Advances in direct transesterification of algal oils from wet biomass

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An interest in biodiesel as an alternative fuel for diesel engines has been increasing because of the issue of petroleum depletion and environmental concerns related to massive carbon dioxide emissions. Researchers are strongly driven to pursue the next generation of vegetable oil-based biodiesel. Oleaginous microalgae are considered to be a promising alternative oil source. To commercialize microalgal biodiesel, cost reductions in oil extraction and downstream biodiesel conversion are stressed. Herein, starting from an investigation of oil extraction from wet microalgae, a review is conducted of transesterification using enzymes, homogeneous and heterogeneous catalysts, and yield enhancement by ultrasound, microwave, and supercritical process. In particular, there is a focus on direct transesterification as a simple and energy efficient process that omits a separate oil extraction step and utilizes wet microalgal biomass; however, it is still necessary to consider issues such as the purification of microalgal oils and upgrading of biodiesel properties.
Publisher
ELSEVIER SCI LTD
Issue Date
2015-05
Language
English
Article Type
Review
Keywords

IN-SITU TRANSESTERIFICATION; DOCOSAHEXAENOIC ACID (DHA)-RICH; OLEAGINOUS CHLORELLA SP; LIFE-CYCLE ASSESSMENT; HOT-WATER EXTRACTION; BIODIESEL PRODUCTION; LIPID EXTRACTION; CELL DISRUPTION; HYDROTHERMAL LIQUEFACTION; SWITCHABLE SOLVENTS

Citation

BIORESOURCE TECHNOLOGY, v.184, pp.267 - 275

ISSN
0960-8524
DOI
10.1016/j.biortech.2014.10.089
URI
http://hdl.handle.net/10203/198210
Appears in Collection
CBE-Journal Papers(저널논문)
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