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Cilj diplomske naloge je bilo ugotoviti, katere industrijsko zanimive produkte bi bilo mogoče dobiti s hidrotermičnim procesiranjem papirnih odpadkov v subkritični vodi. Hidrotermično obdelavo papirnih odpadkov smo izvajali v šaržnem reaktorju. Reakcije so potekale pri visoki temperaturi (nad 200 °C) in povišanim tlakom (dovolj visok, da je voda ostajala v tekočem stanju). Iskali smo optimalne pogoje ( temperaturo in rakcijski čas), ki so nam dali najboljše željene izkoristke baznih kemikalij (furfural, 5-HMF, levulinske kisline) Po hidrotermični obdelavi odpadnega papirja smo opravili filtracijo in ostanek spirali z vodo in acetonom, ter tako pridobili vodno in acetonsko fazo. Vodno fazo reakcije smo analizirali s pomočjo HPLC metode z uporabo UV detektorja. Kot mobilno fazo smo uporabili vodo. Z eksprimentalnim delom smo določili optimalne pogoje hidrotermične razgradnje odpadnega papirja, ter prišli do ugotovitev, da so pri višjih temperaturah in krajših reakcijskih časih deleži 5-HMF, furfurala in levulinske kisline večji, kot pa pri nižjih temperaturah in daljših reakcijskih časih. The objective of diploma was to determine which industrially interesting products could be obtained by hydrothermal processing of paper waste in subcritical water. Hydrothermal processing of paper waste was carried out in batch reactor. The reactions were carried out at high temperature (above 200 °C) and elevated pressure (high enough that water remained in a liquid state). We were looking for the optimum conditions ( temperature and reaction time), which gave us the highest yield of base chemicals (furfural, 5-HMF, levulinic acid). After hydrothermal processing of waste paper, we performed filtration. The solid residue was washed with water and acetone, which gave us water and acetone phase. The aqueous phase of the reaction was analyzed by HPLC using UV detector. As the mobile phase water was used. Sugars and derivatives of sugars were detected with the help of the RID, while the other components were detected at 210 nm and 280 nm using UV detector. With experimental work, we have identified the optimal conditions of hydrothermal decomposition of paper waste, and have come to a conclusion that at higher temperatures and shorter reaction times yieldsof 5-HMF, furfural and levulinic acid are higher, than at lower temperatures and longer reaction times.