Effect of in-situ hydrogen forming reagents on hydrothermolysis of organosolv lignin
Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussa › Konferenssiesitys ›
Lignin (5 g) and catalysts (0.5 g) were mixed with distilled water (200 mL) prior to carrying out hydrothermolysis at 310 °C for 60 min (Parr 4575 batch reactor). Bio-oil was extracted from the aqueous reaction mixture with ethyl acetate followed by drying. Monoaromatic compounds were calculated with gas chromatography and mass spectroscopy (GC-MS) and molar mass distributions of bio-oil samples were analysed with gel permeation chromatography (GPC) for understanding the effects of used catalyst.
The bio-oil yield increased from 12 wt. % (without catalyst) to 13.9 and 14.1 wt.% with sodium formate and formic acid, respectively. GC-MS analysis of bio-oil samples revealed that the yield and composition of monoaromatics were significantly different depending on type of the catalyst. The amount of monoaromatics increased from 55 mg g-1 of lignin in the absence of a catalyst to 92 mg g-1 of lignin by the addition of sodium formate, while it decreased to 42 mg g-1 of lignin when formic acid was added as a catalyst.
Syringol (36 mg g-1 of lignin), guaiacol (24 mg mg g-1 of lignin), 3-methoxycatechol (9 mg g-1 of lignin), pyrocatechol (7 mg g-1 of lignin) and, 4-methylsyringol (4 mg g-1 of lignin) were identified in the bio-oil sample obtained with sodium formate. The GPC analysis revealed a mean average molar mass (Mw) of 207 g/mol and a molar mass dispersity (D) of 1.1, which is about one tenth of the molar mass of the initial organosolv lignin. A D value greater than 1 indicates the presence of dimers and some other higher molecular weight compounds.
|Tila||Julkaistu - 2019|
|Tapahtuma||International Forest Biorefining Conference - Leakhead University, Thunder Bay, Kanada|
Kesto: 9 kesäkuuta 2019 → 14 kesäkuuta 2019
|Conference||International Forest Biorefining Conference|
|Ajanjakso||09/06/2019 → 14/06/2019|