Pyrolysis of polypropylene for production of fuel‐range products: Effect of molecular weight of polypropylene

Abstract

Polypropylene (PP) with three different molecular weights (weight-average molecular weights of 12 000 (PP 12 ); 250 000 (PP 250 ); and 340 000 (PP 340 )) was pyrolyzed to investigate the effect of its molecular weight on the production of fuel-range chemicals. The pyrolytic gaseous products from the PP pyrolysis primarily consisted of non-condensable hydrocarbons such as methane, ethane, ethylene, propane, and propylene. The non-condensable hydrocarbon yields obtained with PP 250 and PP 340 were comparable at all tested pyrolysis temperatures (eg, 4.4 wt% at 800 C) and 20% higher than the yield obtained with PP 12 .An increase in the pyrolysis temperature resulted in non-condensable hydrocarbon yields for all three PP plastics. In addition, hydrocarbons with wider carbon number ranges (eg, gasoline-, jet fuel-, diesel-, and motor oil-range hydrocarbons) were produced in the pyrolysis of PP. The yields of the gasoline-, jet fuel-, and diesel-range hydrocarbons obtained from PP 250 and PP 340 were higher than those obtained from PP 12 at pyrolysis temperatures from 500 C to 800 C. The pyrolysis of PP 250 yielded 37.7 wt% gasoline-, 38.6 wt% jet fuel-, 45.1 wt% diesel-, and 11 wt% motor oil-range hydrocarbons. The results of this study can contribute to the development of plastic waste-to-energy methods.

Energy recovery from banner waste through catalytic pyrolysis over cobalt oxide: Effects of catalyst configuration

“…The yields of the pyrolytic liquid derived from the banner waste in the in situ and ex situ configurations were not noticeably different. For both configurations, the pyrolytic liquid yield decreased as the temperature rose, which was most likely due to the thermal degradation of condensable species enhanced by increasing temperature 38 . Figure 6 presents the yields of the condensable compounds produced in different catalyst configurations by varying temperature.…”

“…For both configurations, the pyrolytic liquid yield decreased as the temperature rose, which was most likely due to the thermal degradation of condensable species enhanced by increasing temperature. 38 Figure 6 presents the yields of the condensable compounds produced in different catalyst configurations by varying temperature. In comparison with the non-catalytic pyrolysis, the use of the Co 3 O 4 catalyst in the banner waste pyrolysis markedly increased the selectivities toward biphenyls and fluorenes in the pyrolytic liquid by up to 70.4% and 300%, respectively.…”

Single-Use Disposable Waste Upcycling via Thermochemical Conversion Pathway

“…No oxygenates were formed because the single-use food containers did not contain oxygen ( Table 2 ). Considering that the C 7 –C 32 hydrocarbons are in a range products including gasoline, jet fuel, diesel, and motor oil [ 44 ], pyrolysis has the potential to upcycle single-use food containers to make fuel-range chemicals. The difference between the selectivities toward the hydrocarbons obtained at different pyrolysis temperatures was not significant.…”

Flame Retardancy Properties and Rheological Behavior of PP/DiDOPO Conjugated Flame Retardant Composites

“…Polypropylene (PP) have widely been applied in electronic casings, building materials, automotive products, and furniture due to their desirable properties, such as cost-effective, ease processing, low density, and excellent mechanical properties ( Wu et al, 2020 ; Park and Lee, 2021 ). Unfortunately, because of PP has poor flame retardancy properties, when using in some fields that requires flame resistance is limited.…”