A new method for predicting viscosity of pure organic liquids

Abstract

A new semi-theoretical method based on Enskog's hard sphere theory for dense fluids and the principle of corresponding states is presented for predicting viscosity of pure organic liquids. The viscosities of 75 organic liquids -37 acyclic and 38 cyclic hydrocarbonswere calculated using this method which requires critical properties and normal boiling point as input data. The predictions were compared with empirical data and other prediction methods. Highly satisfactory results were obtained over a wide range of temperatures (0.45 < T,. < 0.80).Une nouvelle methode semi-theorique, s'appuyant sur la theorie des spheres dures d'Enskog pour des fluides denses et le principe des etats correspondants, est presentee en vue de predire la viscosite des liquides organiques purs. On a calcule les viscosites de 75 liquides organiques -37 hydrocarbures acycliques et 38 cycliquesau moyen de cette methode, les proprietes critiques et le point d'ebullition normal etant utilises comme donnees d'entree. Les predictions ont ete comparees a des donnees empiriques et aux resultats d'autres methodes de prediction. Des resultats hautement satisfaisants ont ete obtenus pour une vaste gamme de temperatures (0,45 < T,. < 0,80). Keywords: organic liquid viscosity, prediction of organic liquid viscosity. iscosity of pure compounds and their mixtures is an I48 A.A.D. (%) = 6.51. M.A.D. (%) = 41.04 (observed for Cyclohexane at 287.82 K). Correlation coefficients are 0.9953 and 0.9892 for Equations (19) and (20), respectively. Results and discussion Empirical dynamic viscosity calculations of 75 organic liquids were obtained by utilizing data compiled by Viswanath and Natarajan (1989), van Velzen et al. (1972) and API Research Project 44 (1955). Results for acyclic and I52