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Chemical Engineering Science 61 (2006) 33863399 www.elsevier.com/locate/ces

Summary: Chemical Engineering Science 61 (2006) 33863399
Estimator-based control of reactive distillation system:Application of an
extended Kalman filtering
Moshood J. Olanrewaju, Muhammad A. Al-Arfaj
Department of Chemical Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
Received 3 May 2005; received in revised form 28 October 2005; accepted 5 December 2005
Available online 3 February 2006
This paper demonstrates that a state estimator can be successfully designed and implemented in a feedback control system of reactive
distillation. The work of the state estimator is to provide the state compositions that are required to be used in the controller for necessary
action. The control performance of a system that relies on the state estimator is examined and compared to a system that takes direct
measurement from the process assuming the availability of a perfect online analyzer. It is found that the estimator-based system is robust against
a moderate measurement errors and erroneous initial conditions. If the state estimator is designed from a highly erroneous process model,
noisy measurements and approximate initial conditions, the use of estimator together with an online analyzer (for easily measured states) is
recommended to achieve an effective control of a reactive distillation system.
2006 Elsevier Ltd. All rights reserved.
Keywords: Reactive distillation; State estimator; Process control
1. Introduction
Estimator-based control application has received consider-


Source: Al-Arfaj, Muhammad A. - Department of Chemical Engineering, King Fahd University of Petroleum and Minerals


Collections: Engineering