No abstract

In this work, a novel sequential approach for optimal conceptual design of extractive distillation columns for the separation of ternary azeotropic mixtures was developed. This approach is based on the design concepts of the method of infinitely sharp splits. Accordingly, a systematic and simple method for the determination of region of possible mode parameters in extractive section was established. This method also allows a fast and reliable determination of optimal mode parameters in extractive section for the minimum required vapor flow rate and for a specified number of trays in this section. These mode parameters are subsequently used in combination with material balance equations of the column and the tray-to-tray method for the calculation of optimal mode and design parameters in all column sections. It is shown that this design approach is rapid and robust and can readily be applied for the design and synthesis of energy-efficient extractive distillation units including vacuum extractive distillation columns and extractive distillation columns with a dividing wall.