Abstract
Abstract This paper presents the use of different economic criteria during the generation of the Pareto optimal solutions within the multi-objective optimization of process flow sheets. It is shown that various economic criteria have a significant effect on the set of the Pareto solutions, which differ in the maximum values of the selected environmental criterion as well as in the ranges of their values. The reasons for variations are different stationary conditions of economic criteria. However, significant differences could be observed only if sufficiently accurate and precise process models were used, in which proper relations were established between the investment and the cash flow. In this case, the net present value would be the most appropriate economic measure for multi-objective optimization of process flow sheets.
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