527 / 2018-09-18 19:44:27

Production of valuable hydrocarbons by the pyrolysis of waste polymers: optimization in raw material/catalyst ratio

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The pyrolysis and gasification of waste streams is one possible way for their long term sustainable high value added utilization. Not only the environmental problem caused by the waste polymers, but also positive energy balance should be achieved by pyrolysis; e.g. waste polymers could be transformed into hydrocarbons with negative CO2 emission. However the parameters of the processes have a great influence to the product structure and their properties. Gases are the main products using high temperature process or the molecule structure can be in-situ modified by catalysts.
In this work the mixtures of real waste polymers were transformed into valuable hydrocarbons in a one-stage horizontal tubular reactor at 500, 700 and 900°C using different raw material/catalyst ratios. Products were analysed by GC-FID, GC-TCD, FTIR, HPLC methods. It was concluded, that the temperature has a great influence to the products yield: significant increasing in gaseous products and deposited coke (both in the thermal and thermo-catalytic reactor sections) yield was found. High temperature and presence of metal loaded synthetic zeolite catalyst can also supported the formation of syngas.