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PID control schemes have been widely used in petroleum refinery and chemical processes. However, suitable tuning of PID parameters in order to maintain product quality and stability of reaction processes is required, especially, where in the polybutene reactor with exothermic reaction, the process dynamics change greatly due to the change of the catalyst activity, the product grade, and so on. Therefore, the operator has to determine the parameters as fairly conservative values taking thedoi:10.1252/kakoronbunshu.26.437 fatcat:ygt4o2qwkfel3dh7vv2r4swbnu