An Alternate MILP Model for Short-Term Scheduling of Batch Plants with Preordering Constraints

An alternate model is presented when preordering constraints are imposed in the short term scheduling of batch plants. The idea is to include the assumption of preordering of orders to units in the underlying representation for the model, as opposed to including preordering as a separate set of constraints. The resulting model not only is conceptually simple but also results in shorter solution times.