Journal
KOREAN JOURNAL OF CHEMICAL ENGINEERING
Volume 19, Issue 2, Pages 239-245Publisher
KOREAN INST CHEM ENGINEERS
DOI: 10.1007/BF02698408
Keywords
pyrolysis; molecular-weight-distribution; random scission; chain-end scission; continuous distribution theory
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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 340-370degreesC 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 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 X 10(13) s(-1), respectively.
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