微波辅助炭基固体酸催化地沟油制备生物柴油

Preparation of Biodiesel from Waste Oil by Employing a Microwave-Assisted Carbon-Based Solid Acid Catalyst

为研究微波固体酸法制备生物柴油,以炭化-磺化法制备了一种新型炭基固体酸催化剂,于实验室自制微波反应器中催化地沟油制备生物柴油。实验中固体酸催化剂在微波环境下催化活性高、性质稳定,且微波辐射可大幅提高反应速率。对反应条件进行了单因素分析,并针对微波功率密度、微波反应时间、催化剂用量对生物柴油转化率的影响进行了响应面优化设计,得到最佳工艺为:微波功率密度1.15 W/m L,微波反应时间33.33 min,炭基固体酸催化剂用量4.83%(质量分数),最终生物柴油转化率为90.38%。此优化结果与先前单因素实验结果一致,验证了模型的可信度高、拟合度好。

The biodiesel has been successfully produced in a self-designed microwave reactor in laboratory by employing a novel carbon-based acid catalyst prepared via the combination of carbonization and sulfonation process. This work exhibit a potential application of microwave-assisted acid catalyst in biodiesel preparation. The catalyst presented a high efficiency and good stability under microwave treatment with which the reaction was significantly accelerated. The optimization of reaction condition was first studied by a single factor method. The factors which affected the conversion efficiency of biodiesel,such as microwave power density,microwave reaction time,and catalyst amount,were determined accordingly using the response surface analysis.The optimized condition was processed as microwave power density of 1.15 W/m L for 33.33 min with 4.83% catalyst which gave a 90.38% ester yield. This optimized result was consistent with the previous results from the single factor experiments and this model was confirmed with higher reliability and better fitting.