Prediction of DES' vapor pressure using a new corresponding state model

Application of deep eutectic solvents (DES) in industrial chemical processes has been improved during the last decades. In this work, vapor pressures of 13 classes of DESs (DES 1-13) based on 5 salts and 7 hydrogen bond donors with various combinations of molar ratio were used between 343-393 K. The vapor pressures of the pure and aqueous solutions of DESs were calculated by different equations of state based on "ϕ-ϕ" or "γ-ϕ" γ-ϕ approaches. Additionally, the Voutsas and Wagner models as corresponding-state models were modified to predict the vapor pressure of the pure and aqueous solutions of DES with the total average absolute relative deviations of 7.03, 9.08% and 5.47, 7.15%, respectively. Moreover, the validity of vapor pressure calculation using the two modified models was checked using a linear equation for the average specific heat capacity of different DESs (23 classes of DESs) between 278.15-353.15 K. Results showed that the total average absolute relative deviations of the specific heat capacity of DESs, using the Modified-Voutsas and Modified-Wagner models from the experimental data, were 4.128 and 4.056%, respectively.