A new method for predicting saturated liquid viscosity at temperatures above the normal boiling point

A new temperature viscosity relationship similar to the Rackett equation fo r saturated liquid volumes is proposed for predicting saturated liquid visc osity at temperatures above the normal boiling point. The first order group contribution Values proposed earlier by the authors for predicting the vis cosity at the normal boiling point are revised. Combining these two, the vi scosities of organic liquids can be predicted at any temperature above the normal boiling point using the normal boiling point, critical temperature a nd chemical structure only as inputs. The accuracy of the correlation compa res favourably with those used for the low temperature region. It is observ ed that the three properties, volume, thermal conductivity and viscosity, o f saturated liquids can be predicted by using the same generalised empirica l approach starting from a form of the Rackett equation. (C) 2000 Elsevier Science B.V. All rights reserved.