Optimal structure criteria for discrete,multistage processes

A general structure for discrete, multistage chemical processes is formulated so that a large class of possible process structures result from the variation of a finite set of structure variables. First-order criteria for stationary extrema with respect to these structure variables are derived. It is shown that the dimension of optimal structure problems can be reduced significantly.The authors would like to acknowledge and express their appreciation of the many cogent suggestions, discussion, and criticisms of Professor Roy Jackson, Rice University, Houston, Texas.