Thermogravimetric analysis and kinetics of coal/plastic blends during co-pyrolysis in nitrogen atmosphere

Abstract Investigations into the co-pyrolytic behaviours of different plastics (high density polyethylene, low density polyethylene and polypropylene), low volatile coal and their blends with the addition of the plastic of 5 wt.% have been conducted using a thermogravimetric analyzer. The results indicated that plastic was decomposed in the temperature range 438–521 °C, while the thermal degradation temperature of coal was 174–710 °C. The overlapping degradation temperature interval between coal and plastic was favorable for hydrogen transfer from plastic to coal. The difference of weight loss (▵ W ) between experimental and theoretical ones, calculated as an algebraic sum of those from each separated component, was 2.0–2.7% at 550–650 °C. These experimental results indicated a synergistic effect during plastic and coal co-pyrolysis at the high temperature region. In addition, a kinetic analysis was performed to fit thermogavimetric data, the estimated kinetic parameters (activation energies and pre-exponential factors) for coal, plastic and their blends, were found to be in the range of 35.7–572.8 kJ/mol and 27–1.7 × 10 38  min − 1 , respectively.

[1]  E. Hippo,et al.  Co-conversion of coal/waste plastic mixtures under various pyrolysis and liquefaction conditions , 1995 .

[2]  Vicente L. Cebolla,et al.  Influence of reaction parameters on brown coal-polyolefinic plastic co-pyrolysis behavior , 2007 .

[3]  M. Diez,et al.  Effects of plastic wastes on coal pyrolysis behaviour and the structure of semicokes , 2005 .

[4]  Guohua Chen,et al.  Effect of inorganic matter on reactivity and kinetics of coal pyrolysis , 2004 .

[5]  Durlubh K. Sharma,et al.  Non-isothermal kinetic studies on co-processing of vacuum residue, plastics, coal and petrocrop , 2005 .

[6]  Gábor Várhegyi,et al.  Thermal decomposition of polypropylene in the presence of wood-derived materials , 2000 .

[7]  Enrico Biagini,et al.  Devolatilization rate of biomasses and coal–biomass blends: an experimental investigation , 2002 .

[8]  Hari B. Vuthaluru,et al.  Thermal behaviour of coal/biomass blends during co-pyrolysis , 2004 .

[9]  Manuel Garcia-Perez,et al.  Co-pyrolysis of sugarcane bagasse with petroleum residue. Part I: thermogravimetric analysis , 2001 .

[10]  H. Teng,et al.  Thermogravimetric analysis on global mass loss kinetics of rice hull pyrolysis , 1997 .

[11]  P. Straka,et al.  Kinetics of copyrolysis of coal with polyamide 6 , 2004 .

[12]  J. Weber,et al.  Co-pyrolysis of wood biomass and synthetic polymers mixtures. Part III: Characterisation of heavy products , 2003 .

[13]  Habib ur Rehman,et al.  Pyrolysis of some whole plastics and plastics–coal mixtures , 2006 .

[14]  J. Weber,et al.  Copyrolysis of wood biomass and synthetic polymers mixtures. Part II: characterisation of the liquid phases , 2002 .

[15]  Scott Renneckar,et al.  Compositional analysis of thermoplastic wood composites by TGA , 2004 .

[16]  Luis Puigjaner,et al.  Pyrolysis of blends of biomass with poor coals , 1996 .

[17]  Kartic C. Khilar,et al.  Pyrolysis characteristics of biomass and biomass components. , 1996 .

[18]  R. Lin,et al.  Catalytic hydrogenation of coals in the absence of solvent: 1. Compositional changes of an hvA bituminous coal by chemical analysis and reflected fluorescent light microscopy , 1986 .