Effect of liquefaction temperature on hydroxyl groups of bio-oil from loblolly pine (Pinus taeda)

Yusuf Celikbag; Brian K Via; Sushil Adhikari; Yonnie Wu

doi:10.1016/j.biortech.2014.07.075

Effect of liquefaction temperature on hydroxyl groups of bio-oil from loblolly pine (Pinus taeda)

Bioresour Technol. 2014 Oct:169:808-811. doi: 10.1016/j.biortech.2014.07.075. Epub 2014 Jul 27.

Authors

Yusuf Celikbag¹, Brian K Via², Sushil Adhikari³, Yonnie Wu⁴

Affiliations

¹ 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.
² 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: [email protected].
³ Center for Bioenergy and Bioproducts, Auburn University, Auburn, AL 36849, USA; Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA.
⁴ Department of Chemistry and Biochemistry, Auburn University, Auburn, AL 36849, USA.

PMID: 25113882
DOI: 10.1016/j.biortech.2014.07.075

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.

Keywords: Bio-based polyol; Bio-oil; Biomass liquefaction; Hydroxyl number.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

Biofuels*
Biotechnology / methods*
Esterification
Ethylene Glycol / chemistry
Gas Chromatography-Mass Spectrometry
Hydroxylation
Magnetic Resonance Spectroscopy
Pinus taeda / metabolism*
Temperature*

Substances

Biofuels
Ethylene Glycol