A simple formula for the Gilliland correlation in multicomponent distillation.

Past attempts to represent the Gilliland correlation by an analytic expression were not satisfactory. A much simpler equation which should be just as accurate is given in this paper. The Gilliland correlation was plotted in the literature either on regular or on log/log graph paper. In this paper a linear plot of the correlation was achieved by plotting it on a specially prepared graph paper where the ordinate is linear and the abscissa is non-linear. The distances at which the graduations are marked on the x axis were obtained from a derived equation. (from authors' abstract)