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.