Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.
Bioresour Technol. 2010 Jul;101(14):5394-401. doi: 10.1016/j.biortech.2010.02.060. Epub 2010 Mar 9.
A transesterification reaction of waste cooking oils (WCO) with methanol in the presence of a potassium hydroxide catalyst was performed in a continuous ultrasonic reactor of low-frequency 20 kHz with input capacity of 1 kW, in a two-step process. For the first step, the transesterification was carried out with the molar ratio of methanol to WCO of 2.5:1, and the amount of catalyst 0.7 wt.%. The yield of fatty acid methyl esters (FAME) was about 81%. A yield of FAME of around 99% was attained in the second step with the molar ratio of methanol to initial WCO of 1.5:1, and the amount of catalyst 0.3 wt.%. The FAME yield was extremely high even at the short residence time of the reactants in the ultrasonic reactor (less than 1 min for the two steps) at ambient temperature, and the total amount of time required to produce biodiesel was 15h. The quality of the final biodiesel product meets the standards JIS K2390 and EN 14214 for biodiesel fuel.
在低频 20 kHz、输入功率为 1kW 的连续超声反应器中，采用两步法，用甲醇与废食用油（WCO）进行酯交换反应，催化剂为氢氧化钾。在第一步中，甲醇与 WCO 的摩尔比为 2.5:1，催化剂用量为 0.7wt%。脂肪酸甲酯（FAME）的收率约为 81%。在第二步中，甲醇与初始 WCO 的摩尔比为 1.5:1，催化剂用量为 0.3wt%，FAME 的收率达到 99%左右。在环境温度下，反应物在超声反应器中的停留时间很短（两步加起来不到 1 分钟），但 FAME 的收率非常高，生产生物柴油所需的总时间为 15 小时。最终生物柴油产品的质量符合生物柴油燃料 JIS K2390 和 EN 14214 标准。
