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http://dx.doi.org/10.12925/jkocs.2018.35.4.975

Upgrading of Quercus mongollica bio-oil by esterification  

Chea, Kwang-Seok (Wood Chemistry Division, Forest Products Department National Institute of Forest Science)
Lee, Hyung-Won (Wood Chemistry Division, Forest Products Department National Institute of Forest Science)
Jeong, Han-Seob (Wood Chemistry Division, Forest Products Department National Institute of Forest Science)
Lee, Jae-Jung (Wood Chemistry Division, Forest Products Department National Institute of Forest Science)
Ju, Young-Min (Wood Chemistry Division, Forest Products Department National Institute of Forest Science)
Lee, Soo-Min (Wood Chemistry Division, Forest Products Department National Institute of Forest Science)
Publication Information
Journal of the Korean Applied Science and Technology / v.35, no.4, 2018 , pp. 975-984 More about this Journal
Abstract
Fast pyrolysis bio-oil has unfavorable properties that restrict its use in many applications. Among the main issues are high acidity, instability, and water and oxygen content, which give rise to corrosiveness, polymerization during storage, and a low heating value. Esterification and azeotropic water removal can improve all of these properties. A 500 g of Quercus mongollica which grounded 0.8~1.4 mm was processed into bio-oil via fast pyrolysis for 2 seconds at $550^{\circ}C$. The esterification consists of treating pyrolysis oil with a high boiling alcohol like n-butanol at $70^{\circ}C$ under reduced pressure (100 hPa). All products are analyzed for water mass fraction, viscosity, higher heating value, pH, FT-IR and GC/MS. The water mass fraction can be reduced by 91.4 % (from 31.5 % to below 2.7 %), the viscosity by 65.8 % (from 36.5 to 12.5 cP) and the higher heating value can be increased by 96.8 % (from 3,918 to 7,712 kcal/kg), the pH by 1.3 (from 2.7 to 4.0). FT-IR and GC/MS analysis indicated that labile acids, aldehydes, ketones and lower alcohols were transformed to stable target products. Using this approach, the water content of the pyrolysis oil is reduced significantly. These improvements should allow the utilization of upgraded pyrolysis liquids in standard boilers and as fuel in CHP (Combined heat and power) plants.
Keywords
fast pyrolysis; bio-oil; higher heating value; water content; Esterification;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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