Article ID Journal Published Year Pages File Type
4768082 Fluid Phase Equilibria 2017 7 Pages PDF
Abstract
Solid-liquid equilibria of (KCl + NH4Cl + H2O) ternary system were investigated and it was found that there were five crystalline regions in the course of crystallization (respectively pure NH4Cl, mNH4Cl·KCl solid solution, NH4Cl·nKCl solid solution, mixed mNH4Cl·KCl and NH4Cl·nKCl solid solution and pure KCl). The type of two solid solutions was determined by analysis of X-ray diffraction (XRD), Fourier transform infra-red (FTIR), lattice constant and density of solid solution crystals. It could conclude that they were limited substitutional solid solutions. Solid solubility (substitutional impurity in solvent) was measured at 25 °C and its variation was in accordance with Vergard's law. Moreover, thermal stability of two solid solutions was compared by TG-DTA. Results showed that both mNH4Cl·KCl and NH4Cl·nKCl shared the property of their mother phase and maintained its individual characteristics.
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Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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