Estimation of wilson parameters

Abstract

Lately the Wilson equation has been very often used in the calculation of vapor-liquid equilibrium. However, it is not easy to obtain the parameters Λifand Λji, which can be determined from the binary data only. This is mainly due to nonlinearity with - respect to the parameters. We present some procedures to evaluate the Wilson parameters. When a large number of data points are available, the nonlinear least-squares technique coupled with the Q function as an objective function is to be preferred over any other techniques. Using the parameters determined from the binary data, we predicted vapor-liquid equilibria for five ternary systems at one atmosphere. The results indicate that the procedures used are of sufficient accuracy for most practical purposes. © 1971, The Society of Chemical Engineers, Japan. All rights reserved.