Retrofitting of mass exchange networks with temperature effects

Publisher Summary A systematic procedure for the retrofitting of mass-exchange networks (MENs) with temperature effects is developed. Alternative structural configurations of interest are examined, and both series and parallel structures are discussed. Two primary retrofitting strategies are employed: those restricted by no-capital constraints and those involving capital expenditure. The no-capital alternatives include enhancing the performance of current system and solvent substitution. The capital-based alternatives include the addition of new equipment. A new type of temperature-based mass-pinch retrofitting analysis is developed to maximize the utilization of existing capital while reconciling added capital with operating cost. The main concept in this novel pinch diagram is identifying maximum performance as dictated not only by thermodynamic limitations but also by physical­-size limitations. Different process alternatives are considered and screened to attain the optimum design.