Investigation of temperature effect on the separation of isobutyl alcohol and isobutyl acetate by the pressure swing distillation
Volume Title: 1
1Faculty of chemical engineering, Sahand University of Technology, Tabriz, Iran
2دانشکده مهندسی شیمی، دانشگاه صنعتی سهند
3Faculty of Chemical Engineering, Sahand University of Technology, Tabriz, Iran
Some binary azeotrope mixtures lose azeotropic behavior when the system pressure changes. Pressure swing distillation is a technique to separate azeotrope mixtures. In this study, the separation of a binary mixture of isobutyl alcohol (IBA) and isobutyl acetate (IBAc) was investigated by the PSD method. The commercial software Aspen HYSYS was used with the UNIQUAC thermodynamic model. The appropriate operating pressure for each column was selected at 101 kPa and 20 kPa, respectively. The distilled product of the low-pressure column as a recycle stream has been returned to the mixer. Eventually, the results showed that the purity of IBAc and IBA from the heavy stream of the high-pressure and low-pressure columns are 99.5% and 98.5%, respectively. To economic justification, reboiler heat duty was determined as an objective function. It was found that the reasonable purity for heavy streams of both columns are 80% and 91.5%.