Commenced in January 2007
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Kinetics of Polyethylene Terephthalate (PET)and Polystyrene (PS) Dynamic Pyrolysis

Authors: S.M. Al-Salem, P. Lettieri

Abstract:

Thermo-chemical treatment (TCT) such as pyrolysis is getting recognized as a valid route for (i) materials and valuable products and petrochemicals recovery; (ii) waste recycling; and (iii) elemental characterization. Pyrolysis is also receiving renewed attention for its operational, economical and environmental advantages. In this study, samples of polyethylene terephthalate (PET) and polystyrene (PS) were pyrolysed in a microthermobalance reactor (using a thermogravimetric-TGA setup). Both polymers were prepared and conditioned prior to experimentation. The main objective was to determine the kinetic parameters of the depolymerization reactions that occur within the thermal degradation process. Overall kinetic rate constants (ko) and activation energies (Eo) were determined using the general kinetics theory (GKT) method previously used by a number of authors. Fitted correlations were found and validated using the GKT, errors were within ± 5%. This study represents a fundamental step to pave the way towards the development of scaling relationship for the investigation of larger scale reactors relevant to industry.

Keywords: Kinetics, PET, PS, Pyrolysis, Recycling, Petrochemicals.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1332190

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References:


[1] A. Valavanidis, N. Iliopoulos, G. Gotsis, K. Fiotakis, 2008. "Persistent free radicals, heavy metals and PAHs generated in particulate soot emissions and residue ash from controlled combustion of common types of plastic". J Hazard Mater, 156(1-3); 277-284.
[2] APC, 2008. ÔÇÿAmerican Plastics Council, Facts and figures-. Arlington VA 22209, Technical paper.
[3] APM EU, 2008. ÔÇÿAssociation of Plastic Manufacturers in Europe, An analysis of plastics consumption in Europe-. Code: 2002 APME.
[4] Waste Watch, 2003. ÔÇÿPlastics in the UK economy: A guide to polymer use and the opportunities for recycling-. Final report of the Programme of sustainable use (UK); Waste Watch group.
[5] Clark, J.H., Hardy, J.J.E., 2004. ÔÇÿTowards sustainable chemical manufacturing: Polylactic acid - A sustainable polymer-, In: Azapagic, A., Perdon, S., and Clift, R. (eds), Sustainable development in practice: Case studies for engineers and scientists, Wiley 1st edition.
[6] PEU, 2008. ÔÇÿPlastics Europe, The compelling facts about plastics 2007: An analysis of plastics production, demand and recovery for 2007 in Europe-. Published by the Association of Plastics Manufactures (Plastics Europe), October.
[7] Smith, B. 2002. ÔÇÿPlastics recycling in the UK-. Final report, Valuplast.
[8] Ward, P., 2009. ÔÇÿPicking up plastic-. J Waste Resour Manage, CIWM June; 62-63.
[9] Parfitt, J., 2002. ÔÇÿAnalysis of household waste composition and factors driving waste increases-. Waste and Resources Action Programme (WRAP) for strategy unit, Government Cabinet Office, London, England (UK).
[10] Kaminsky, W., Schlesselmann, B., Simon, C., 1995. ÔÇÿOlefins from polyolefins and mixed plastics by pyrolysis-. J Anal App Pyrolysis, 32; 19-27.
[11] Andel, L., Kusy, J., Vales, J., Safarova, M., 2009. -Pyrolysis process of waste polyethyleneterephthalate-. Chem Prod Process Model, 4(1); 1-6.
[12] Ahrenfeldt J., 2007. ÔÇÿCharacterization of biomass producer gas as fuel for stationary gas engines in combined heat and power production-. PhD Thesis, Department of Chemical Engineering, Technical University of Denmark, Lyngby, Denemark.
[13] Mastral, J.F., Berrueco, C., Ceamanos, J., 2007. ÔÇÿTheoretical prediction of product distribution of the pyrolysis of high density polyethylene-. J Anal App Pyrolysis, 80(2); 427-438.
[14] Al-Salem, S.M., Lettieri, P., Baeyens, J., 2009. -Recycling and recovery routes of plastic solid waste (PSW): A review-, Waste Manage, 29(10): 2625-2643.
[15] Al-Salem, S.M., Lettieri, P., Baeyens, J., 2010. -Petrochemicals recovery through polyethylene (PE) pyrolysis: Maximizing product yields via isothermal and dynamic kinetics-, In: Proc Energy from Biomass and Waste UK Conference and Exhibition, London (England), UK, 26th-27th January.
[16] Al-Salem, S.M., Lettieri, P., Baeyens, J., 2009. -Thermal treatment of different grades and types of polyethylene (PE) wasted articles-. In: Proc 8th World Congress of Chemical Engineering, Montreal (Quebec), pp. 1- 4, Canada, 23rd-27th August.
[17] Al-Salem, S.M., Lettieri, P., Baeyens, J., (2009). -Thermal pyrolysis of High Density Polyethylene (HDPE)-. In: Proc 9th European Gasification Conference: Clean energy and chemicals, Organized by the Institute for Chemical Engineers (IChemE): Energy Conversion Subject Group, D├╝sseldorf, Germany, 23rd-25th March.
[18] Ray, R., Bhattacharya, P., Chowdhury, R., 2004. ÔÇÿSimulation and modelling of vegetable market wastes pyrolysis under progressive deactivation condition-. Can J Chem Eng, 82(3); 566-579.
[19] Al-Salem, S.M., Lettieri, P., Baeyens, J., 2010. -The valorization of plastic solid waste (PSW) by primary to quaternary routes: From re-use to energy and chemicals-. Prog Energy Combust Sci, 36(1): 103-129.
[20] Al-Salem, S.M., Lettieri, P., Baeyens, J., (2009). -Kinetics and product distribution of end of life tyres (ELTs) pyrolysis: A novel approach in polyisoprene and SBR thermal cracking-. J Hazard Mat, 172(2-3); 1690- 1694.
[21] Yang, J., Gupta, M., Roy, X., Roy, C., 2004. Study of tire particle mixing in a moving and stirred bed vacuum pyrolysis reactor, Can J Chem Eng, 82(3); 510-519.
[22] Oh, S.C., Jun, H.C., Kim, H.T., 2003. Thermogravimetric evaluation for pyrolysis kinetics of styrene-butadiene rubber, J Chem Eng Jpn, 36(8); 1016-1022.
[23] Coats, A.W., Redfern, J.P., 1964. Kinetic parameters from thermogravimetric data. Nature, 201(4914); 68-69.
[24] Martin-Gullon, I., Esperanza, M. and Font, R., 2001. Kinetic model for the pyrolysis and combustion of poly-(ethylene terephthalate) (PET). J Anal App Pyrolysis, 58-59; 635-650.
[25] Saha, B., Ghoshal, A.K., 2005. Thermal degradation kinetics of poly(ethylene terephthalate) from waste soft drinks bottles. Chem Eng J, 111(1); 39-43.
[26] Kim, S., Kim, S., 2004. Pyrolysis characteristics of polystyrene and polypropylene in a stirred batch reactor. Chem Eng J, 98(1-2); 53-60.
[27] Bouster, C., Vermande, P., Veron, J., 1980. Study of the pyrolysis of polystyrenes: I. Kinetics of thermal decomposition. J Anal App Pyrolysis, 1(4); 297-313.
[28] Martin-Gullon, I., Esperanza, M. and Font, R., 2001. Kinetic model for the pyrolysis and combustion of poly-(ethylene terephthalate) (PET). J Anal App Pyrolysis, 58-59; 635-650.
[29] R.K. Agrawal, 1992. Analysis of non-isothermal reaction kinetics. Part I: Simple reactions. Thermochim Acta, 203; 93-110.