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Energies 2018, 11(9), 2298; https://doi.org/10.3390/en11092298

Improving Biodiesel Conversions from Blends of High- and Low-Acid-Value Waste Cooking Oils Using Sodium Methoxide as a Catalyst Based on a High Speed Homogenizer

1
Department of Environmental Engineering, Kun Shan University, Tainan 71070, Taiwan
2
Green Energy Technology Research Center, Kun Shan University, Tainan 71070, Taiwan
3
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
4
Department of Mechanical Engineering, Kun Shan University, Tainan 71070, Taiwan
*
Author to whom correspondence should be addressed.
Received: 3 August 2018 / Revised: 26 August 2018 / Accepted: 29 August 2018 / Published: 31 August 2018
(This article belongs to the Special Issue Selected Papers from the IEEE ICASI 2018)
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Abstract

Biodiesel is an environmentally friendly and sustainable fuel. However, the high price of the biodiesel produced from pure vegetable oil contributes to making it uncompetitive in the market. If we can make low cost oils such as waste cooking oil and high-acid-value oil available as resources, the cost of biodiesel production will be reduced significantly. However, these low cost oils cannot be used to produce biodiesel directly because they usually contain a large amount of free fatty acids. They have to undergo a preparatory procedure to lower the acid value to a specific value. The purpose of this study was to lower the amount of free fatty acids in waste cooking oils by blending high- and low-value oils at different ratios and to reduce the transesterification reaction time using a high speed homogenizer, which has the potential to easily enlarge the capacity scale. We used a high-acid-value oil to low-acid-value oil volume ratio of 4:6 as a control. A high conversion rate (97.1%) was achieved under the optimal reaction conditions: methanol-to-oil molar ratio, 9:1; amount of catalyst (CH3ONa) used, 0.75 wt %; reaction temperature, 65 °C; rotation speed, 8000 rpm; and reaction time, 8 min. View Full-Text
Keywords: biodiesel; transesterification; waste cooking oil; homogenizer; sodium methoxide biodiesel; transesterification; waste cooking oil; homogenizer; sodium methoxide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Hsiao, M.-C.; Kuo, J.-Y.; Hsieh, P.-H.; Hou, S.-S. Improving Biodiesel Conversions from Blends of High- and Low-Acid-Value Waste Cooking Oils Using Sodium Methoxide as a Catalyst Based on a High Speed Homogenizer. Energies 2018, 11, 2298.

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