Search results for "bioöljyt"
showing 3 items of 3 documents
Valorization potential of technical lignins from Norway spruce (Picea abies) via pyrolysis
2022
Analytical pyrolysis (Py-GC/MS) on mg-scale of Norway spruce (Picea abies)-derived kraft lignin, ethanosolv lignin, and dried lignin-rich soda-anthraquinone (AQ) black liquors was studied at 500 °C to compare the valorization potential of these materials, focusing on the type and yield of condensable pyrolysis products. Of particular interest was the relatively selective formation of guaiacol (2-methoxyphenol) from the dried soda-AQ black liquors in contrast to the formation of complex phenolic product mixtures from the pyrolysis of the kraft and ethanosolv lignins. It was shown that this finding could be attributed to differences in composition and structure as was assessed by various NMR …
Analysis of Lipophilic Extractives from Fast Pyrolysis Bio-Oils
2022
Fast pyrolysis bio-oils (FPBOs) originating from forest residues contain extractive-derived substances, which may form a separate, sticky layer with char particles on the surface of these bio-oils. In this study, first, the removal of extractive-derived substances from the bio-oil top phase was studied by common solvents with different polarities. In this case, the results indicated that when aimed at the maximum yield of single-phase fuel oil and thus the maximum amount of extractives removed, the use of n-heptane or n-hexane seems to be of benefit for this purpose. For safety reasons, the use of n-heptane was recommended. Second, an analysis practice (extraction time and the way of mixing…
Kolmivaiheisen pyrolyysiprosessin mallintaminen
2015
Työssä rakennetun mallin avulla määritettiin kolmivaiheisen hitaan pyrolyysiprosessin massa- ja energiavirrat. Mallissa reaktoriin syötettiin 2 kg tuoretta mäntyä, josta kuivausvaiheen jälkeen saatiin tuotteena 1 kg kuivaa puuta. Lämpötilassa 260 °C suoritetun torrefioinnin kiintosaanto oli 0,84 kg torrefiointiöljyn 0,13 kg ja kaasujen 0,04 kg. Hapan torrefiointiöljy sekä torrefiointikaasut johdettiin ulos prosessista ja torrefioitu puu pyrolysoitiin 450 °C:ssa, jolloin muodostui biohiiltä 0,28 kg, pyrolyysiöljyä 0,35 kg ja pyrolyysikaasuja 0,37 kg kiloa torrefioitua puuta kohti. Kuivausvaihe kulutti energiaa 3260 kJ/kg-tuore puu ja torrefiointi 619 kJ/kg-kuiva puu. Pyrolyysivaihe sen sijaa…