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Dynamics and stability of ethylene polymerization in multizone circulating reactors

Multizone circulating bed reactors (MZCR) have the exclusive characteristics of producing polymers of different molecular weights in a single particle. Traditional fluidized bed reactors, on the other hand, can produce only one kind of molecular weight with relatively narrow distribution. A dynamic...

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Main Authors: Ghasem, N.M., Ang, W.L., Hussain, Mohd Azlan
Format: Article
Published: Korean Journal of Chemical Engineering 2009
Subjects:
TA Engineering (General). Civil engineering (General)
TP Chemical technology
Online Access:http://eprints.um.edu.my/7037/
http://www.scopus.com/inward/record.url?eid=2-s2.0-65949119336&partnerID=40&md5=d1148616799b630231912f10eb7f8f89
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spelling my.um.eprints.70372021-02-10T03:48:21Z http://eprints.um.edu.my/7037/ Dynamics and stability of ethylene polymerization in multizone circulating reactors Ghasem, N.M. Ang, W.L. Hussain, Mohd Azlan TA Engineering (General). Civil engineering (General) TP Chemical technology Multizone circulating bed reactors (MZCR) have the exclusive characteristics of producing polymers of different molecular weights in a single particle. Traditional fluidized bed reactors, on the other hand, can produce only one kind of molecular weight with relatively narrow distribution. A dynamic model for the MZCR is used to illustrate the basic dynamic behavior of the new reactor design used for polyethylene production. The model is used to study the copolymerization of ethylene with butene. Several parameter sensitivity analyses are performed to show the computer-simulated time responses for reactor temperature, number-average molecular weight, weight-average molecular weight, catalyst feed rate and the monomer/comonomer concentration along the reactor length. At certain operating conditions dynamic instability is observed and the results for the effect of cooling water temperature, catalyst feed rate, monomer and comonomer initial feed concentration on the reactor temperature and polymer molecular weight reveal that the system is very sensitive to disturbances in the heat exchanger coolant temperature. Also, at some operating conditions, the reactor temperature oscillates above the polymer melting temperature. Temperature runaway above polymer softening point is a serious problem which may cause polymer melting and hence reactor shutdown. The oscillatory behavior of the reactor temperature necessitates a suitable temperature control scheme to be installed. Korean Journal of Chemical Engineering 2009 Article PeerReviewed Ghasem, N.M. and Ang, W.L. and Hussain, Mohd Azlan (2009) Dynamics and stability of ethylene polymerization in multizone circulating reactors. Korean Journal of Chemical Engineering, 26 (3). pp. 603-611. ISSN 0256-1115 http://www.scopus.com/inward/record.url?eid=2-s2.0-65949119336&partnerID=40&md5=d1148616799b630231912f10eb7f8f89 DOI 10.1007/s11814-009-0102-1
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic TA Engineering (General). Civil engineering (General)
TP Chemical technology
spellingShingle TA Engineering (General). Civil engineering (General)
TP Chemical technology
Ghasem, N.M.
Ang, W.L.
Hussain, Mohd Azlan
Dynamics and stability of ethylene polymerization in multizone circulating reactors
description Multizone circulating bed reactors (MZCR) have the exclusive characteristics of producing polymers of different molecular weights in a single particle. Traditional fluidized bed reactors, on the other hand, can produce only one kind of molecular weight with relatively narrow distribution. A dynamic model for the MZCR is used to illustrate the basic dynamic behavior of the new reactor design used for polyethylene production. The model is used to study the copolymerization of ethylene with butene. Several parameter sensitivity analyses are performed to show the computer-simulated time responses for reactor temperature, number-average molecular weight, weight-average molecular weight, catalyst feed rate and the monomer/comonomer concentration along the reactor length. At certain operating conditions dynamic instability is observed and the results for the effect of cooling water temperature, catalyst feed rate, monomer and comonomer initial feed concentration on the reactor temperature and polymer molecular weight reveal that the system is very sensitive to disturbances in the heat exchanger coolant temperature. Also, at some operating conditions, the reactor temperature oscillates above the polymer melting temperature. Temperature runaway above polymer softening point is a serious problem which may cause polymer melting and hence reactor shutdown. The oscillatory behavior of the reactor temperature necessitates a suitable temperature control scheme to be installed.
format Article
author Ghasem, N.M.
Ang, W.L.
Hussain, Mohd Azlan
author_facet Ghasem, N.M.
Ang, W.L.
Hussain, Mohd Azlan
author_sort Ghasem, N.M.
title Dynamics and stability of ethylene polymerization in multizone circulating reactors
title_short Dynamics and stability of ethylene polymerization in multizone circulating reactors
title_full Dynamics and stability of ethylene polymerization in multizone circulating reactors
title_fullStr Dynamics and stability of ethylene polymerization in multizone circulating reactors
title_full_unstemmed Dynamics and stability of ethylene polymerization in multizone circulating reactors
title_sort dynamics and stability of ethylene polymerization in multizone circulating reactors
publisher Korean Journal of Chemical Engineering
publishDate 2009
url http://eprints.um.edu.my/7037/
http://www.scopus.com/inward/record.url?eid=2-s2.0-65949119336&partnerID=40&md5=d1148616799b630231912f10eb7f8f89
_version_ 1691733418831773696
score 13.211869

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