Phase equilibria and phase diagrams of the ternary system NaNO3 + Sr(NO3)2 + H2O: Experimental insights and industrial applications at 298.15 and 338.15 K

IF 3.1 2区化学 Q2 CHEMISTRY, ANALYTICAL Thermochimica Acta Pub Date : 2025-01-15 DOI:10.1016/j.tca.2025.179937

Xinru Li, Jiaqi Wang, Linxue Yan, Can Liu, Yafei Guo, Tianlong Deng

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Abstract

In this study, the isothermal dissolution and wet solid phase methods (Schreinemarkers rule) were applied to systematically investigate (NaNO₃ + Sr(NO₃)₂ + H₂O) ternary system at 298.15 and 338.15 K, to develop a green separation of Sr(NO₃)₂. The phase diagrams and thermodynamic models were designed on the basis of experimental data to elucidate the system's behavior under varying conditions. The phase diagram and physicochemical property diagrams indicate that no complex salts or solid solutions are formed, confirming the system's classification as a simple type. The invariant point (E), consisting solely of NaNO₃ and Sr(NO₃)₂ crystals, was identified using the REFLEX module in Material Studio. An optimized separation process for mixed NaNO₃ and Sr(NO₃)₂ solutions was established, reaching a 96.76 % separation efficiency for Sr(NO₃)₂. This study offers an eco-friendly and efficient approach for recovery of Sr(NO₃)₂ from sodium nitrate eluate, providing a reliable solution for industrial applications.

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来源期刊

Thermochimica Acta 化学-分析化学

CiteScore

6.50

自引率

8.60%

发文量

210

审稿时长

40 days

期刊介绍： Thermochimica Acta publishes original research contributions covering all aspects of thermoanalytical and calorimetric methods and their application to experimental chemistry, physics, biology and engineering. The journal aims to span the whole range from fundamental research to practical application. The journal focuses on the research that advances physical and analytical science of thermal phenomena. Therefore, the manuscripts are expected to provide important insights into the thermal phenomena studied or to propose significant improvements of analytical or computational techniques employed in thermal studies. Manuscripts that report the results of routine thermal measurements are not suitable for publication in Thermochimica Acta. The journal particularly welcomes papers from newly emerging areas as well as from the traditional strength areas: - New and improved instrumentation and methods - Thermal properties and behavior of materials - Kinetics of thermally stimulated processes