Effect of Model Simplifications on the Optimal Solution of Batch Distillation Control Policy

This paper describes the effect of a number of commonly applied simplifications on the optimal performance of a batch still equipped with trays. A general rigorous model was formulated and verified by comparison with previous work. The model was then simplified using several commonly made assumptions. An optimal control policy was determined for each of the simplified models, and this controller was then used to drive the rigorous model. This was taken as analogous to a model-based optimization being implemented on a "real" plant. Comparisons are made regarding the appropriate degree of model simplification in models for use in on-line optimization.