Abstracts 213 family of such problems is referred to as Model poj"t'" Problems (l!APP); these deal with the selection of effecuve sets of inputs and cutputs cut of huger potentialsets. The .smt of this pqer is to &ssify the different types of MPPs. dtsqss thm relevance in the early process design sta 't for th& study and suggest essential too es, provide I fmFwo& and methodologtes for their qhtticm. lbe suggested SohrtimtS aim at pNdUcing fmal models with inherently "good" cCslcrO1 StNUUre di8NcteriStiLU. 158 Optbnai Daalgu and Operrtion of Complex Batch Distiii8tion Coiumn s. Ha&e, B.B. Abdui A&, I. Hlshimoto, T. WUn8be pp 177-m A new type of batch distillatimr cohmm. a "complex batch distillation &mm", is roposed, and its characteristics am studied. The complex cop umn is ccnvaiient for removing light atid heavy impurities from the raw materials simultaneotlsly~ In this reseamh,~the complex column is regarded as a aunbmed system of o&nary and stripping batch distillatton columns where the condenser of the stripping column is heat-integrated with the rebciler of the oniinmy column. The differences between ordinary and stripping cohlmns are clarified analytically. using 159 Dynamk Modeiing in Design aanN% Safety Checking dL8rge Scaie Pi