【摘要】 在超声波强化条件下通过化学酯交换工艺从精糠蜡中提取高碳脂肪醇。研究了超声波功率、反应时间、蜡醇比、反应温度以及催化剂用量对二十八烷醇提取效果的影响。通过正交实验,确定了最佳的酯交换工艺参数:超声波功率200 W,反应温度60℃,蜡醇比1∶10,反应时间6 h,催化剂用量1.5%。在此条件下,酯交换产品得率为85.82%,其中二十八烷醇含量为14.68%。与传统酯交换工艺相比,在超声波条件下酯交换反应得到强化,缩短了反应时间,提高了反应产物得率和二十八烷醇含量。更多还原

【Abstract】 The preparation of octacosanol from refined rice bran wax by transesterification assisted with ultrasonic was researched.Effects of the ultrasonic power,reaction time,ratio of wax to ethanol,catalyst dosage and reaction temperature on the transesterification reaction were studied.The results showed that the best conditions were as follows:ultrasonic power 200 W,reaction time 6 h,ratio of wax to ethanol 1∶10,catalyst KOH dosage 1.5% and reaction temperature 60℃.The yield of product was 85.82% under the best conditions.Compared with the transesterification reaction without ultrasonic,the reaction time with ultrasonic was shortened,the yield of product and the concentration of octacosanol were increased.更多还原