magistrsko delo
Monika Vidmar (Author), Blaž Likozar (Mentor), Franc Požgan (Thesis defence commission member), Matija Strlič (Thesis defence commission member), Irena Kralj Cigić (Co-mentor)

Abstract

Težava današnje družbe je pridobivanje čiste in cenovno ugodne energije. Med potencialnimi vir energije je tudi biomasa. Glavna komponenta le-te je tudi lignin, iz katerega se lahko poleg goriva pridobiva še kemikalije, ki so veliko v uporabi. Da lahko lignin uporabimo, pa je potrebno ohraniti večji delež etrskih vezi, med katerimi prevladuje β-O-4 vez. V magistrskem delu sem s pomočjo modelne spojine preiskovala cepitev β-O-4 vezi, pri različnih pogojih, ki se uporabljajo pri organosolv postopku izolacije lignina. Preiskovala sem mehanizem cepitve etrske vezi in stranske reakcije, katerih produkte sem analizirala z različnimi tehnikami, kot so to na primer FTIR, GC-MS, UV-VIS spektroskopija in 1H NMR. Nato sem z izbranimi pogoji reakcije preučevala tudi izolacijo lignina iz biomase. Spremljala sem cepitev etrskih vezi s pomočjo FTIR, SEC, 2D HSQC, 31P NMR in UV-VIS spektroskopije. Rezultate sem primerjala z reakcijo modelne spojine 2-fenoksi-1-feniletanola in potrdila, da je bilo pri nižji temperaturi ohranjenih več etrskih vezi. Poiskala sem tudi možne korelacije med analiznimi tehnikami, ki bi bile uporabne pri izdelavi mikrokinetičnega modela za nadaljnje raziskovanje.

Keywords

lastnosti lignina;izolacija lignina;organosolv lignin;modelne spojine;ß-O-4;analizne metode;magistrska dela;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher: [M. Vidmar]
UDC: 665.947.4(043.2)
COBISS: 158642435 Link will open in a new window
Views: 75
Downloads: 22
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Other data

Secondary language: English
Secondary title: Comparison of different structural evaluations of lignin as determination of kinetic clusters
Secondary abstract: The problems of today's society include obtaining clean and affordable energy. Among the potential source of energy is also biomass. The main component of biomass is also lignin, which is used to produce fuel as well as chemicals that are widely used. For the efficient use of lignin, it is necessary to maintain a greater proportion of ether bonds, in which β-O-4 bond predominates. In my master's thesis, I investigated the cleavage of β-O-4 bond by using a model molecule under various conditions used in the organosolv isolation process of lignin. I studied the mechanism of ether bond cleavage and side reactions, the products of which were analysed using various techniques such as FTIR, GC-MS, UV-VIS spectroscopy, and 1H NMR. I then studied the isolation of lignin from biomass using the selected reaction conditions. I monitored the cleavage of ether bonds using FTIR, SEC, 2D HSQC, 31P NMR, and UV-VIS spectroscopy. I compared the results with the reaction of the model molecule 2-phenoxy-1-phenylethanol and confirmed that at lower temperatures, more ether bonds were preserved. I also searched for possible correlations between analytical techniques that could be useful in developing a microkinetic model for further research.
Secondary keywords: organosolv lignin;model molecule;ß-O-4;Lignin;Univerzitetna in visokošolska dela;
Type (COBISS): Master's thesis/paper
Study programme: 1000375
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, smer Kemija
Pages: 62 str.
ID: 19104487