硬脂酸催化下超声加速大豆油环氧化的研究

以甲酸为活性氧的载体、硬脂酸为催化剂,在超声条件下对大豆油进行环氧化,考察了甲酸、硬脂酸用量,双氧水与甲酸摩尔比以及超声频率,超声功率,超声温度,超声时间等因素对大豆油环氧值的影响。确定的最佳反应条件为:甲酸用量为大豆油质量的20%,硬脂酸用量为大豆油质量的2.0%,双氧水与甲酸的摩尔比7.76∶1,超声频率28 kHz,超声功率120 W,超声温度65℃,超声时间30 min。在最佳反应条件下得到的环氧大豆油环氧值为5.93%,比相同反应时间内非超声反应得到的环氧大豆油环氧值提高了17.19%,而且在达到相同环氧值时,超声条件比非超声条件的反应时间缩短了一半。

Ultrasound-assisted epoxidation of soybean oil catalyzed by stearic acid

Soybean oil was epoxided by the assist of ultrasonic irradiation in the presence of formic acid as the carrier of active oxygen and stearic acid as the catalyst. The parameters affecting the epoxy value of soybean oil such as the amount of formic acid, stearic acid and hydrogen peroxide, as well as the ultrasonic frequency, power, temperature and time were discussed. It found that the epoxy value of epoxidized soybean oil(ESBD)reached 5.93% under the optimum conditions of amount of formic acid 20%, stearic acid 2.0%, molar ratio of hydrogen peroxide to formic acid 7.76:1,ultrasonic frequency 28 kHz,power 120 W, temperature 65 ℃, ultrasonic time 30 min. The epoxy value of epoxidized soybean oil treated by ultrasound increased by 17.19% compared with that treated by non-ultrasound in the same reaction time, and the epoxidation time reduced nearly half compared with that treated by non-ultrasound in the same epoxy value.