Monday, May 5, 2008
9-19

Biodiesel production from various oils in supercritical fluid condition by Candida antartica lipase B and its analysis using solubility of fatty acids

Jong Ho Lee1, Cheong Hoon Kwon1, Yoon Seok Song1, Jeong Won Kang1, Seung Wook Kim*1, Jung Soo Lim2, and Chulhwan Park3. (1) Department of Chemical and Biological Engineering, Korea University, 1, Anam-dong, Sungbuk-ku, Seoul, South Korea, (2) Digital Appliances R&D Team, Samsung Electronics Co. Ltd, 416 Maetan-3Dong, Yeongtong-Gu, Suwon-City, South Korea, (3) Department of Chemical Engineering, Kwangwoon University, 447-1, Wolgye-Dong, Nowon-Gu, Seoul, South Korea

In this study, we considered the reaction factors, such as pressure, temperature, agitation speed, enzyme concentration, and water contents to increase biodiesel production in supercritical fluid condition. In addition, to establish enzymatic process on biodiesel production, it was produced from various oils. Optimal points were as follows: pressure 130 bar, temperature 45 °C, agitation speed 200 rpm, enzyme concentration 20% and water contents 10%. Among various oils such as soybean, palm, rapeseed, sunflower and olive oils, olive oil showed the highest yield on transesterification and its conversion yield was 65.18% because of high solubility in supercritical carbon dioxide. However, in batch system, conversion yield of biodiesel was not increased over 65 %. Therefore, stepwise reaction was carried out for the improvement of biodiesel production. When initial concentration of methanol was 90 mmol in reaction medium and then 90 mmol of methanol was added every 2 h during biodiesel production, conversion yield of biodiesel was 98.92 % at 6 h. Finally, reusability was carried out using immobilized lipase. In repeated biodiesel production, biodiesel conversion was maintained at over 85 % after 8 reuses.

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