Dynamic model for polyethylene production in a multizone circulating reactor

Ghasem, N.M. and Ang, W.L. and Hussain, M.A. (2008) Dynamic model for polyethylene production in a multizone circulating reactor. Chemical Product and Process Modeling, 3 (1). ISSN 19342659

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Abstract

The multizone circulating reactor (MZCR) technology is a newly announced reactor design for solid-catalyzed gas-phase polymerization. The process is characterized by two hydrodynamically distinct but interconnecting polymerization zones, thus forming a continuous loop of polymer flow between the said zones. In the present study, a dynamic model for the MZCR reactor is developed to illustrate the basic dynamic behavior of the new reactor design; 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 concentration along the reactor length.

Item Type: Article
Additional Information: Cited By (since 1996): 2 Export Date: 5 March 2013 Source: Scopus Art. No.: 1 Language of Original Document: English Correspondence Address: Ghasem, N. M.; United Arab Emirates UniversityUnited Arab Emirates; email: nayef@uaeu.ac.ae References: Basell. Spherizone Process and Services, Basell Poliolefine Italia, S. p. A., Milan, 2003Benham, E., McDaniel, M., (2003) Ethylene Polymers: HDPE in Encyclopedia of Polymer Science and Technology, , Wiley, New York; Choi, K.Y., Ray, W.H., The dynamic behavior of fluidized bed reactors for solid catalyzed gas phase olefin polymerization (1985) Chem. Eng. Sei, 40 (12), pp. 2261-2279; Covezzi, M., Mei, G.M., The multizone circulating reactor technology (2001) Chem. Eng. Sci, 56, pp. 4059-4067; Fernandes, F.A.N., Lona, L.M.F., Multizone circulating reactor modeling for gas-phase polymerization II: Reactor operating with gas barrier in the downer section (2004) J. Appl. Polym. Sci, 93, pp. 1053-1059; Fernandes, F.A.N., Lona, L.M.F., Multizone circulating reactor modeling for gas-phase polymerization I: Reactor modeling (2004) J. Appl. Polym. Sci, 93, pp. 1042-1052; Ghasem, N.M., Effect of polymer particle size and inlet gas temperature on industrial fluidized bed polyethylene reactors (1999) Chem. Eng. Tech, 22 (9), pp. 777-783; Govoni, G., Rinaldi, R., Covezzi, M., Galli, P., Process and apparatus for the gasphase polymerization of �-olefins, (1997), US Patent 5,698,642Hatzantonis, H., Yiannoulakis, H., Yiagopoulos, A., Kiparissides, C., Recent developments in modeling gas-phase catalyzed olefin polymerization fluidized-bed reactors: The effect of bubble size variation on the reactor's performance (2000) Chem. Eng. Sci, 55, pp. 3237-3259; Knuuttila, H., Lehtinen, A., Pakarinen, A.N., Advanced polyethylene technologies-control material properties (2004) Adv. Polym. Sci, 169, pp. 13-27; Kunii, D., Levenspiel, O., Circulating fluidized-bed reactors (1997) Chem. Eng. Sci, 52 (15), pp. 2471-2482; McAuley, K.B., MacGregor, J.F., Hamielec, A.E., A kinetic model for industrial gas-phase ethylene copolymerization (1990) AIChE J, 36 (6), pp. 837-850; Santos, J.L., Asua, J.M., de la Cal, J.C., Modeling of olefin gas phase polymerization in a multizone circulating reactor (2005) Ind. Eng. Chem. Res, 45 (9), pp. 3081-3094; Tobita, H., Hamielec, A.E., Kinetics of free-radical copolymerization: The pseudo-kinetic rate constant method (1991) Polymer, 32 (14), pp. 2641-2647
Uncontrolled Keywords: Fluidized bed; MZCR; Polyethylene; Polymerization; Butenes; Chemical reactors; Copolymerization; Ethylene; Fluidized beds; Multizone circulating reactor (MZCR); Polymer flow; Polyethylenes.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TP Chemical technology
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 10 Jul 2013 03:46
Last Modified: 10 Dec 2013 04:28
URI: http://eprints.um.edu.my/id/eprint/7043

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