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Thermal pyrolysis of LDPE/PP multilayer and metalized BOPP plastic packaging to optimize oil/wax yield for use as a fuel source
Thesis (MEng)--Stellenbosch University, 2022.
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| Format: | Thesis |
| Language: | en_ZA |
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Stellenbosch : Stellenbosch University
2022
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| _version_ | 1867614004856225792 |
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| access_status_str | Open Access |
| author | Madyibi, Salizwa Siliziwe |
| author2 | Görgens, Johann Ferdinand |
| author_browse | Görgens, Johann Ferdinand Madyibi, Salizwa Siliziwe |
| author_facet | Görgens, Johann Ferdinand Madyibi, Salizwa Siliziwe |
| author_sort | Madyibi, Salizwa Siliziwe |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MEng)--Stellenbosch University, 2022. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/124876 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA |
| last_indexed | 2026-06-10T12:45:08.467Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/124876 Thermal pyrolysis of LDPE/PP multilayer and metalized BOPP plastic packaging to optimize oil/wax yield for use as a fuel source Madyibi, Salizwa Siliziwe Görgens, Johann Ferdinand Stellenbosch University. Faculty of Engineering. Dept. of Process Engineering. Thermal pyrolysis Multilayer plastics Metallizing Petroleum as fuel UCTD Thesis (MEng)--Stellenbosch University, 2022. ENGLISH SUMMARY: The pollution caused by plastic waste does not only pose a threat to the environment but leads to the loss of valuable hydrocarbon-based materials. The growing volumes of plastic waste in South African landfills and lack of recycling initiatives multilayer and flexible plastic packaging, leads to the consideration of alterative recycling methods apart from primary and secondary recycling. Pyrolysis has been identified as a promising technology to curb waste plastics that are regarded as “non-recyclable” because of their complex composition caused by the presence of multiple material within the plastics. Various plastic materials have been pyrolyzed with the focus on single layer plastics or manually mixed plastic types in co-pyrolysis with limited report on the pyrolysis of multilayer and metalized flexible plastics. Also, the transition from bench scale to pilot scale has not been investigated for these plastics which could result in complications for the pyrolysis process if the process was considered for production of oil/wax at a commercial level. The aim of the study was to convert two waste packaging plastic types through pyrolysis into oil/wax product for fuel applications through determining the suitability of the plastics as a feedstock using characterization. An optimisation of the oil/wax yield and quality was performed in a semi-batch induction reactor at bench scale and the results were used in a semi-continuous rotary kiln reactor to scale-up the process to a pilot scale. The characterization showed that the plastics were suitable for use as a fuel because a high carbon and hydrogen content >99wt%, a volatile matter >97wt%, and heating rates between 42-45MJ/kg, implying the production of a commercially comparable fuel. A maximum oil/wax yield of 73% was obtained in the pyrolysis of LDPE/PP multilayer and 77% for met BOPP during bench scale tests at 450℃ with an HHV of 42.49MJ/kg and 45.55MJ/kg, respectively. The scale up process resulted in a lower oil/wax yield for both plastics with a maximum yield of 49% obtained for LDPE/PP at 550℃ and 46% obtained for met BOPP at 500℃ having an HHV of 44.24MJ/kg and 43.77MJ/kg, respectively. The temperature at which the maximum oil/wax yield was obtained shifted to higher temperatures with a significant decrease in the oil/wax yields for both plastics. A comparison of oil/wax yield at 460℃ for pure PP and met BOPP pellets showed no significant difference. However, the fuel characterisation showed that the oil/wax for LDPE/PP and met BOPP had similar qualities to diesel which would need further upgrading for use as a commercial fuel. "Geen opsomming beskikbaar" Masters 2022-03-11T07:27:21Z 2022-04-29T09:38:48Z 2022-03-11T07:27:21Z 2022-04-29T09:38:48Z 2022-04 Thesis http://hdl.handle.net/10019.1/124876 en_ZA Stellenbosch University xi, 116 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Thermal pyrolysis Multilayer plastics Metallizing Petroleum as fuel UCTD Madyibi, Salizwa Siliziwe Thermal pyrolysis of LDPE/PP multilayer and metalized BOPP plastic packaging to optimize oil/wax yield for use as a fuel source |
| title | Thermal pyrolysis of LDPE/PP multilayer and metalized BOPP plastic packaging to optimize oil/wax yield for use as a fuel source |
| title_full | Thermal pyrolysis of LDPE/PP multilayer and metalized BOPP plastic packaging to optimize oil/wax yield for use as a fuel source |
| title_fullStr | Thermal pyrolysis of LDPE/PP multilayer and metalized BOPP plastic packaging to optimize oil/wax yield for use as a fuel source |
| title_full_unstemmed | Thermal pyrolysis of LDPE/PP multilayer and metalized BOPP plastic packaging to optimize oil/wax yield for use as a fuel source |
| title_short | Thermal pyrolysis of LDPE/PP multilayer and metalized BOPP plastic packaging to optimize oil/wax yield for use as a fuel source |
| title_sort | thermal pyrolysis of ldpe pp multilayer and metalized bopp plastic packaging to optimize oil wax yield for use as a fuel source |
| topic | Thermal pyrolysis Multilayer plastics Metallizing Petroleum as fuel UCTD |
| url | http://hdl.handle.net/10019.1/124876 |
| work_keys_str_mv | AT madyibisalizwasiliziwe thermalpyrolysisofldpeppmultilayerandmetalizedboppplasticpackagingtooptimizeoilwaxyieldforuseasafuelsource |