To improve the convergence in the simulation work for simulating a distillation apparatus equipped with a combined distillation tower.
The simulation of the distillation apparatus equipped with the combined distillation tower is carried out using a simulation program for the distillation apparatus equipped with a main tower and a side tower. The simulation work is carried out by inputting the liquid distribution ratio of the combined distillation tower as the liquid distribution ratio of the flow rate of each liquid which distribution ratio has been set for distribution the liquid descending from the top of the main tower into the liquid descending through the feed side and the liquid descending through the side cut side and calculating the steam distribution ratio of the combined distillation tower corresponding to the liquid distribution ratio for distributing the steam ascending from the tower bottom into the steam ascending through the feed side and the steam ascending through the side cut side.
OKUMA YURIE
TAMURA KATSUNORI
HARADA YOICHI
SUMITOMO HEAVY INDUSTRIES