Scholarlink

<p>Available thermodynamic data for (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>(aq) have been critically evaluated and used to parameterize an extended ion interaction (Pitzer) model. The model satisfactorily represents the available activity and thermal data from below the eutectic temperature to 110&#xa0;°C. At near ambient temperatures (5–40&#xa0;°C) the model accurately predicts the water activities in supersaturated solutions to about 30&#xa0;mol·kg<sup>–1</sup>. The model has been used to determine the solubility products of (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>(s) from the eutectic temperature to 110&#xa0;°C. Solubilities in the ternary Tutton salt forming systems (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>–MgSO<sub>4</sub>–H<sub>2</sub>O, (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>–FeSO<sub>4</sub>–H<sub>2</sub>O, (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>–ZnSO<sub>4</sub>–H<sub>2</sub>O, and (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>–CuSO<sub>4</sub>–H<sub>2</sub>O have been used to determine the ternary interaction parameters in the Pitzer model and to calculate the solubilities and deliquescence humidities of the Tutton salts (NH<sub>4</sub>)<sub>2</sub>M<sup>II</sup>SO<sub>4</sub>·6H<sub>2</sub>O (with M = Mg, Fe, Zn, Cu). Using additional literature data of decomposition vapor pressures, the phase diagrams of the Tutton salts have been established and the suitability of the salts as thermochemical heat storage materials has been critically evaluated.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Thermodynamics of (NH4)2SO4(aq) and Solubilities of (NH4)2MII(SO4)2·6H2O (M = Mg, Fe, Zn, Cu) Tutton Salts with Implications to Thermochemical Storage

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年2月4日

查看全文
  • Tanya Talreja-Muthreja,
  • Michael Steiger

摘要

Available thermodynamic data for (NH4)2SO4(aq) have been critically evaluated and used to parameterize an extended ion interaction (Pitzer) model. The model satisfactorily represents the available activity and thermal data from below the eutectic temperature to 110 °C. At near ambient temperatures (5–40 °C) the model accurately predicts the water activities in supersaturated solutions to about 30 mol·kg–1. The model has been used to determine the solubility products of (NH4)2SO4(s) from the eutectic temperature to 110 °C. Solubilities in the ternary Tutton salt forming systems (NH4)2SO4–MgSO4–H2O, (NH4)2SO4–FeSO4–H2O, (NH4)2SO4–ZnSO4–H2O, and (NH4)2SO4–CuSO4–H2O have been used to determine the ternary interaction parameters in the Pitzer model and to calculate the solubilities and deliquescence humidities of the Tutton salts (NH4)2MIISO4·6H2O (with M = Mg, Fe, Zn, Cu). Using additional literature data of decomposition vapor pressures, the phase diagrams of the Tutton salts have been established and the suitability of the salts as thermochemical heat storage materials has been critically evaluated.