【摘要】 为充分提取竹黄废屑原料中的半纤维素组分,论文采用中心复合实验设计方法(Central composite design,CCD),以戊糖得率为评价指标,对竹黄稀酸预水解工艺进行了优化。结果表明,各因素的影响顺序为反应温度(X1)>硫酸浓度(X3)>反应时间(X2);固定固液比(w/v)为1∶10时,竹黄半纤维素最佳水解条件为水解温度120.5℃,水解时间2.32h,硫酸质量分数4.66%,在此条件下戊糖收率为78.67%,底物失重率为21.93%。通过验证实验表明,本研究方法对于竹黄半纤维素水解条件优化是可靠的。更多还原

【Abstract】 In this paper the pentose yield were chosen as response variable,central composite design( CCD) was applied to optimize the conditions of dilute sulfuric acid hydrolysis of bamboo sweeps hemicelluloses. The results showed that the influence order of the factors on the yield of pentose was reaction temperature( X),concentration of H2SO4( X3) and reaction time( X2); When the material and liquid ratio was 1∶ 10,the optimal hydrolysis conditions were reaction temperature 120. 5℃,reaction time 2. 32h and 4. 66% concentration of H2SO4. Under these reaction conditions,the pentose yield was 78. 67% and the weight-loss ratio was 21. 93%. It was showed that the model can be used to predict the hydrolysis condition of bamboo sweeps hemicelluloses.更多还原