015-05-27 Online:2015-12-25 Published:2018-09-21

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Abstract: This paper reports the changes of salt solubility, solution density and the solution refractive index (RI) with changes of the alcohol concentration (mass fraction covering a wide range of 0~100%) in ternary solution systems composed of alkali metal (Na, K, Rb, or Cs, respectively) nitrate, alcohol (ethylene glycol, 1, 2-propanediol or glycerol, respectively) and water at different temperatures. Experimental results from the saturated systems showed that the salt solubility and solution density generally decreased with the increase of alcohol content in a system while the changing trend of RI with alcohol was just the opposite. Moreover, alcohols containing more hydroxyl groups usually resulted in higher salt solubility, solution density and solution RI than those containing less of this group. In addition, temperature tested in a range from 288 to 318 K had little impact on these parameters of the ternary systems. This report provides the basic experimental data on the primary physicochemical properties of alkali metal salts-alcohol-water ternary systems, which are important for industrial applications of alkali metal salts separation and purification among others.

Key words: alkali metal nitrade, salting-out rate, density, refractive index, alcohol

CLC Number: 

  • O616
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