Pyrolysis characteristics of polystyrene and polypropylene in a stirred batch reactor

Abstract Kinetic tests on pyrolysis of polystyrene (PS) and polypropylene (PP) were carried out with a thermogravimetric analysis (TGA) technique at the heating rate of 0.5, 1.0, and 2.0 °C min −1 in a stirred batch reactor. The polystyrene was mainly decomposed between 370 and 410 °C at the heating rates, whereas the polypropylene between 400 and 460 °C. The apparent energy of activation and the apparent order of reaction were determined at conversions from 1 to 100%. The ranges of apparent energies of activation of polystyrene were from 164 to 249 kJ mol −1 at conversions in the range of 1–100% and the apparent order of reaction was 0.32. The apparent energies of activation of polypropylene increased slowly from 208 to 288 kJ mol −1 and the apparent order of reaction was 0.01. The effects of heating rate on the product distribution have been studied. The selectivity of hydrocarbons corresponding to the styrene monomer and dimer was very high for the pyrolysis of polystyrene. The selectivity of specific hydrocarbons, however, was not observed for the case of polypropylene.

[1]  H. Bockhorn,et al.  Stepwise pyrolysis for raw material recovery from plastic waste , 1998 .

[2]  M. T. Martínez,et al.  Thermal cracking of coal residues: Kinetics of asphaltene decomposition , 1997 .

[3]  Eli S. Freeman,et al.  The Application of Thermoanalytical Techniques to Reaction Kinetics: The Thermogravimetric Evaluation of the Kinetics of the Decomposition of Calcium Oxalate Monohydrate , 1958 .

[4]  Andreas Hornung,et al.  Kinetic study on the thermal degradation of polypropylene and polyethylene , 1999 .

[5]  S. H. Kim,et al.  Non-isothermal pyrolysis of waste automobile lubricating oil in a stirred batch reactor , 2003 .

[6]  T. Ozawa,et al.  Critical investigation of methods for kinetic analysis of thermoanalytical data , 1975 .

[7]  W. Kaminsky,et al.  Pyrolysis of mixed plastics into aromatics , 1999 .

[8]  Akbar A. Merchant,et al.  Pyrolysis of scrap tires and conversion of chars to activated carbon , 1993 .

[9]  Tiziano Faravelli,et al.  Thermal degradation of polystyrene , 2001 .

[10]  P. Carniti,et al.  POLYSTYRENE THERMODEGRADATION .2. KINETICS OF FORMATION OF VOLATILE PRODUCTS , 1991 .

[11]  J. Smith,et al.  Molecular Weight Effect on the Dynamics of Polystyrene Degradation , 1997 .

[12]  H. E. Kissinger.  Reaction Kinetics in Differential Thermal Analysis , 1957 .

[13]  T. Ishii,et al.  Mechanism of high-pressure hydrogenolysis of Hokkaido coals (Japan). 1. Simulation of product distributions , 1976 .

[14]  Yasunobu Saito,et al.  Solvent effect on thermal degradation of polystyrene , 1990 .

[15]  Yoshikazu Sugimoto,et al.  Conversion of Polyethylene to Transportation Fuels through Pyrolysis and Catalytic Cracking , 1994 .

[16]  S. H. Kim,et al.  Pyrolysis kinetics of waste automobile lubricating oil , 2000 .

[17]  T. Ozawa.  A New Method of Analyzing Thermogravimetric Data , 1965 .

[18]  S. Balke,et al.  The thermal degradation kinetics of polypropylene: Part II. Time-temperature superposition , 1997 .

[19]  F. Chang,et al.  Pyrolysis Kinetics of Acid-Leached Rice Husk , 1997 .

[20]  C. Blasi.  Linear pyrolysis of cellulosic and plastic waste , 1997 .

[21]  B. Z. Uysal,et al.  Non-isothermal pyrolysis kinetics of three Turkish oil shales , 1996 .

[22]  M. Yüksel,et al.  Evolution of volatile products from Göynük (Turkey) oil shales by temperature-programmed pyrolysis , 1997 .

[23]  Andreas Hornung,et al.  Environmental engineering: Stepwise pyrolysis of plastic waste , 1999 .

[24]  S. Balke,et al.  The thermal degradation kinetics of polypropylene : Part III. Thermogravimetric analyses , 1997 .

[25]  J. M. Bouvier,et al.  Gas-solid pyrolysis of tire wastes: kinetics and material balances of batch pyrolysis of used tires , 1987 .

[26]  W. Kaminsky,et al.  Pyrolysis of mixed polyolefins in a fluidised-bed reactor and on a pyro-GC/MS to yield aliphatic waxes , 2000 .