Measurements and prediction of dynamic viscosity of binary mixtures of carbon dioxide and methanol, ethanol and 1-propanol at 313–343 K and 15–30 MPa

Abstract

The dynamic viscosity η_m of binary mixtures of carbon dioxide and methanol/1-propanol was measured on the basis of the pressure drop in a packed bed, which was calculated using the Ergun equation, at temperatures from 313.2 K to 343.2 K and pressures from 15 MPa to 30 MPa over the entire range of methanol/1-propanol composition. The accuracy of the rough-hard-sphere (RHS) model with various combining rules was tested and compared with that of the Eyring theory with the perturbed-chain SAFT (PC-SAFT) equation of state (EoS) model the authors proposed previously. The average relative deviations (ARD) of the RHS model with the Fender-Halsey combining rule and the interaction parameter value adjusted were 5.0 % (max.RD: 23 %), for 240 sets of conditions over the entire range of methanol/ethanol/1-propanol compositions, as compared with 6.3 % (max.RD: 26 %) of the Eyring theory with PC-SAFT EoS model with the optimized k_Eyring value.