Prediction of surface tension of naphtha reformate using UNIFAC

Abstract

AbstractThe surface tension of naphtha reformate cuts (60−170°C) were predicted using a modified UNIFAC group contribution method. The naphtha was distilled into eleven cuts of 10°C intervals to obtain narrow boiling range cuts. The surface tensions were determined in the temperature range 10−50°C and were compared with predicted values. A standard deviation of 5.9% was found using this method, versus 3.7% when the corresponding states method was used over the temperature range of 60−170°C. However, for the higher temperature range of 140−170°C, this method gave a standard deviation of 2.9% versus 7.6% for the other method.