Catalytic pyrolysis of petroleum-based and biodegradable plastic waste to obtain high-value chemicals
| Autor: | Benjamas Cheirsilp, Neeranuch Phusunti, Worasak Phetwarotai, Koranit Saeaung, Suttichai Assabumrungrat |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
020209 energy 02 engineering and technology Biodegradable Plastics 010501 environmental sciences 01 natural sciences Catalysis chemistry.chemical_compound 0202 electrical engineering electronic engineering information engineering Recycling Waste Management and Disposal 0105 earth and related environmental sciences Wax Lactide Polyethylene Low-density polyethylene Petroleum Chemical engineering chemistry visual_art visual_art.visual_art_medium High-density polyethylene Biodegradable plastic Pyrolysis Plastics |
| Zdroj: | Waste management (New York, N.Y.). 127 |
| ISSN: | 1879-2456 |
| Popis: | The petroleum-based plastics, high-density polyethylene (HDPE), low-density polyethylene (LDPE), and polypropylene (PP), and the biodegradable plastic, polylactide (PLA) were processed by thermal and catalytic pyrolysis to investigate their suitability as feedstock for chemical recycling. The influence of pyrolysis temperature (400–600 °C) and catalyst (zeolite, spent FCC, and MgO catalyst) on the pyrolysis liquid composition and yield was studied. The studied petroleum-based plastics had similar decomposition temperature ranges but produced their highest pyrolysis yields at different temperatures. Pyrolysis liquids from thermal degradation of HDPE and LDPE consisted high yield of waxes but those of PP and PLA consisted of both waxes and liquid oil. Catalysts affected not only the pyrolysis yield, but also the proportions of liquid oil and wax in pyrolysis liquids. Alkenes, alkanes, and aromatics were the main compounds in the pyrolysis liquids. Spent FCC catalyst reduced the production of waxes and increased the production of gasoline-range hydrocarbons and aromatics. MgO catalyst led to high coke formation from polyolefins and PLA. Lactic acid, lactide and propanoic acid were examples of valuable chemicals recovered from the pyrolysis of PLA. Lactide was the main product (up to 79%) of catalytic pyrolysis with zeolite at 400 °C. Spent FCC catalyst produced mostly propanoic acid at 400 °C but at 600 °C, L-lactic acid became the most abundant compound. |
| Databáze: | OpenAIRE |
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