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Title:Recikliranje plastičnih polikarbonatnih odpadkov s hidrotermičnimi postopki : magistrsko delo
Authors:ID Kogovšek, Kristjan (Author)
ID Škerget, Mojca (Mentor) More about this mentor... New window
ID Čolnik, Maja (Comentor)
Files:.pdf MAG_Kogovsek_Kristjan_2026.pdf (3,52 MB)
MD5: 338C11F6BE28D0AB8C158E60719F5D55
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:Naraščajoče količine plastičnih odpadkov in omejitve mehanskega recikliranja poudarjajo potrebo po razvoju učinkovitih metod kemijskega recikliranja. V magistrskem delu smo preučevali hidrotermično razgradnjo odpadnih polikarbonatnih zgoščenk (CD-jev) v pod- in nadkritični vodi z namenom ovrednotenja vpliva temperature in reakcijskega časa na stopnjo razgradnje ter porazdelitev in sestavo produktov. Eksperimenti so potekali v temperaturnem območju od 250 do 450 °C in reakcijskih časih od 5 do 60 min. Produkte smo analizirali s termogravimetrično analizo (TGA), infrardečo spektroskopijo (FTIR), plinsko kromatografijo (GC-FID) ter analizirali celokupni ogljik (TC) v vodni fazi. Rezultati so pokazali, da je temperatura ključni parameter procesa: pri 250 °C je ostalo 77,0 % nedegradiranega materiala, pri 300 °C je že prišlo do izrazite razgradnje, medtem ko je bil pri temperaturah 400 in 450 °C dosežen tudi do 96,9 % izkoristek organske faze. Največji delež bisfenola A (28,5 %) je bil dosežen pri 250 °C in 60 min, medtem ko sta se pri višjih temperaturah povečevala deleža fenola (do 36,7 %) in 4-izopropilfenola (do 20,8 %), ob hkratnem povečanju deleža plinske faze do 9,0 %. Ugotovitve potrjujejo, da je s prilagajanjem procesnih pogojev mogoče usmerjati selektivnost reakcije, pri čemer hidrotermična obdelava predstavlja učinkovito in perspektivno metodo kemičnega recikliranja polikarbonatnih odpadkov v okviru trajnostnih pristopov krožnega gospodarstva.
Keywords:polikarbonat, hidrotermična razgradnja, nadkritična voda, plastični odpadki, bisfenol A
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[K. Kogovšek]
Year of publishing:2026
Number of pages:1 spletni vir (1 datoteka PDF (X, 51 str.))
PID:20.500.12556/DKUM-97393 New window
UDC:[66.092:54-139]: 547.56(043.2)
COBISS.SI-ID:277155587 New window
Publication date in DKUM:04.05.2026
Views:231
Downloads:6
Metadata:XML DC-XML DC-RDF
Categories:KTFMB - FKKT
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Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:03.03.2026

Secondary language

Language:English
Title:Recycling of policarbonate plastics waste using hydrothermal
Abstract:The increasing volume of plastic waste and the limitations of mechanical recycling underscore the need to develop effective chemical recycling methods. In this master's thesis, the hydrothermal degradation of waste polycarbonate compact discs (CDs) in subcritical and supercritical water was investigated, aiming to evaluate the influence of temperature and reaction time on the degree of degradation and product distribution. Experiments were conducted at temperatures ranging from 250 to 450 °C and reaction times from 5 to 60 minutes. The products were analysed by thermogravimetric analysis (TGA), infrared spectroscopy (FTIR), gas chromatography (GC-FID), and analysis of total carbon (TC) content. The results showed that temperature is a key parameter in the process: at 250 °C, 77.0% of the solid phase remained undegraded, while at 300 °C the degree of degradation increased significantly, and at 400 and 450 °C up to 96.9% of the organic phase was recovered. The highest proportion of bisphenol A (28.5%) was achieved at 250 °C and 60 minutes, while at higher temperatures the proportions of phenol (up to 36.7%) and 4-isopropylphenol (up to 20.8%) increased, with a simultaneous increase in the gas phase to 9.0%. These findings confirm that the selectivity of the reaction can be controlled by adjusting the process conditions, with hydrothermal treatment representing an effective and promising method for the chemical recycling of polycarbonate waste within the framework of sustainable circular economy approaches.
Keywords:polycarbonate, hydrothermal degradation, supercritical water, plastic waste, bisphenol A


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