Department of Civil and Environmental Engineering, KAIST, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea.
Clean Fuel Department, Korea Institute of Energy Research, 152 Gajeong-ro, Yuseong-gu, Daejeon 305-343, Republic of Korea.
Bioresour Technol. 2015 Sep;191:420-5. doi: 10.1016/j.biortech.2015.02.083. Epub 2015 Feb 26.
In this study, pyrite (FeS2) was used for lipid extraction as well as esterification processes for microalgae-based biodiesel production. An iron-mediated oxidation reaction, Fenton-like reaction, produced an expected degree of lipid extraction, but pyrite was less effective than FeCl3 commercial powder. That low efficiency was improved by using oxidized pyrite, which showed an equivalent lipid extraction efficiency to FeCl3, about 90%, when 20 mM of catalyst was used. Oxidized pyrite was also employed in the esterification step, and converted free fatty acids to fatty acid methyl esters under acidic conditions; thus, the fatal problem of saponification during esterification with alkaline catalysts was avoided, and esterification efficiency over 90% was obtained. This study clearly showed that pyrite could be utilized as a cheap catalyst in the lipid extraction and esterification steps for microalgae-based biodiesel production.
在这项研究中，黄铁矿 (FeS2) 被用于脂类提取以及微藻生物柴油生产中的酯化过程。铁介导的氧化反应，类 Fenton 反应，产生了预期的脂类提取程度，但黄铁矿的效果不如 FeCl3 商业粉末。通过使用氧化黄铁矿，可提高其效率，当使用 20mM 的催化剂时，其显示出与 FeCl3 相当的脂类提取效率，约为 90%。氧化黄铁矿也被用于酯化步骤，在酸性条件下将游离脂肪酸转化为脂肪酸甲酯；因此，避免了碱性催化剂酯化过程中皂化这一严重问题，并获得了超过 90%的酯化效率。本研究清楚地表明，黄铁矿可用作微藻生物柴油生产中脂类提取和酯化步骤中的廉价催化剂。
