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 3.6 2区化学 Q2 CHEMISTRY, ANALYTICAL Thermochimica Acta Pub Date : 2025-03-01 Epub 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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纳米3 + Sr(NO3)2 + H2O三元体系的相平衡和相图：298.15和338.15 K下的实验见解和工业应用

本研究采用等温溶解法和湿固相法（Schreinemarkers规则）对298.15 K和338.15 K下的（NaNO3 + Sr(NO3)2 + H2O）三元体系进行了系统研究，建立了Sr(NO3)2的绿色分离方法。在实验数据的基础上，设计了相图和热力学模型来阐明系统在不同条件下的行为。相图和理化性质图表明，没有形成复杂的盐或固溶体，证实了该体系属于简单型。不变点(E)仅由NaNO3和Sr(NO3)2晶体组成，使用Material Studio中的REFLEX模块确定。建立了NaNO3与Sr(NO3)2混合溶液的优化分离工艺，Sr（NO₃）2的分离效率达到96.76%。本研究为从硝酸钠洗脱液中回收Sr(NO3)2提供了一种环保高效的方法，为工业应用提供了可靠的解决方案。

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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