固体杂多酸催化制备芸芥生物柴油

研制出清洁、环境友好的制备生物柴油的方法。以固体杂多酸Cs2.5H0.5PW12O40为非均相催化剂,芸芥植物油为原料,与甲醇进行酯交换反应制备生物柴油。考查了反应时间、反应温度、醇油摩尔比、催化剂用量及催化剂的使用次数对芸芥油转化率的影响。探究出制备生物柴油的最佳反应条件。与传统的均相催化剂(H2SO4、NaOH)相比,固体杂多酸Cs2.5H0.5PW12O40表现出相同的催化活性,并易于分离,可重复使用。而且杂多酸的催化活性不受芸芥油中游离脂肪酸和水含量的影响。可在短时间、低温(室温)条件下完成酯化反应。结果表明,耐水型Cs2.5H0.5PW12O40是制备生物柴油的环境友好型固体酸催化剂。芸芥生物柴油的各项指标符合美国生物柴油标准。

Transesterification of vegetable oil to biodiesel using a heteropolyacid solid catalyst

A clean,facile,ecologically friendly method of production of biodiesel has been developed.A solid acid,namely heteropolyacid(HPA) Cs2.5H0.5PW12O40 has been used as a heterogeneous catalyst for the production of biodiesel from Eruca Sativa Gars oils(ESG oil) with methanol at certain temperature.A study for optimizing the reaction conditions such as the reaction time,temperature,the oil to methanol ratio,the amount of catalyst,and the usage times of the catalyst,have been performed.The Cs2.5H0.5PW12O40 heterogeneous acid catalyst shows almost the same activity under the optimized reaction conditions compared to conventional homogeneous catalyst such as sodium hydroxide or sulfuric acid,and can easily be separated from the products and can be used more times.The most important feature of this catalyst is that the catalytic activity is not effected by the content of free fatty acid and content of water in the vegetable oil and the esterification can occur at a lower temperature(room temperature) and be finished within a shorter time.The results illustrate that the Cs2.5H0.5PW12O40 is an excellent water-tolerant and environmentally benign solid acid catalyst for production of biodiesel.The fuel properties of ESG biodiesel are found to be in agreement with ASTM standard.