CORRECTED FLOWRATES ESTIMATION BY USING theta CONVERGENCE PROMOTER FOR DISTILLATION COLUMNS

The main task of the theta convergence promoter is to afford a better estimate of liquid and vapor molar fractions in each tray of the column. The assumptions implied by the promoter prove to be reliable for conventional columns, while they may cause numerical instability when dealing with nonconventional configurations. In these cases, corrected molar fractions may be computed only after making a supplementary assumption, which in principle is not unique. This study presents a new methodology which gives rather satisfactory results.