摘要
采用功率超声强化酯交换反应制备生物柴油,考察了催化剂和超声参数对醇-油不相容体系酯交换反应的影响。实验结果表明,采用低频超声波(19.7 kHz,100 W)可以大大缩短酯交换反应达到平衡的时间,与机械搅拌反应体系相比,在水浴温度35℃、醇油比6∶1、催化剂1%KOH的条件下,反应时间从60 min缩短至10 min,同时反应的转化率从94%提高到99%,超声波外场的乳化和强化反应起到很好的协同作用。还简单讨论了催化剂(碱种类)、超声频率和功率对生物柴油制备的影响。
A batch ultrasonic enhanced equipment was designed and the effects of ultrasonic energy on the base-catalyst transesterification of soybean oil with methanol to prepare biodiesel （BD） were investigated. It was found that with the help of low frequency ultrasonic （ 19.7 kHz, 100 W） the reaction time was much shorter than that of conventional mechanical agitation. Under this proper low frequency ultrasonic, the reaction conversion achieved almost 100% in 10 minutes at the water bath temperature 35℃ with methanol-oil molar ratio 6：1 and KOH 1% .Furthermore,the power of ultrasonic was quite important to emulsifing immiscible oil-methanol system according to its higher viscosity. In this case, it was not enough to mix the reaction liquids wen by the irradiation of 30 W ultrasonic, which resulted in less conversion efficiency.
出处
《中国油脂》
CAS
CSCD
北大核心
2006年第4期61-64,共4页
China Oils and Fats
基金
杭州市科技计划重点项目资助(编号:200432131)
关键词
生物柴油
超声波
酯交换反应
大豆油
biodiesel
ultrasonic
transesterification
soybean oil
