An approach for the optimal configuration and sequencing of complex batch-distillation processes is presented. The proposed method is based on formulating a mixed-logic dynamic optimization problem in which a performance index is minimized subject to a disjuncti®e dynamic model and constraints. The disjuncti®e model comprises a gi®en set of equipment modules, such as stacks of trays of different size or feed and product ®essels, a®ailable for the distillation process under consideration along with logical relationships pro®ided by the design context. The optimization based on this model may yield uncon®entional design and operational strategies, and thus impro®e the economic efficiency to a significant extent. The logic-based solution technique proposed in this work offers some fa®orable properties when compared to established mixed-integer dynamic optimization problem solution techniques reported in the literature. The design of a multistage batch-distillation process ser®es as an example to illustrate the proposed modeling and solution method.

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