Bio-oil production from the torrefied biomass
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Publication Details
Author list: Khumsak O., Wattananoi W., Worasuwannarak N.
Publisher: Hindawi
Publication year: 2011
Start page: 68
End page: 71
Number of pages: 4
ISBN: 9781457713545
ISSN: 0146-9428
eISSN: 1745-4557
Languages: English-Great Britain (EN-GB)
Abstract
Biomass is an important source of renewable energy which is derived from the living mechanism such as photosynthesis of plant due to the lower contents of sulfur and nitrogen in the biomass. Pyrolysis is a technology that can directly produce a liquid fuel from biomass which can be readily stored or transported. However, many researches have reported the negative properties of the bio-oils compare with the conventional fuel oil. The undesirable properties of the bio-oils included low heating value, low pH value, incompatibility with conventional fuels, high viscosity, and chemical instability. These undesirable properties of the bio-oils are mainly brought about by the high oxygen content in the biomass. On the other hand, it is known that the oxygen content in the biomass could be reduced by the torrefaction at the temperatures below 300ฐC. So, in this study we try to upgrade the biomass first by torrefaction at the temperatures below 300ฐC. It was found that the oxygen content of Leucaena leucocephala decreased from 46.2 wt% to 36.7 wt% when torrefy at 303ฐC whereas the torrefied lecaena yields decreased with the increase in torrefaction temperature. Then, the torrefied leucaena will be pyrolysed at 550ฐC to produce bio-oils. The bio-ols were fractionated into light oil and heavy oil fractions which were analyzed by GC-MS to examine the effect of fraction on the bio-oils properties. It was found that the acetic acid and furans were decreased in light oil fraction with the increase in torrefaction temperature. The pH value of bio-oils was slightly increased that was consistent with decreasing of acetic acid in light oil fraction. These results indicated that torrefaction process could improve bio-oils properties prior pyrolysis process. ฉ 2011 IEEE.
Keywords
Bio-oil
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