| Summary: | 碩士 === 國立中山大學 === 環境工程研究所 === 102 === This study used waste cooking oil, jatropha oil, castor oil and jatropha oil mix with ratio of 1:1 as the raw material for investigating effects of reaction time, reaction temperature, methanol-to-oil ratio on biodiesel yield by Response surface methodology(RSM). The study speeds up the transesterification and makes the short reaction time under microwave conditions. This study investigated nano-Fe3O4 as the acceptor, CaCl2 as the Ca source, and NaOH as the precipitant. The catalyst is loading with Ca(OH)2 on the pore of nano-Fe3O4 with precipitation. The ingredient and particle size analysis of catalyst can be known from the X-ray Diffractometer (XRD), Energy Dispersive Spectrometry(EDS) and Environment Scanning Electron Micrograph (ESEM). The experimental results revealed that using nano-magnetic Ca(OH)2-nano-Fe3O4 as the catalyst, and waste cooking oil, jatropha oil, castor oil and jatropha oil mix with ratio of 1:1 as the raw material. The best operational condition (yield 95.2 wt%、97.8 wt%、97.6 wt%) includes addition of 2 wt% catalyst, the methanol-to-oil ratio 12:1, reaction temperature 65℃, and reaction time 35 min, 35 min, 60 min. Comparing with three raw material, this data indicates that jatropha oil is better than others raw material for biodiesel production. In the catalyst recycle and reusing experimental results revealed that the catalyst reused after 10 times would lose 5 wt%, then we found this catalyst are recyclability and using jatropha oil as the raw material after reusing 10 times, the biodiesel yield reduse from 97.8 wt% to 97.2 wt%, we found this catalyst are stability. Comparing with traditional heating and microwave heating, this data indicates that transesterification under the microwave condition can save 90 % energy, this way could achieve energy saving.
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