In structuring the optimum processing system using the cost objective, nonlinearities are introduced by investment- and labor-related costs. Alternative approaches to the linearization of the cost objective are considered in this paper and a combined approach is proposed which enables relatively simple and accurate cost optimizations, using the linear programming technique. The linearization procedure is based on a predefined investment strategy, and derived by combining two known methods (Rudd et al., Petrochemical Technology Assessment, Wiley, New York, 1981; Santiago et al., Computers chem. Engng 10, 421-431, 1986). The procedure is demonstrated by an example concerning a system for producing major petrochemicals from alternative raw materials. © 1992.
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