Phase Equilibrium and Crystallization Process of the Ternary System KCl-(NH2)2CO-H2O at Different Temperatures

The phase equilibriums of the ternary system KCl-(NH2)2CO-H2O at 303.15 K, 323.15 333.15 and 343.15 K were studied using isothermal dissolution equilibrium method, in which composition solid was determined by Schreinemaker’s wet residue method X-ray diffraction (XRD) method. It found that is a simple cosaturated system, without formation neither double salt nor solution. Wilson NRTL models employed to correlate solubility data experimental temperatures. maximum values RAD RMSD model 2.18 × 10−2 0.83 those 1.69 0.40, respectively. two utilized forecast various temperatures, obtained outcomes line with literature data. Based on cooling crystallization process monitored online focused beam reflectance measurement (FBRM) particle video microscope (PVM). crystal products characterized XRD, scanning electron (SEM), energy dispersive spectrometry (EDS). results showed precipitation (NH2)2CO occurred during process, this followed KCl. KCl formed surface crystal. mixture containing (NH2)2CO.