活性炭负载型固体碱催化酯交换反应的研究

Study on Transesterification Catalyzed by Solid Base Supported on Activated Carbon

采用浸渍法制备了活性炭负载KOH固体碱催化剂,考察了它们在三醋酸甘油酯与甲醇酯交换反应中的催化性能,及时间、温度、催化剂用量、醇酯摩尔比等因素对酯交换反应的影响。结果表明,当醇酯比为9∶1,催化剂用量为0.3g(三醋酸甘油酯为0.02mol),KOH浸渍液浓度为20.0wt%,反应温度为65℃,反应1.0h,三醋酸甘油酯转化率可达到94.7%。该工艺操作简单,催化剂可以回收,过程无三废污染。

Transesterification of glycerol triacetate and methanol catalyed by KOH supported on activated carbon was studied. The catalyst was prepared by impregnation and had a high catalysis activity. Effects of some factors on the transesterification were investigated systematically and reaction conditions were optimized. The optimized reaction conditions on the catalyst were： molar ratio of methanol to oil 9：1, the amount of catalyst 0.3g（the amount of glycerol triacetate 0.02mol）, the consistency of KOH 20.0wt%, reaction temperature 65 ℃ and reaction time 1.0h, under these conditions the conversion ofbiodiesel reached 94.7%. The new technology featured simplicity, reusable catalyst, zero pollution.