固体碱氧化钙催化蓖麻油酯交换制备生物柴油

Transesterification of Castor Oil to Biodiesel Using CaOas a Solid Base Catalyst

制备了固体碱氧化钙催化剂,并用XRD技术、低温氮气吸附-脱附技术对其进行了表征。对固体碱氧化钙催化蓖麻油酯交换制备生物柴油进行了研究。考察了反应温度、醇油摩尔比、催化剂质量分数及反应时间对甲酯收率的影响。在反应温度为65℃、醇油摩尔比为9∶1、催化剂质量分数为1.5%、反应时间为2.5 h的优化工艺条件下,甲酯收率平均可达92%。用气相色谱法对产品进行了分析,甲酯质量分数为97.6%。产品后处理简单,对环境无污染且催化剂可活化再生,重复使用。

The solid base catalyst CaO was prepared and characterized by XRD technique and low temperature nitrogen adsorption--desorption technique respectively. Transesterification of castor oil to biodiesel using CaO as a solid base catalyst was studied. The separate effects of reaction temperature, molar ratio of methanol to oil, catalyst dosage and reaction time on methyl ester yield were investigated. Under the optimal conditions of reaction temperature 65℃, molar ratio of alcohol to oil 9 ： 1, mass fraction of catalyst 1.5% and reaction time 2.5 h, the methyl ester average yield is 92%. The product was analyzed by gas chromatographic technique and mass fraction of methyl ester is 97.6%. The products after reaction is dealt with easily and the environment is not polluted and the catalyst can be activated and reused.