超声波预处理协同固体酸水解小麦秸秆制备乙酰丙酸的研究

目的]研究超声波预处理协同固体酸水解小麦秸秆制备乙醇丙酸。方法]以小麦秸秆为原料,采用超声波预处理和固体酸协同水解制备了乙酰丙酸,探讨了经过超声波预处理后水解温度、水解时间、固体酸用量、液固比对乙酰丙酸得率的影响,并采用响应面法建立二次回归模型对水解工艺进行了优化。结果]乙酰丙酸的得率与固体酸用量、水解温度、液固比和水解时间等工艺有关;得出最优工艺条件为：水解温度235℃、反应时间35min、固体酸的用量为7.4%,此时乙酰丙酸的得率为22.98%,比在相同工艺条件下未超声波处理的得率提高了10.25%。结论]在固体酸水解小麦秸杆制备乙酰丙酸过程中,通过超声波预处理的协同反应,能够有效提高乙酰丙酸的得率。

Preparation of Levulinic Acid with Synergistic Hydrolysis of Ultrasonic Pretreatment and Solid Acid from Wheat Straw

Objective] The aim was to study the preparation of levulinic acid(LA)with synergistic hydrolysis of ultrasonic pretreatment and solid acid from wheat straw.Method] Taking wheat straw as material,LA was prepared from wheat straw via the synergistic hydrolysis of ultrasonic pretreatment and solid acid,and effects of hydrolysis temperature,hydrolysis time,the amount of solid acid and liquid-solid ratio on LA yield were explored,meanwhile quadratic regression model was established by response surface methodology so as to optimize the hydrolysis technology.Result] LA yield was related to hydrolysis temperature,hydrolysis time,the amount of solid acid and liquid-solid ratio.The optimal hydrolysis technology was:hydrolysis temperature was 235 ℃;hydrolysis time was 35 min,and the amount of solid acid was 7.4%.LA yield under this condition was 22.98%,which was increased by 10.25% comparing with that of non-ultrasonic pretreatment at the same condition.Conclusion] LA yield can be effectively improved via the synergistic hydrolysis of ultrasonic pretreatment and solid acid.