The prediction of the amount of salt sediment in the electrolyte solutions with the extended equation of states based on Peng Robinson equation of state
Keywords:
Electrolyte solutions, Equation of states, Peng Robinson, Salt sediment, Solid- liquid equilibriumAbstract
The solubility of several salt in different electrolyte solutions is modeled by using the proposed equation of state. The modified Peng-Robinson equation of state, Born and MSA terms, were used at this model. To do this modeling, a large number of experimental data has been collected for electrolyte systems. At this modeling, optimization based on salt has used and van der Waals attraction parameter, van der Waals excluded-volume parameter, ion diameter and binary interaction parameter between the molecule-salt have been optimized by fitting experimental data of liquid density and average mean ionic activity coefficients over wide range of temperatures. The Average relative deviation for prediction of salt solubility in the electrolyte solutions, for potassium dichromate solution, potassium chlorate solution, potassium nitrate solution, ammonium chloride solution, sodium sulfate solution, potassium iodide solution, sodium nitrate solution, potassium sulfate solution is obtained 2.23% ,1.16% ,1.28% ,1.93 %, 1.34 %, 2.28%, 2.57%, 1.03% respectively. The solubility of three-component systems were also predicted with good accuracy. The solubility of salts in ternary systems was also predicted with high accuracy. The results showed that this model could predict solid-liquid equilibrium behavior over a wide range of temperature and pressure.
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