Solid鈥揕iquid Equilibria in the Systems CaBr2鈥揗gBr2鈥揌2O and NaBr鈥揔Br鈥揝rBr2 at 348 K

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• 作者：Juan-Xin Hu ; Shi-Hua Sang ; Ting-Ting Zhang ; Rui-Zhi Cui ; Dan Wang ; Xue-Ping Zhang
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2015
• 出版时间：November 12, 2015
• 年：2015
• 卷：60
• 期：11
• 页码：3087-3092
• 全文大小：279K
• ISSN：1520-5134

文摘

The solid鈥搇iquid equilibria in the ternary system CaBr₂鈥揗gBr₂鈥揌₂O and quaternary system NaBr鈥揔Br鈥揝rBr₂鈥揌₂O at 348 K were determined with the method of isothermal solution saturation. Also determined are the densities of saturated solutions. The phase diagram of the ternary system CaBr₂鈥揗gBr₂鈥揌₂O has two invariant points, three univariant curves and three crystallization fields (which are saturated with MgBr₂路6H₂O, 2CaBr₂路MgBr₂路12H₂O, and CaBr₂路2H₂O, respectively). The phase diagram of the quaternary system NaBr鈥揔Br鈥揝rBr₂鈥揌₂O includes one invariant point, three univariant curves and three crystallization fields (which are saturated with SrBr₂路6H₂O, NaBr, and KBr, respectively). On the basis of the extended Harvie鈥揥eare (HW) model and its temperature-dependent equation, the mixing ion interaction parameters 胃_Mg,Ca, 唯_Mg,Ca,Br and the dissolution equilibrium constant K for MgBr₂路6H₂O, CaBr₂路2H₂O, and 2CaBr₂路MgBr₂路12H₂O in the ternary system at 348 K were fitted by using the Pitzer equations and the multiple linear regression method. A chemical model was constructed to calculate the solubility curves by using the Pitzer equations in the ternary systems MgBr₂鈥揅aBr₂鈥揌₂O at 348 K. The calculated solubilities are in agreement with experimental data.