(245c) A Shortcut Graphical and Spreadsheet Technique for Identifying Mass Exchange Networks

Cost-effective waste minimization within chemical processes continues to be a critical component for future sustainability of large chemical and polymer manufacturing companies.   Several methods have been developed for the synthesis of mass exchange networks (MENs) for waste minimization.  In fact, several of the methods previously developed are based on a two stage targeting approach.  The first stage uses the rich (waste) and lean (mass separating agents) composite curves to identify the maximum mass integration possible for an undesirable species to be transferred from a group of waste streams to a group of internal process streams that are used as mass separating agents.  Furthermore, the second stage identifies the network of mass exchange technologies that meets the target identified in stage one.  Several strategies have been employed for identifying the MEN in stage two including, but not limited to, mathematical optimization and state-space structural approaches. 

This paper will present a new graphical/spreadsheet technique and design strategy for identifying the MEN in stage two.  This technique allows the simultaneous evaluation of multiple diverse mass separation technologies.  Advantages of this strategy will be highlighted and several case studies will be discussed that illustrate the effectiveness of this approach.  Finally, experiences using this strategy in teaching undergraduate chemical engineering design courses will also be discussed.