Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
Graduate School of Biochemical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan.
Bioresour Technol. 2019 Oct;289:121770. doi: 10.1016/j.biortech.2019.121770. Epub 2019 Jul 7.
This study developed a novel in situ transesterification process by combining the solvent and catalyst functions of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) for biodiesel synthesis from spent coffee grounds (SCG). The influence of reaction parameters on the reaction was investigated. The maximum biodiesel yield of 96.13% was observed at DBU-to-SCG and methanol-to-SCG ratios of 20 and 10 mL/g, respectively; a reaction temperature of 130 °C; and a reaction time of 60 min. Notably, the polarity of DBU could be reversibly regulated, thus facilitating excellent product separation. Moreover, DBU could be effectively reused for 10 cycles to yield high biodiesel conversion. DBU-catalyzed in situ transesterification of SCG is a promising, ecofriendly, and economically viable biodiesel production process.
本研究通过结合 1,8-二氮杂双环[5.4.0]十一碳-7-烯（DBU）的溶剂和催化剂功能，开发了一种从废咖啡渣（SCG）合成生物柴油的新型原位酯交换工艺。考察了反应参数对反应的影响。在 DBU 与 SCG 的比例为 20，甲醇与 SCG 的比例为 10 mL/g，反应温度为 130°C，反应时间为 60 min 的条件下，生物柴油的最大产率为 96.13%。值得注意的是，DBU 的极性可以可逆调节，从而有利于优异的产物分离。此外，DBU 可以有效重复使用 10 次，以获得高的生物柴油转化率。DBU 催化 SCG 的原位酯交换是一种很有前途、环保且经济可行的生物柴油生产工艺。
