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以氧化钙为固体催化剂,采用16.5kHz、25kHz、40kHz的超声强化玉米油与甲醇的酯交换反应。结果表明,与常规方法相比,达到同样的转化率,超声强化可使反应时间由300min减少至180min,催化剂用量由油脂质量的2%降至0.5%,超声参数(频率、声强)对酯交换反应有重要影响。在本文的试验条件下,频率低、声强高对反应有利。当催化剂用量为油脂质量0.5%,甲醇与油脂摩尔数之比为6∶1,温度65～66℃时,采用25kHz,0.46W/cm2的超声作用180min,酯交换转化率达97.2%～98.2%,且催化剂可重复使用。
Using calcium oxide as solid catalyst, the transesterification of corn oil and methanol was intensified by ultrasonic at 16.5kHz, 25kHz and 40kHz. The results showed that compared with the conventional method, the same conversion was achieved. The ultrasonic treatment reduced the reaction time from 300 min to 180 min, and the amount of catalyst decreased from 2% to 0.5% of the mass of the oil. Ultrasound parameters (frequency and intensity) Exchange reaction has a significant impact. Under the experimental conditions in this paper, the frequency is low and the sound intensity is good for the reaction. When the amount of catalyst is 0.5% of the mass of grease, the molar ratio of methanol to oil is 6:1 and the temperature is 65 ~ 66 ℃, the conversion of transesterification reaches 97.2% ~ 98.2% with the ultrasonic wave of 25kHz and 0.46W / cm2 for 180min. , And the catalyst can be reused.