超临界条件连续操作制备生物柴油的初步研究

The Primary Study of Continuous Preparation of Biodiesel under Supercritical Condition

生物柴油是用动植物油脂或长链脂肪酸与甲醇等低碳醇合成的脂肪酸酯。是一种新兴的替代能源。对在压力9～21MPa、温度260～400℃的超临界甲醇条件下在连续化装置中制备生物柴油进行了探索性研究。讨论了不同的反应时间、温度、压力及摩尔比对大豆油转化率的影响。实验结果表明，连续操作的转化率比超临界条件下高压釜中间歇式操作低，这主要是由于甲醇与大豆油的混合状况不好引起的，井提出了在甲醇中添加有机溶剂、采用更好的混合器等改进方法。

Biodiesel, an alternative diesel fuel, fatty acid alkyl ester, is prepared from renewable biological sources such as vegetable oils and animal fats. In this paper the experiment was carried out in continuous flow tubular reactor with the pressure 9-21 MPa and the temperature 260-400℃. The influence of reaction time, temperature, pressure, and molar ratio of methanol to soybean oil were discussed. The experiment results showed that the conversion of soybean oil was lower than that of batch operation in autoclave, which was caused for methanol was not mixed Well with soybean oil. To improve mixing effect between methanol and oil, the cosolvent or mixer were needed.