碩士 / 國立臺灣大學 / 化學工程學研究所 / 104 / Microalgae has become a potential resource of biodiesel in recent years for its fast growth, non-food source, and CO2 capture ability. However, efficient and economic production of biodiesel from microalgae is still a challenge. In this study, we presented a novel strategy of direct saponification-esterification conversion (DSEC) from wet microalgae (Chlorella vulgaris) to biodiesel.
The process was accomplished with two consecutive additions into wet algae. With the first addition of NaOH/methanol solution, lipids of triglycerides and free fatty acids were released from disrupted algae and primarily converted into soaps by means of saponification. Then with further HCl/methanol addition, soaps were acidified into free fatty acid and esterified into fatty acid methyl ester (biodiesel).
The experimental results supported several advantages of DSEC process. First, DSEC eliminates lipid extraction/purification step in conventail process, which usually accounts for more than half of production cost. Secondly, compared with the alkali catalyzed transesterification process, DSEC completely alleviated the restriction of incapable of dealing with the case of high content of water and free fatty acid. While compared with acid catalyzed transesterification process, the production time of DSEC was only about one-fifth. For example, at 100oC water bath, with 0.5 ml wet microalgae containing 0.05 g-dried-cell, yielded 0.18 g-biodiesel/g-dried-cell when 1 ml of 2 M NaOH/methanol was added for 20 mins and 2 ml of 1 M HCl/methanol was consequently added for another 15 mins. Moreover, the proposed kinetic model indicated a good fit, and the results in preliminary scale-up reactions further verified the kinetic model.
| Identifer | oai:union.ndltd.org:TW/104NTU05063080 |
| Date | January 2016 |
| Creators | Ying-Ru Fang, 方盈茹 |
| Contributors | Hwai-Shen Liu, 劉懷勝 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 187 |
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