Vapor Liquid Equilibrium of Dilute Solutions by the Limiting Values From the Gas Chromatographic Measurements

This paper proposes a new equation for the determination of the. limiting slope of activity coefficient vs mole fraction (dln gamma(1)/dx(1))x(1-0) from gas chromatography measurements, the equation has been rigorously derived and is convenient to he applied. A method to predict the vapor liquid equilibrium of dilute solutions front the infinite dilute activity coefficient gamma(infinity)(1) and (dln gamma(1)/dx(1))(x1-0) has also been presented by virtue of the activity coefficient models for dilute solutions proposed recently. The results of predictions for 7 systems are satisfactory in comparison with those from direct measurements by the GC method. Finally, our model fur (dlo gamma(x)/dx(1))x(1-0) is compared with that proposed by Valentin And Guiochon, and the results show that our model is a good improvement.