Energy optimization in multi-component distillation through unit modification

In this study the available energy (exergy) method is used to analyze a usual distillation column from a thermodynamic point of view. The distillation unit consists of the column itself, the bottom reboiler and the top condenser, it is shown that, if an intermediate reboiler is introduced and its position specified, then the quantity of thermal energy to be supplied in order to achieve a designated separation, is reduced by approximately 10% which results due to optimizing the thermodynamic efficiency factor. The volume of the column is reduced by 13.5%, thus making this optimization more promising. The payback period of this modification is expected to be less than 12 months.