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Study and modeling of the liquid–solid equilibrium of the KCl–KNO 3 –HCl–H 2 O system at 283.15 K
Author(s) -
Wang Houpeng,
Zhou Zhiyong,
Qin Wei,
Li Yigui,
Fei Weiyang
Publication year - 2020
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16750
Subject(s) - pitzer equations , chemistry , solubility equilibrium , thermodynamics , activity coefficient , eutectic system , solubility , phase diagram , aqueous solution , equilibrium constant , phase (matter) , analytical chemistry (journal) , inorganic chemistry , chromatography , crystallography , organic chemistry , physics , microstructure
In this work, the liquid–solid equilibrium of the KCl–KNO 3 –HCl–H 2 O system at 283.15 K was investigated. To calculate the solubility product constants of KCl and KNO 3 in HCl solution, the Pitzer equation was used to calculate the activity coefficient of the ionic species in aqueous solution. In addition, the thermodynamic model with the Pitzer equation was constructed to regress the temperature coefficient parameters for HCl and HNO 3 . The calculation and prediction of the KCl–KNO 3 –HCl–H 2 O system using the results of the regression confirmed that the regression was successful and the Pitzer equation was suitable. For the reaction KCl(s) + HNO 3 → KNO 3 (s) + HCl , the equilibrium constant K can be obtained from the solubility product constants of KCl and KNO 3 . Eutectic points for the KCl–KNO 3 –HCl–H 2 O system were also predicted. These equilibrium data could be expressed by the triangular phase diagram. The process of the reaction to produce KNO 3 could be explained through this triangular phase.