A new method is presented in this paper for predicting the Murphree point efficiencies of nonideal multicomponent mixtures in distillation.In the method based on the film model

the interphase mass transfer in the bubbling liquid on the distillation tray is calculated in full consideration of highly nonlinear dependence of the transfer fluxes of individual component on mixture composition which changes along the diffusion path in the film.The interfacial area is calculated based on the principle of multiphase turbulence dynamics The calculation results for six multicomponent mixtures show that the new method can not only predict the bizarre point efficiencies of some species

but also give more accurate and reliable theoretical prediction than other existing methods.So the new model proves a better one for predicting the point efficiencies of the nonideal multicomponent distillation systems.