Production of heavy oils with high caloric values by direct liquefaction of woody biomass in sub/near-critical water
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 635-642 |
Journal / Publication | Energy and Fuels |
Volume | 22 |
Issue number | 1 |
Publication status | Published - Jan 2008 |
Externally published | Yes |
Link(s)
Abstract
Direct liquefaction of a woody biomass (Jack pine sawdust) in sub/ near-criitical water without and with catalysts (alkaline earth and iron ions) has been investigated at temperatures of 290-380 °C. Heavy oils with a high caloric value of 30-35 MJ/kg (much greater than that of the crude wood sample used) were obtained, along with water soluble oils with a caloric value of 19-25 MJ/kg. The yields of heavy oil and total oil products tended to maximize in the temperature range of 280-340 °C for all the liquefaction operations regardless of the presence of a catalyst or the type of catalyst. All the catalysts tested, i.e., Ca(OH)2, Ba(OH)2, and FeSO4, were found effective for enhancing the formation of heavy oil products at 280-340 °C, while they significantly promoted the formation of gas and water at > 340 °C. The yield of heavy oil in the operation at 300 °C for 30 min was improved significantly from around 30% without catalyst to greater than 45% by Ba(OH)2. The maximum yield of total oil products reached 51% in the operation without catalyst, while it increased to about 65% with Ca(OH)2 at 300 °C. The GUMS measurements for the heavy oil products revealed that the oils contain mainly carboxylic acids, phenolic compounds and derivatives, and long-chain alkanes. © 2008 American Chemical Society.
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Citation Format(s)
Production of heavy oils with high caloric values by direct liquefaction of woody biomass in sub/near-critical water. / Xu, Chunbao; Lad, Nimisha.
In: Energy and Fuels, Vol. 22, No. 1, 01.2008, p. 635-642.
In: Energy and Fuels, Vol. 22, No. 1, 01.2008, p. 635-642.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review