A quasi-steady-state model for batch extractive distillation was provided.This shortcut model can be used to simulate the temperature of all trays in batch extractive distillation, the composition concentration of the still and the top of the distillation column.The experimental results were in good agreement with those from the model.The results proved that the model had such advantages as high precision and fast calculation.
Batch extractive distillation(BED)is a special method used in the distillation process by adding a solvent into the batch distillation column to alter the relative volatility of the components and improve the separation. A comprehensive design and simulation method is required due to the complexity of BED.In this study,a quasi-steady-state model for BED is proposed,the derivation and solution of the model are presented.This shortcut model can be used to simulate the composition and temperature of the reboiler,the top and other plates of the column in a batch extractive distillation operation.The calculated values are in good agreement with the experimental data.The results show that the quasi-steady-state model is a practical method because of some advantages such as high precision and fast calculation.
