A hybrid heat integration scheme for bioethanol separation through pressure-swing distillation route

Optimization of Pressure-Swing Distillation for Anhydrous Ethanol Purification by the Simulated Annealing Algorithm

“…Although the ethanol-water azeotrope does not have high sensitivity to pressure change, several studies show that it is possible to carry out the dehydration using the pressure-swing distillation scheme (Kiran and Jana, 2015). As shown in Figure 2, the azeotropic composition of ethanol-water changes from 87.2% mol of ethanol at 1.0atm to 79.4% mol% of ethanol at 10atm (the results shown in this figure were calculated using the thermodynamic model described in the Vapor-liquid equilibrium section).…”

“…As a result, it is necessary to dehydrate the ethanol in the last step of its production process via a biological route, which is still the most widely used process. This, however, is not an easy separation technique due to the formation of a homogeneous minimum boiling point azeotrope formed between water and ethanol (Kiran and Jana, 2015) .…”

Separation of acetonitrile/methanol/benzene ternary azeotrope via triple column pressure-swing distillation

“…Pressure-swing distillation (PSD) [14][15][16][17][18][19][20][21][22] avoids the potential problem of introducing the third component and has gained lots of attention from researchers in recent years, by comparison with special distillation such as extractive distillation (ED) [23][24][25][26][27][28], azeotropic distillation [29][30][31][32], and reactive distillation [33][34][35]. Munoz [36] studied ED and PSD process for isobutyl alcohol/isobutyl acetate separation using the commercial simulator Aspen HYSYS while Lladosa et al [37] investigated the separation of din-propyl ether and n-propyl alcohol and found that PSD was more attractive than ED using an entrainer.…”

Control of Extractive Distillation and Partially Heat-Integrated Pressure-Swing Distillation for Separating Azeotropic Mixture of Ethanol and Tetrahydrofuran

“…31−34 A means of energy saving of the PSD process by combining the condenser of the highpressure column (HPC) with the reboiler of the low-pressure column (LPC) make this distillation process more competitive than conventional distillation. 35,36 The dynamic control published in the open literature includes the control structures for the PSD with no, partial, and full heat integration. 37−39 For example, Luyben 37 presented some dynamic control structures for PSD with different heat integration in the separation of THF and water mixture.…”