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THERMOGRAVIMETRIC STUDY OF MUNICIPAL WASTE PLASTICS CONSIDERING PERSPECTIVES OF WASTE PYRO-GASIFICATION
Abstract
Plastic is often one of the major components of municipal solid waste and its processing product Refuse Derived Fuel (RDF) and thus, waste plastic is an alternative energy resource of importance for implementing Waste-to-Energy strategy. The aim of this study is to investigate the thermal decomposition characteristics by means of thermogravimetric (TG) and derivative thermogravimetric (DTG) analysis of plastic commonly found in municipal solid waste from perspective of possibilities to use gasification as a processing tool. Thermogravimetric (TG) and derivative thermogravimetric (DTG) analysis of waste plastic demonstrates major differences in processes behind the thermal decomposition of the studied materials both in absence and presence of oxygen. However, it is possible to conclude that in the process of pyrolysis release of the majority of useful hydrocarbon compounds takes place within relatively narrow interval of temperatures 350 ? 500 ?C, while the bulk of problematic compounds (chlorine and fluorine) are released outside this interval: below it (in the case of chlorine) and above it (in the case of fluorine). In the case of oxidative decomposition, release of chlorine is overlapping with other processes; furthermore, precise control of temperature regime, in this case, seems to be nearly impossible due to much higher complexity of reaction mechanisms involved. Results also showed that formation of significant amounts of char takes place during pyrolytic decomposition of some of the analysed compounds (poly(ethylene terephthalate), poly(vinyl chloride) and rubbers) and this fact must be considered during the development of advanced thermal processing technologies.
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