Estimation of kinematic viscosities at high pressures for binary mixtures CO2 + solvent using modified Eyring–Wilson and McAllister models

Abstract

ABSTRACTThis work reports an estimation of kinematic viscosities at high pressures for binary mixtures of carbon dioxide (CO2) + solvent using the modified Eyring–Wilson model, by introducing each empirical equation as a function of temperature and pressure to both the binary interaction parameters in the Wilson model over wide temperature and pressure ranges. Binary mixtures tested for the estimation are CO2 + acetone, + water, + alcohol, and hydrocarbon with 60 data sets, and the covered temperature and pressure ranges are 296–473 K, and 0.77–120.86 MPa, respectively. The modified Eyring–Wilson model shows reasonable agreements with the experimental data, giving 8.03% of the average absolute relative deviations (AARD) for all the data sets studied. While the accuracy of the McAllister model, also introducing the functions of temperature and pressure to the binary interaction parameters in the same manner as in the Wilson model, showed lower AARD value (6.47%), the significant deviations were seen at higher temperatures. We conclude that the modified Eyring–Wilson with the newly proposed temperature and pressure dependencies of the binary parameters is effective for the estimation of the kinematic viscosities for binary mixtures CO2 + solvent over wide temperature and pressure ranges.