Calculation of solid-liquid equilibria in aqueous solutions of nitrate salts using an extended UNIQUAC equation

✍ Scribed by Bo Sander; Peter Rasmussen; Aage Fredenslund

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 610 KB
• Volume: 41
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(86)87092-0

✦ Synopsis

An extended UNIQUAC-Debye-Hiickel model is used to predict solid-liquid equilibria for aqueous solutions of nitrate salts with the cations K+, big*+ and Ca2 + . In addition to a model for activity coefficients in mixed electrolyte solutions, the method requires knowledge of the solubility products of all possible solid phases. Furthermore, some ternary solid-liquid equilibrium data are required. It is shown that the extended UNIQUAC equation can be applied to the calculation of solid-liquid equilibria in the K+-Mg"-Ca '+-NOT-HZ0 system with good results. A new algorithm for calculation of solid-liquid equilibrium in ionic solutions has been proposed. The number and amount of phases in equilibrium are found by minimization of the total Gibbs function of the system.