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Gewählte Master / Diploma Thesis:

Leonora Bonell (2017): Thermogravimetric analysis and Kinetic study of marine plastic litter.
Master / Diploma Thesis - Institut für Verfahrens- und Energietechnik (IVET), BOKU-Universität für Bodenkultur, pp 73. UB BOKU obvsg FullText

Data Source: ZID Abstracts
Abstract:
Marine litter is not merely an aesthetic problem but an ecological and economical one, causing damage around the world. To solve a complex problem like this there are many approaches necessary and one of them is to build a pyrolysis reactor, which would transform the collected litter into high-energy products in gaseous, liquid and solid state. A pyrolysis requires, compared to other thermal processes, less technical effort and the end products can be stored or directly used. In order to design such a pyrolysis reactor it is required to know more facts about the feedstock especially the thermochemical behaviour and kinetic parameters. In the course of this research the found plastic particles where divided into following size-classes: “small microplastic” (<1mm), “large microplastic” (1-4mm) and “mesoplastic” (4-25mm). A thermogravimetric analysis (TGA) was carried out for the three different plastic sizes with a temperature program of 34-1000 ° C and heating rates of 5, 10, 15 and 20 K / min. The results obtained from the thermogravimetric analysis showed for all samples the same shape for the curve: single stage degradation in the temperature region 700 – 780K with most of the total weight loss (95%). The DTG curve revealed a single peak, which shifted with heating rate. The Arrhenius parameters, such as activation energy and pre-exponential factor, were obtained by model-free methods offered by KAS, Starink and FWO. The generated values for a size class differed slightly, respectively. All three selected size-classes of plastic showed in the average value a same trend: small microplastic had average activation energy between 320 – 325 kJ/mol, large microplastic between 329 – 334 kJ/mol and mesoplastic 338 – 344 kJ/mol. Based on these results, thus high temperatures and short residence time, a flash pyrolysis reactor would be suitable. The liquid products could be used for the ships engine and the gaseous product to compensate the required energy of the reactor.

Beurteilende(r): Pfeifer Christoph
1.Mitwirkender: Tondl Gregor

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