NDLI: Control of molecular weight distribution of polyethylene in gas-phase fluidized bed reactors

Content Provider	Springer Nature Link
Author	Ali, Mohammad Al haj Ajbar, Emadadeen Ali AbdelHamid Alhumaizi, Khalid
Copyright Year	2009
Abstract	This paper presents a feasibility study of the broadening of polyethylene molecular weight distribution produced using a multisite Ziegler-Natta catalyst in a fluidized-bed reactor. A nonlinear model predictive control algorithm, applied to a validated model of the reactor, is used for the on-line control of the entire molecular weight distribution of the produced polymer. Control of a target chain-length distribution is achieved by selecting a collection of points in the distribution and using them as set points for the control algorithm. An on-line Kalman filter is used to incorporate infrequent and delayed off-line molecular weight measurements. Through simulation the control algorithm is evaluated, under tracking conditions as well as plant-model mismatch. The results demonstrate that the control algorithm can regulate the entire molecular weight distribution with minimum steady state error. However, the efficiency of this approach is highly dependent on the dynamics of hydrogen inside the reactor.
Starting Page	364
Ending Page	372
Page Count	9
File Format	PDF
ISSN	02561115
Journal	Korean Journal of Chemical Engineering
Volume Number	27
Issue Number	1
e-ISSN	19757220
Language	English
Publisher	Springer US
Publisher Date	2010-02-16
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Molecular Weight Distribution Nonlinear Model Predictive Control Polymerization Reactor Control Polyethylene Fluidized-bed Reactor Biotechnology Materials Science Catalysis Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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