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Conversion of HDPE into Value Products by Fast Pyrolysis Using FCC Spent Catalysts in a Fountain Confined Conical Spouted Bed Reactor
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Researchers studied the catalytic cracking of high-density polyethylene over spent FCC catalyst in a conical spouted bed reactor, finding that this process efficiently converts plastic waste into valuable fuel-range hydrocarbons.
Continuous catalytic cracking of polyethylene over a spent fluid catalytic cracking (FCC) catalyst was studied in a conical spouted bed reactor (CSBR) with fountain confiner and draft tube. The effect of temperature (475-600 °C) and space-time (7-45 gcat min gHDPE -1 ) on product distribution was analyzed. The CSBR allows operating with continuous plastic feed without defluidization problems and is especially suitable for catalytic pyrolysis with high catalyst efficiency. Thus, high catalyst activity was observed, with waxes yield being negligible above 550 °C. The main product fraction obtained in the catalytic cracking was made up of C5 -C11 hydrocarbons, with olefins being the main components. However, its yield decreased as temperature and residence time were increased, which was due to reactions involving cracking, hydrogen transfer, cyclization, and aromatization, leading to light hydrocarbons, paraffins, and aromatics. The proposed strategy is of great environmental relevance, as plastics are recycled using an industrial waste (spent FCC catalyst).
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Pyrolysis as a value added method for plastic waste management: A review on converting LDPE and HDPE waste into fuel
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This review examined pyrolysis as a method to convert low-density and high-density polyethylene plastic waste into fuel, summarizing process parameters, product yields, and fuel quality. Pyrolysis can transform otherwise unrecyclable plastic into diesel-like hydrocarbon fuels. The technology offers a potential solution for managing polyethylene waste while generating energy from materials that would otherwise persist in the environment.
Pyrolysis as a value added method for plastic waste management: A review on converting LDPE and HDPE waste into fuel
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This review focuses on pyrolysis as a method to convert waste LDPE and HDPE plastics into liquid fuel, summarizing reactor types, catalysts, and the factors influencing fuel yield and quality. While not about microplastics directly, it addresses the upstream problem of plastic waste accumulation — particularly the conversion of plastics that would otherwise persist in the environment and fragment into microplastics — into usable energy resources.
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This engineering paper describes the pyrolysis of plastic waste into fuel oil, evaluating process conditions and product yield. It is a waste-to-energy study relevant to plastic recycling but focused on industrial conversion rather than environmental microplastic contamination.
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