STATISTICAL THERMODYNAMIC MODEL FOR VISCOSITY OF PURE LIQUIDS AND LIQUID-MIXTURES

On the basis of statistical thermodynamics, local compositions, and Eyring's absolute rate theory, a new viscosity model for pure liquids and liquid mixtures has been developed. The model can be used to describe the viscosity of pure liquids at different temperatures and of liquid mixtures at different compositions and temperatures. Correlation of viscosity data of 314 pure liquids and of 215 binary systems and prediction of viscosities for 14 ternary systems and 1 quaternary system have been carried out. The pure liquids include water, alcohols, organic acids, ketones, ethers, acetates, aldehydes, amines, aromatics, and other hydrocarbons, and the binary and multicomponent systems include mixtures with nonpolar + nonpolar, polar + polar, and nonpolar + polar components. The overall average MRSD (mean relative standard deviation) of the correlations of the pure liquid viscosities is 1.13%, and that of the binary systems is 0.80%. The overall average MRSD of the predictions of the multicomponent systems is 2.90%.