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采用稀HCl和HNO3在酸质量分数为1.0%、2.5%和4.0%,反应时间10、30、50、90和120min,温度90和150℃条件下,对玉米芯水解产木糖进行研究。通过动力学模型数据预测木糖浓度,并采用响应曲面优化各个温度下的水解条件。优化得到的最适宜水解条件为温度150℃,预处理时间10 min,酸质量分数为1.0%;对应HNO3得到的木糖浓度为56.77 g/L,产率96.31%;HCl木糖浓度为45.38 g/L,产率76.99%。动力学结果成功预测了反应条件下的木糖浓度。通过对比得出HNO3对玉米芯的水解效果要优于HCl。
The hydrolyzed xylose from corncob was studied by dilute HCl and HNO3 at the acid concentration of 1.0%, 2.5% and 4.0%, the reaction time of 10, 30, 50, 90 and 120min, the temperature of 90 and 150 ℃. Xylose concentration was predicted from the kinetic model data and the response surface was used to optimize the hydrolysis conditions at each temperature. The optimal hydrolysis conditions were as follows: temperature 150 ℃, pretreatment time 10 min, acid mass fraction 1.0%; corresponding HNO3 obtained xylose concentration 56.77 g / L, yield 96.31%; HCl xylose concentration 45.38 g / L, yield 76.99%. Kinetic results successfully predict the xylose concentration under the reaction conditions. By comparison, HNO3 hydrolyzed corn cob better than HCl.