February 2002

Special Report: Clean Fuels

First-principles distillation inference models for product quality prediction

Modeling approach involves a short-cut simulation of a column section

Friedman, Y. Z., Petrocontrol; Neto, E. A., Porfirio, C. R., Petrobras

Advanced process control (APC) makes money by maximizing a key process variable (usually throughput) and pushing plant equipment to its limits. At the same time, product quality targets are maintained. This is critical. As Fig. 1 illustrates, pushing equipment to its limits without controlling product qualities forces the operator into a counter-productive giveaway operation.         Fig. 1. Why apply inferential control? Tools on the market can perform maximization, but quality contr

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