Optimal Design of Azeotropic Batch Distillation

MUSATTI, MIGUEL; AGUIRRE, PÍO; ESPINOSA, JOSÉ; IRIBARREN, OSCAR

AICHE JOURNAL

John Wiley & Sons, Inc

Año: 2006 vol. 52 p. 968 - 985

0001-1541

This paper explores integrating models with different degrees of detail for optimizing azeotropic batch distillation systems. A detailed dynamic model is used from outside the optimization program to both verify feasibility of the design and update the parameters needed by the optimization model. The updated parameters are the constant relative volatilities between pseudo-components, used in a binary Fenske-Underwood-Gilliland type model. The approach was used to optimize the design of a batch process for the recovery of spent isopropyl alcohol, which works cyclically separating the excess water, satisfying an environmentally acceptable specification and using cyclohexane as entrainer, which in turn is recovered in the same process and recycled. The approach permitted optimizing the batch sizes, number of separation stages, the reflux ratios of a piecewise constant multilevel reflux policy, the extent of each separation and the size of the intermediate cuts to be recycled, with affordable computation and problem setup times.