Biomass Group, Nanjing Agricultural University, PO Box 68, 40 Dianjiangtai Road, Nanjing 210031

One-step production of biodiesel from Jatropha oils with high acid value by magnetic acid-base amphoteric nanoparticles

Alkaline oxides concerted with acidic -COOFe structure, for the one-pot esterification and transesterification of high AV Jatropha oils without saponification. Zn₈@Fe-C₄₀₀ achieved nearly 100% Jatropha biodiesel yield at 160 ^oC within 4 h, and was used for at least 10 cycles with biodiesel yield of >94.3% at AV of 6.3 mg KOH/g.（磁性酸碱两性催化剂通过两步法合成：羧甲基纤维素钠和Fe³⁺螯合生成的酸性结构-COOFe将碱性氧化物包埋在催化剂的内部，煅烧步骤将部分的-COOFe结构还原成Fe₃O₄，为催化剂引入磁性。合成的Zn₈@Fe-C₄₀₀可以催化酸值为6.3 mg KOH/g的小桐子油获得100.0%的生物柴油产率，循环使用10次小桐子生物柴油的产率仍然大于94.3%）

Recently, Miss Yi-Tong Wang (PhD student from Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences) supervised by Prof. Zhen FANG has synthesized magnetic acid-base amphoteric nanoparticles. Alkaline oxides (ZnFe₂O₄, ferrihydrite, zincite, maghemite and magnetite) concerted with acidic -COOFe structure, benefited the one-pot esterification and transesterification of Jatropha oils with high acid value to produce biodiesel without additional pretreatment. The strong magnetism of catalyst helped catalyst separation for recycle in biodiesel production. Jatropha biodiesel yield of 100% at 160 ^oC within 4 h, with methanol/oil molar ratio of 40/1 and catalyst dosage of 7 wt% was achieved, while the catalyst can be cycled for at least 10 times with biodiesel yield > 94.3% at acid value of 6.3 mg KOH/g. No obvious saponification was observed during the reactions and storage.

The results were published:

YT Wang, Zhen Fang*, XX Yang, YT Yang, J Luo, K Xu, GR Bao. One-step production of biodiesel from Jatropha oils with high acid value at low temperature by magnetic acid-base amphoteric nanoparticles, Chemical Engineering Journal, 348, 929-939 (2018).

https://www.sciencedirect.com/science/article/pii/S1385894718308283

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磁性酸碱两性纳米粒子催化高酸值的小桐子油在低温下一步法制备生物柴油

最近，王一同（女）同学（中国科学院西双版纳热带植物园博士研究生）在方老师的指导下，通过两步法合成了磁性酸碱两性催化剂，并应用于小桐子生物柴油的制备。

该研究通过简易的两步法合成高活性的磁性酸碱两性纳米颗粒，用于高酸值不可食用的小桐子油联合酯化和转酯化反应，一步法制备小桐子生物柴油。在低温160 ^oC反应4 h可以获得100.0%的生物柴油产率，通过简单的磁性分离可以循环使用10次 (产率仍然大于94.3%)，展现了非常出色的工业应用能力。通过半年的常温储存，合成的小桐子生物柴油未发生皂化。

结果发表在Chemical Engineering Journal: Yi-Tong Wang, Zhen Fang*, Xing-Xia Yang, Ya-Ting Yang, Jia Luo, Kun Xu, Gui-Rong Bao. One-step production of biodiesel from Jatropha oils with high acid value at low temperature by magnetic acid-base amphoteric nanoparticles, Chemical Engineering Journal (IF6.7), 348, 929-939 (2018)。