【摘 要】
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It is still a challenging task to accurately and temperature-continuously express the thermodynamic properties and phase equilibrium behaviors of the salt-lake
【机 构】
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College of Chemical Engineering and Materials Science,Tianjin Key Laboratory of Brine Resources and
论文部分内容阅读
It is still a challenging task to accurately and temperature-continuously express the thermodynamic properties and phase equilibrium behaviors of the salt-lake brine with multi-component,multi-temperature and high concentration.The essential subsystem of sulfate type brine,aqueous Li+-Na+-K+-SO42-and its subsystems across a temperature range from 250 K to 643 K are investigated with the improved comprehensive thermodynamic model.Liquid parameters(ΔgIJ,ΔhIJ,and ΔCp,IJ)associated with the contributions of Gibbs energy,enthalpy,and heat capacity to the binary interaction parameters,i.e.the temperature coefficients of eNRTL parameters formulated with a Gibbs Helmholtz expression,are determined via multi-objective optimization method.The solid constants ΔfGk°(298.15)and ΔfHk°(298.15)of 11 solid species occurred in the quaternary system are rebuilt from multi-temperature solubilities.The modeling results show the accurate representation of(1)solution properties and binary phase diagram at temperature ranges from eutectic points to 643 K;(2)isothermal phase diagrams for Li2SO4-Na2SO4-H2O,Li2SO4-K2SO4-H2O and Na2SO4-K2SO4-H2O ternary systems.The predicted results of com-plete structure and polythermal phase diagram of ternary systems and the isothermal phase diagrams of quaternary system excellently match with the experimental data.
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