20.500.12556/DKUM-97348 Razgradnja bisfenola A (BPA) s hidrotermičnim postopkom magistrsko delo Degradation of bisphenol A (BPA) by hydrothermal process Bisfenol A (BPA) je organska spojina z dvema fenolnima skupinama, ki je osnovna monomerna enota polikarbonatnih plastik in spada med najpomembnejše industrijske kemikalije. Zaradi ugodnih mehanskih in termičnih lastnosti se široko uporablja pri proizvodnji polikarbonatov in epoksidnih smol. Konvencionalni postopki razgradnje BPA so pogosto energetsko potratni in ekonomsko zahtevni, zato se vse več pozornosti namenja alternativnim metodam, med katerimi izstopa hidrotermična razgradnja v subkritični vodi, ki omogoča učinkovito pretvorbo BPA v vredne produkte z manjšo okoljsko obremenitvijo. Namen magistrske naloge je bil preučiti razgradnjo BPA v podkritični vodi ter vpliv procesnih parametrov na potek reakcije. Eksperimenti so bili izvedeni v šaržnem reaktorju pri temperaturah med 250 in 350 °C, reakcijskih časih od 5 do 30 minut ter razmerjih voda/material med 5 in 15 mL/g. Eksperimentalni načrt je temeljil na metodi odzivnih površin z Box–Behnkenovim načrtom, na podlagi katerega so bili razviti matematični modeli in izvedena optimizacija procesa. Analiza produktov z metodami TGA, DSC, GC-FID in TOC-L je pokazala, da imata temperatura in čas reakcije ključen vpliv na razgradnjo BPA, medtem ko je vpliv razmerja voda/material manj izrazit. Z naraščajočo temperaturo in časom se je povečala stopnja razgradnje BPA. Ugotovljena reakcijska pot vključuje hidrolizo BPA do 4-izopropenilfenola in fenola, pri čemer v končni fazi reakcije fenol predstavlja prevladujoči produkt razgradnje. Bisphenol A (BPA) is an organic compound with two phenolic groups and serves as the basic monomer unit of polycarbonate plastics, making it one of the most important industrial chemicals. Due to its favourable mechanical and thermal properties, it is widely used in the production of polycarbonates and epoxy resins. Conventional BPA degradation processes are often energy-intensive and economically demanding, so increasing attention is being given to alternative methods. Among these, hydrothermal degradation in subcritical water stands out, as it enables the efficient conversion of BPA into valuable products with a lower environmental impact. The purpose of the master's thesis was to investigate the degradation of BPA in subcritical water and the influence of process parameters on the reaction. The experiments were conducted in a batch reactor at temperatures between 250 and 350 °C, reaction times from 5 to 30 minutes, and water-to-material ratios between 5 and 15 mL/g. The experimental design was based on response surface methodology using a Box–Behnken design, on which mathematical models were developed, and process optimisation was performed. Analysis of the products using TGA, DSC, GC-FID, and TOC-L methods showed that temperature and reaction time have a key influence on BPA degradation, while the effect of the water-to-material ratio is less pronounced. The degradation rate of BPA increased with higher temperature and longer reaction time. The identified reaction pathway involves the hydrolysis of BPA to 4-isopropenylphenol and phenol, with phenol being the dominant degradation product in the final reaction phase. hidrotermična razgradnja bisfenol A BPA podkritična voda metoda odzivnih površin fenol hydrothermal degradation bisphenol A BPA subcritical water response surface method phenol true true false [A. Koman] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-03-02 10:15:27 2026-03-20 07:29:04 2026-03-25 03:13:46 0000-00-00 00:00:00 2026 0 Maribor 0 Maribor 1 spletni vir (1 datoteka PDF (XI, 58 str.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 66.092:547.568.5(043.2) 272745219 MAG_Koman_Anja_2026.pdf MAG_Koman_Anja_2026.pdf 1 F4B97BE9B642E361FDFBD78B1BB6F811 5b2330414944ada0f3c7ac8b594a113c8bef9ed2eaf2d649c5aeb0ff77e6be9b 60785f59-23ad-11f1-9193-00155d0001a1 https://dk.um.si/Dokument.php?lang=slv&id=204666 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0