Synthesis of biodiesel by Fe(II)-Zn double-metal cyanide complexes
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摘要: Fe(Ⅱ)-Zn双金属氰化络合物固体催化剂用于一步催化酯交换和酯化反应制备生物柴油，具有易分离、流程简单，不受水毒性影响的优点。将水溶性金属氰化络合物亚铁氰化钾和金属化合物氯化锌反应，并结合有机配体叔丁醇制备了基于亚铁氰化锌的双金属氰化物络合物（DMC）。并研究了DMC固体催化剂催化菜籽油合成生物柴油过程中，助络合剂种类、催化剂用量、反应温度、醇油摩尔比、反应时间、体系中水和脂肪酸含量等因素对反应过程的影响。研究结果表明，在最佳实验条件下, 甲酯产率最高可达98%。催化剂可循环使用，6次循环使用后回收率仍达93.45%，适宜工业化生产。Abstract: A kind of Fe(II)-Zn double-metal cyanide (DMC) complexes solid catalyst was prepared through coreaction of potassium ferrocyanide, zinc chloride, and complexing agent of tert-BuOH. The catalyst has highly catalytic activity on the simultaneous transesterification of triglycerides and esterification of free fatty acids (FFA) reactions. The effect of various factors on the reaction was studied, including different cocomplexing agents, DMC catalyst amount, reaction temperature, methanol/oil molar ratio, reaction time, and water and fatty acid content in raw materials. High catalytic activity was observed for DMC under relatively higher content of water or FFA. Under the optimum condition the methyl ester yield can reach 98%. 93.45% of the catalyst can be recovered after 6 cycles.
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Key words:
- DMC /
- solid acid /
- transesterification /
- esterification /
- biodiesel
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