期刊
ENERGIES
卷 11, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/en11092298
关键词
biodiesel; transesterification; waste cooking oil; homogenizer; sodium methoxide
资金
- Ministry of Science and Technology, Taiwan [MOST 107-2637-E-168 -001]
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 degrees C; rotation speed, 8000 rpm; and reaction time, 8 min.
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