A Comparative Study On Biodiesel Production From Waste Cooking Oils Obtained From Different Sources Using Supercritical Methanol | 72737
Journal of Bioremediation & Biodegradation
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Biodiesel has been considered as a reasonable replacement fuel for petroleum diesel. It has many advantages over petroleum
diesel including its biodegradability and non-toxicity. In addition, it provides free aromatics and sulphur combustion
and it is a greener fuel with lower carbon monoxide and hydrocarbons emissions. However, biodiesel has lower heating value
and it is relatively more expensive than petroleum diesel. In an attempt to reduce the cost of biodiesel, waste cooking oil
(WCO) has been considered as a competitive feedstock. It also provides more sustainability for the produced biodiesel as
it is a result of transformation of waste to greener source of energy. The main concern for using WCO as a feedstock for
biodiesel production is the presence of high concentration of free fatty acids (FFA), which result in saponification reaction
while using the conventional alkaline catalysed process. Saponification lowers the biodiesel yield by preventing the separation
of biodiesel from the product. In this study, a non-catalytic method for biodiesel production from WCO using supercritical
methanol has been investigated. Two different feedstocks with different FFA concentration have been examined. Response
surface methodology (RSM) using Box Behnken Design (BBD) and Central Composite Design (CCD) has been employed to
analyse the effect of different reaction variables including methanol to oil (M:O) molar ratio, temperature, pressure and time on
biodiesel yield. Numerical optimization has been applied to determine the optimum conditions for maximum production of
biodiesel for each feedstock. It has been concluded that the feedstock with higher FFA concentration produce higher biodiesel
yield within the same reaction conditions. This result indicates the significance of using supercritical methanol technique for
feedstocks with high FFA concentration as it enhances both esterification of FFA and transesterification of triglycerides (TG)
to fatty acids methyl esters (FAME).
Omar Aboelazayem is a Teaching Assistant in the Chemical Engineering Department of The British University in Egypt (BUE) (2013-present). He received Bachelor of Science (Honours) (BSc) with Distinction from the BUE in Chemical Engineering (2013). He also earned a validated Bachelor of Engineering Honours degree (BEng) with Distinction in Chemical Engineering (2013) from London South Bank University (LSBU). He has enrolled in LSBU as a PhD student in February 2015. His research is focused on sustainable production of biodiesel from renewable sources. He has published more than 5 research papers from his Doctoral work.
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