Solid鈥揕iquid Equilibrium (SLE) of the N,N-Dimethylacetamide (DMA) + MCl (M = Na, K, Rb, and Cs) + Water Ternary Systems at Multiple Temperatures

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• 作者：Dandan Zhao ; Shu鈥檔i Li ; Quanguo Zhai ; Yucheng Jiang ; Mancheng Hu
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2014
• 出版时间：May 8, 2014
• 年：2014
• 卷：59
• 期：5
• 页码：1423-1434
• 全文大小：544K
• 年卷期：v.59,no.5(May 8, 2014)
• ISSN：1520-5134

文摘

We report herein the solid鈥搇iquid equilibria (SLE) of N,N-dimethylacetamide (DMA) + MCl (M = Na, K, Rb, and Cs) + H₂O ternary systems for the first time. At the three given temperatures (T = 298.15 K, 308.15 K, and 318.15 K), the solubilities, densities, and refractive indices for these ternary systems are determined with the mass fraction of DMA in salt-free solvent system ranging from 0.0 to 1.0. The solubility of salts decreases significantly with the addition of DMA, and the salting-out ratios are calculated accordingly. The nonrandom two-liquid (NRTL) model can effectively fit the experimental solubility. Furthermore, to investigate the temperature effect on the SLE, the dynamic solubility measurement system is selected to determine the solubility of the salts in the mixed solvent (w_DMA = 0.3, 0.5, and 0.7) with the temperature continuously increased. The solubility data at multiple temperatures are well fitted by the modified Apelblat equation and the 位h equation.