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Received April 3, 2001
Accepted September 10, 2001
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Study of Polystyrene Degradation Using Continuous Distribution Kinetics in a Bubbling Reactor
School of Civil and Environmental Engineering, Kunsan National University, Kunsan 573-701, Korea 1Department of Chemical Engineering, Korea University, Seoul 136-701, Korea 2Department of Chemical Engineering and Material Science, University of California, Davis, CA 95616, USA
wscha@kunsan.ac.kr
Korean Journal of Chemical Engineering, March 2002, 19(2), 239-245(7), 10.1007/BF02698408
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Abstract
A bubbling reactor for pyrolysis of a polystyrene melt stirred by bubbles of flowing nitrogen gas at atmospheric pressure permits uniform-temperature distribution. Sweep-gas experiments at temperatures 340-370 ℃ allowed pyrolysis products to be collected separately as reactor residue(solidified polystyrene melt), condensed vapor, and uncondensed gas products. Molecular-weight distributions (MWDs) were determined by gel permeation chromatography_x000D_
that indicated random and chain scission. The mathematical model accounts for the mass transfer of vaporized products from the polymer melt to gas bubbles. The driving force for mass transfer is the interphase difference of MWDs based on equilibrium at the vapor-liquid interface. The activation energy and pre-exponential of chain scission were determined to be 49 kcal/mol and 8.94×10(13) s(-1), respectively.
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References
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Mccoy BJ, Madras G, AIChE J., 43(3), 802 (1997)
Ng SH, Seoud H, Stanciulescu M, Sugimoto Y, Energy Fuels, 9(5), 735 (1995)
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Wang M, Smith JM, Mccoy BJ, AIChE J., 41(6), 1521 (1995)
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Westerhout RW, Balk RH, Meijer R, Kuipers JA, Vanswaaij WP, Ind. Eng. Chem. Res., 36(8), 3360 (1997)
