Abstract
The binodal curves, tie-line compositions and cloud point data as a function of temperature and concentration were measured for aqueous two phase systems composed of acetonitrile (ACN)+K2CO3+H2O, ACN+Na2CO3+H2O, 1-methyl-2-pyrrolidone (NMP)+K2CO3+H2O and NMP+Na2CO3+H2O. Additionally, salting-out ability of sodium sulfite, sodium thiosulfate and sodium tartrate was studied. The free energy, enthalpy and entropy of clouding point (CP) estimated using a simple method, and the driving force of the two-phase formation process was discussed on the base of the estimated free energy values. Also, an empirical equation was modified as a function of organic solvents density and dielectric constants and used for the simultaneous correlation of all experimental binodal data. Furthermore, e-NRTL and e-Wilson models were used for the correlation of tie-line compositions. The obtained results confirm the high performance of these models in the correlation of binodal and tie-line data.
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