Microwave-assisted pyrolysis of polypropylene plastic for liquid oil production
JOURNAL OF CLEANER PRODUCTION(2023)
Abstract
Polypropylene (PP) is one of the most common polymers used in various plastic materials, and its degradation plays a significant role in sustainable environmental development. The objective of this study was to enhance the yield and quality of liquid oil derived from polypropylene plastics through microwave-assisted pyrolysis. The effects of pyrolysis temperature, microwave power, and PP loading on oil products were experimentally analyzed. The results revealed that increasing the pyrolysis temperature from 350 degrees C to 550 degrees C led to a rise in the yield of liquid oil from 0.027 to 0.793 g/g and then decreased to 0.657 g/g. With the increase in microwave power from 400 W to 800 W, the oil yield increased from 0.65 to 0.793 g/g and then dropped to 0.22 g/g. Furthermore, increasing the amount of PP from 20 g to 40 g resulted in an increase in oil yield from 0.345 to 0.793 g/g and then decreased to 0.713 g/g. An optimal oil yield was 0.793 g/g when the microwave power, pyrolysis temperature, and PP loading were 500 W, 450 degrees C, and 30 g respectively, and the oil was rich in cyclanes, alkenes and alkanes (about 97-99.6 area%). Additionally, the liquid oil primarily ranged from C8 to C15 (90.1 area%), indicating that microwave-assisted pyrolysis of polypropylene plastics raises the selectivity of small molecular products.
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Key words
Pyrolysis,Polypropylene,Microwave-assisted,Oil yield
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