助溶剂法管道反应连续制备生物柴油

Continuous Preparation of Biodiesel in a Tubular Reactor with Co-Solvent

在菜籽油和甲醇以KOH为催化剂的酯交换反应中,加入助溶剂形成均相,在管道反应器内进行连续反应生成生物柴油。通过三相图的绘制,选择了甲基叔丁基醚作为助溶剂并确定了其加入量;考察了醇油物质的量比、催化剂用量、反应温度和反应停留时间对反应的影响。通过正交实验方法得出最佳工艺条件为醇油物质的量比为27∶1,助溶剂和油的体积比为1.6∶1,催化剂用量0.5%,反应温度65℃,反应停留时间1 h,在此反应条件下粗菜籽油的转化率可达到98.4%。

Biodiesel was continuously manufactured through transesterification of rape oil with methanol using KOH as a catalyst and MTBE as a co-solvent, in which the reaction took place in a homogeneous phase. Based on the oil, methanol and co-solvent ternary phase diagram, the selection and addition dosage of co-solvent was discussed. The influences of molar ratio of methanol to oil, amount of KOH, reaction temperature and residence time on reaction were measured. By an orthogonal experimental method, the optimum conditions were observed as follows： molar ratio of methanol to oil 27 ： 1, amount of KOH 1.0%, reaction temperature 65 ℃ and reaction time 1 h. The conversion of rape oil was 98.4% under these conditions.