Flowsheet optimization with implicit models and complex cost and size functions using Chemical Process Simulators

In this paper we address the synthesis and design of chemical processes using Chemical Modular Process Simulators – that include state of the art modelsincluding discontinuous cost and sizing equations. Equations are divided into ‘implicit’ ones which include all the equations in the process simulators with an input-output black box structure, and other third party equations (i.e. sizing and costing correlations for any database) and ‘explicit’ constraints in form of equalities or inequalities like in any regular equation based optimization environment.