Maximizing light olefins and aromatics as high value base chemicals via single step catalytic conversion of plastic waste

Boron-Modified Mesoporous ZSM-5 for the Conversion of Pyrolysis Vapors from LDPE and Mixed Polyolefins: Maximizing the C2–C4 Olefin Yield with Minimal Carbon Footprint

“…Virgin LDPE Resin (ExxonMobil product LD150AC) and postconsumer MPO waste were received in a pellet form. The feeds were pulverized using a cutting and cryogenic mill, respectively, and a particle size fraction of <300 μm was used for the micropyrolysis tests to avoid mass and heat-transfer limitations . The MPO pellets stemmed from cold-washed sorted polyolefinic waste, with approximate compositions of 75 wt % PE, 16 wt % PP, and 9 wt % rest, whereby the rest roughly consists of 2% PA, 1% PET, 1% PS, and 5% nonpolymers .…”

“…The feeds were pulverized using a cutting and cryogenic mill, respectively, and a particle size fraction of <300 μm was used for the micropyrolysis tests to avoid mass and heat-transfer limitations . The MPO pellets stemmed from cold-washed sorted polyolefinic waste, with approximate compositions of 75 wt % PE, 16 wt % PP, and 9 wt % rest, whereby the rest roughly consists of 2% PA, 1% PET, 1% PS, and 5% nonpolymers . Based on its molecular formula, the high-purity virgin PE is composed of 85.7% C and 14.3% H, whereas the elemental compositions of MPO were determined to be 83.7 ± 0.22% C, 14.2 ± 0.12% H, 0.35 ± 0.03% N, and 1.71 ± 0.21% O on an inorganic-free basis .…”

“…29 The MPO pellets stemmed from cold-washed sorted polyolefinic waste, with approximate compositions of 75 wt % PE, 16 wt % PP, and 9 wt % rest, whereby the rest roughly consists of 2% PA, 1% PET, 1% PS, and 5% nonpolymers. 29 Based on its molecular formula, the high-purity virgin PE is composed of 85.7% C and 14.3% H, whereas the elemental compositions of MPO were determined to be 83.7 ± 0.22% C, 14.2 ± 0.12% H, 0.35 ± 0.03% N, and 1.71 ± 0.21% O on an inorganic-free basis. 29 While LDPE contained no fixed carbon and inorganics/ash, MPO was composed of 96.9% volatiles, 0.3 wt % fixed carbon, and 2.8 wt % ash.…”

“…29 Based on its molecular formula, the high-purity virgin PE is composed of 85.7% C and 14.3% H, whereas the elemental compositions of MPO were determined to be 83.7 ± 0.22% C, 14.2 ± 0.12% H, 0.35 ± 0.03% N, and 1.71 ± 0.21% O on an inorganic-free basis. 29 While LDPE contained no fixed carbon and inorganics/ash, MPO was composed of 96.9% volatiles, 0.3 wt % fixed carbon, and 2.8 wt % ash. 29 Catalyst Synthesis.…”

Opportunities and challenges for the application of post-consumer plastic waste pyrolysis oils as steam cracker feedstocks: To decontaminate or not to decontaminate?

“…Contaminants present in the original plastic waste distribute over the entire product range and are known to diminish the liquid product quality making further treatment necessary to obtain a high-quality petrochemical feedstock such as fossil naphtha ( Al-Salem et al, 2017 ). The total content of inorganics, or ash, in post-consumer mixed polyolefin (MPO) streams after sorting and washing (with cold water) can still be appreciable (2.8 wt%) ( Eschenbacher et al, 2022 ).…”