A novel approach was developed for producing biodiesel by acid ionic liquid catalyzed esterification of oleic acid and methanol under ultrasonic-microwave combined intensification. Four kinds of acid ionic liquids were synthesized as suitable catalysts. Some key parameters affecting oleic acid conversion were investigated using single factor experiments. Moreover, the production process was optimized via response surface methodology. The results indicated that the ionic liquid 1-(4-sulfobutyl)-3-methylmidazolium hydrosulfate exhibits good catalytic performance because of its double acid sites. The ultrasonic-microwave combined assistance can intensify the process to significantly shorten the reaction time from about 180 min to 15 min, thereby affording good industrial application potential. The specified regression model is accurate, reliable, and adequate for simulating actual production; the oleic acid conversion was 97.85 %, which is close to that achieved with conventional methods.

开发了一种在超声波-微波联合强化下通过酸离子液体催化油酸和甲醇酯化生产生物柴油的新方法。合成了四种酸性离子液体作为合适的催化剂。使用单因素实验研究了影响油酸转化的一些关键参数。此外，通过响应面方法优化了生产过程。结果表明，离子液体1-（4-磺丁基）-3-甲基咪唑鎓硫酸氢盐由于具有双酸位而具有良好的催化性能。超声-微波联合辅助可增强工艺，将反应时间从约180分钟大幅缩短至15分钟，从而具有良好的工业应用潜力。指定的回归模型准确，可靠，并足以模拟实际生产；油酸转化率为97.85％，接近于常规方法。