| Abstract
| - A method for setting performance targets for a chemical process, based on mass, energy, and entropy, ispresented. These targets can be determined in the early stages of the design process to aid in the synthesis ofa suitable flowsheet. These targets are “global” targets, because the overall process is considered and doesnot consider the individual processing units. A method of determining the minimum amount of inputs (mass,energy, and work) is illustrated by setting various targets (for example, no CO2 emissions, no energy emittedfrom the process, or ΔH = 0 and ΔG = 0). The approach allows one to screen the various options easilyand thus determine processes that are efficient and environmentally friendly. This approach also allowsopportunities of mass, heat, and work integration to be determined and applied at the earliest stages of thedesign process. Initially, a graphical solution is illustrated, and thereafter, the approach is generalized usinga linear programming formulation. The approach is demonstrated by identifying opportunities in a methanolproduction plant.
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