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Chemical Recovery from Polystyrene Waste and Low Density Polyethylene Via Conventional Pyrolysis
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This study applied conventional pyrolysis to recover chemical products from polystyrene waste and low-density polyethylene from Turkey's plastic waste stream. Researchers characterized pyrolysis products to evaluate chemical recovery as a recycling route for these common thermoplastics.
In Turkey, plastic wastes have formed 5-14 % of total solid wastes. Plastic wastes have been classified as thermoplastic and thermosets. Thermoplastic wastes which covers Polyethylene (PE), Polystyrene (PS), Polypropylene (PP), Polyethylene terephthalate (PET) and Polyvinyl chloride (PVC) can be recycled by using mechanical recycling, energy recovery and chemical recovery routes. Pyrolysis as a chemical recovery technique is important to produce invaluable chemicals in high yields. In this study, it was aimed to obtain hydrocarbons from PS and Low density Polyethylene (LDPE) via pyrolysis. Product yields were calculated and liquid products were analyzed via GC-MS. In the light of the results, it was deduced that 520 ⁰C and 570 ⁰C were the suitable temperatures to obtain the liquid product with maximum yields for LDPE and PS respectively. That temperature was found for LDPE and PS co-pyrolysis as 570 ⁰C. It was determined that Benzene-Toluene-Ethyl Benzene (BTE) fraction amount increased from 5 % to 30 % with LDPE adding in the feed for almost same liquid product yields of PS (88%) and LDPE/PS (84 %). In addition, it was obtained the pyrolytic liquid which comprised of wholly alkanes and alkenes for LDPE with 70 % product yield.
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Scientists collected and analyzed 23 random plastic packaging waste samples from food and non-food products in Greece, identifying polyethylene, PET, polypropylene, and polystyrene as the most common polymers. Using pyrolysis, they broke these plastics down into valuable chemical products including monomers like styrene and ethylene. The research demonstrates that better characterization and recycling of packaging waste could recover useful materials and help reduce the roughly 62% of plastic packaging that currently goes unrecycled in Europe.
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This review surveys mechanical, chemical, and energy recovery methods for plastic waste recycling, examining challenges such as polymer degradation across cycles, the role of fillers, and advanced chemical techniques like pyrolysis and gasification. It provides practical guidance on the current state and future directions of plastic recycling across major polymer types including PET, HDPE, PP, and PS.
Catalytic Pyrolysis Process to Produce Styrene from Waste Expanded Polystyrene Using a Semi-Batch Rotary Reactor
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Researchers optimized catalytic pyrolysis of waste expanded polystyrene to maximize recovery of styrene monomer, which can be reused in polystyrene production. Using metal oxide catalysts, they achieved high styrene yields at relatively low temperatures compared to standard thermal pyrolysis. This chemical recycling approach could help reduce polystyrene waste from reaching the environment where it eventually fragments into microplastics.
Exploration of Pyrolysis Behaviors of Waste Plastics (Polypropylene Plastic/Polyethylene Plastic/Polystyrene Plastic): Macro-Thermal Kinetics and Micro-Pyrolysis Mechanism
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Researchers investigated the pyrolysis behavior of three common plastics — polyethylene, polypropylene, and polystyrene — using both experimental analysis and molecular dynamics simulations. The study determined activation energies and decomposition mechanisms for each plastic type, finding that polystyrene had the lowest thermal stability, which informs strategies for plastic waste recycling through pyrolysis.
Optimisation of Process Parameters to Maximise the Oil Yield from Pyrolysis of Mixed Waste Plastics
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Researchers optimized the process parameters for thermal pyrolysis of mixed waste plastics to maximize oil yield from HDPE, polypropylene, and polystyrene. The study used response surface methodology to identify ideal conditions for converting plastic waste into pyrolytic oil, supporting chemical recycling as a strategy to reduce plastic pollution.
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