title: Effect of liquefaction temperature on hydroxyl groups of bio-oil from loblolly pine (Pinus taeda).
abstract: Loblolly pine was liquefied with ethylene glycol at 100, 150, 200 and 250 °C in order to analyze the effect of liquefaction temperature on hydroxyl groups of bio-oil, and to determine the source and variation of hydroxyl groups. The optimum temperature was found to be 150-200 °C. Hydroxyl number (OHN) of the bio-oil was ranged from 632 to 1430 mg KOH/g. GC-MS analysis showed that 70-90% of OHN was generated from unreacted EG. (31)P NMR analysis showed that the majority of hydroxyl groups were aliphatic, and none of the bio-oil exhibited any detectable hydroxyl groups from phenolic sources. Finally, it was found that all bio-oils were stable in terms of OHN for 2 months when stored at -10 °C.
authors.affiliation: Forest Product Development Center, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36849, USA; Center for Bioenergy and Bioproducts, Auburn University, Auburn, AL 36849, USA.
authors.forename: Yusuf
authors.initials: Y
authors.lastname: Celikbag
authors.affiliation: Forest Product Development Center, School of Forestry and Wildlife Sciences, Auburn University, Auburn, AL 36849, USA; Center for Bioenergy and Bioproducts, Auburn University, Auburn, AL 36849, USA; Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA. Electronic address: bkv0003@auburn.edu.
authors.forename: Brian K
authors.initials: BK
authors.lastname: Via
authors.affiliation: Center for Bioenergy and Bioproducts, Auburn University, Auburn, AL 36849, USA; Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA.
authors.forename: Sushil
authors.initials: S
authors.lastname: Adhikari
authors.affiliation: Department of Chemistry and Biochemistry, Auburn University, Auburn, AL 36849, USA.
authors.forename: Yonnie
authors.initials: Y
authors.lastname: Wu
mesh_terms: D056804:Biofuels; D001709:Biotechnology / Q000379:methods*; D004951:Esterification; D019855:Ethylene Glycol / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D006900:Hydroxylation; D009682:Magnetic Resonance Spectroscopy; D041603:Pinus taeda / Q000378:metabolism*; D013696:Temperature
chemical_list: D056804:Biofuels; D019855:Ethylene Glycol
keywords: Bio-based polyol; Bio-oil; Biomass liquefaction; Hydroxyl number