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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 10, 2008
Accepted July 22, 2008

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Modeling and control of the melt index in HDPE process

A Ram Seong Eun Ho Lee Kyung Nam Lee Yeong Koo Yeo^†

Department of Chemical Engineering, Hanyang University, Seoul 133-791, Korea

Korean Journal of Chemical Engineering, January 2009, 26(1), 7-13(7), 10.1007/s11814-009-0002-4

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Abstract

We investigate the model for an industrial isothermal HDPE slurry reactor. The model, consisting of several nonlinear equations, can be linearized to give sets of linear time invariant state space model. The effectiveness of the linearized model is verified by the numerical simulations. A simple model predictive control scheme is constructed based on the linear state space model. The value of the melt index is obtained from the values of the manipulated and controlled variables generated from the control scheme. The control performance can be evaluated from the comparison between the computed melt index values and measured melt index values. The control scheme shows good tracking performance in the numerical simulations. We believe that the model developed in the present study can be effectively used to predict process variables as well as to control the melt index.

Keywords

Model Predictive Control HDPE Modeling and Simulation Melt Index Grade Change

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