氢氧化钡催化蓖麻油酯交换制备生物柴油

以蓖麻油为原料,用氢氧化钡作为非均相碱催化剂,酯交换反应制备生物柴油.比较了氢氧化钡与其他典型催化剂催化的产率,研究了反应醇油摩尔比、催化剂用量和反应时间对生物柴油收率的影响.结果表明,蓖麻油在以氢氧化钡为催化剂的酯交换反应中适宜条件为:醇油摩尔比为6∶1,蓖麻油与催化剂摩尔比为10∶1,反应时间20min,在此条件下生物柴油收率达98.35%.

Synthesis of biodiesel through transesterification of castor oil catalyzed by barium hydroxide

Biodiesel was prepared from castor oil through the transesterification of the crude oil with methanol using barium hydroxide as a heterogeneous base catalyst.The yields were compared between barium hydroxide and other typical catalysts.The effects of the methanol/oil molar ratio,the concentration of catalyst,and the reaction time on the yield of biodiesel were investigated in detail.It was found that under the optimal reaction conditions,i.e.with methanol/oil molar ratio of 6∶1,oil/catalyst molar ratio of 10∶1,excellent biodiesel yield(98.35%) was obtained at reflux temperature for 20 min.