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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 7, No. 1, 2010, pp. 183-213
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Bioline Code: st10020
Full paper language: English
Document type: Review Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 7, No. 1, 2010, pp. 183-213
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Different techniques for the production of biodiesel from waste vegetable oil
Refaat, A. A.
Abstract
The production of biodiesel from waste vegetable oil offers a triple-facet solution: economic,
environmental and waste management. The new process technologies developed during the last years made it possible
to produce biodiesel from recycled frying oils comparable in quality to that of virgin vegetable oil biodiesel with an
added attractive advantage of being lower in price. Thus, biodiesel produced from recycled frying oils has the same
possibilities to be utilized. While transesterification is well-established and becoming increasingly important, there
remains considerable inefficiencies in existing transesterification processes. There is an imperative need to improve the
existing biodiesel production methods from both economic and environmental viewpoints and to investigate alternative
and innovative production processes. This study highlights the main changes occurring in the oil during frying in order
to identify the characteristics of oil after frying and the anticipated effects of the products formed in the frying process
on biodiesel quality and attempts to review the different techniques used in the production of biodiesel from recycled
oils, stressing the advantages and limitations of each technique and the optimization conditions for each process. The
emerging technologies which can be utilized in this field are also investigated. The quality of biodiesel produced from
waste vegetable oil in previous studies is also reviewed and the performance of engines fueled with this biodiesel and the
characteristics of the exhaust emissions resulting from it are highlighted. The overarching goal is to stimulate further
activities in the field.
Keywords
Engine performance; Exhaust emissions; Innovative technologies; Production optimization; Transesterification; Waste utilization
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