An improved dynamic model of nonideal multicomponent distillation column is presented in this paper

in which the simultaneous effects of mass and heat transfer

tray hydraulics

tray efficiency and reboiler dynamics are taken into account. It overcomes the shortcomings of the model derived in a previous paper[1]

by adding vapor-liquid equilibrium bubble-point calculation. Therefore

higher accuracy and greater usefulness of the model have been achieved. It can be used to simulate the distillation column which separates either an ideal system or a highly nonideal system. The Gears procedure is adopted as a simulation method for its stable property. It is very effective for solving the differential equations with high stiffness ratio. An acrylonitrile extractive distillation column is taken as an example to verify the model given here. The model can really represent the actual dynamics of the distillation column.