玉米芯蒸汽爆破处理的研究及响应曲面法优化  

Studies on Steam Explosion of Corncob and Its Optimization by Response Surface Methodology

作　　者：许丙磊 彭奇均 

机构地区：[1]江南大学化学与材料工程学院,江苏无锡214122

出　　处：《林产化学与工业》2010年第6期82-88,共7页Chemistry and Industry of Forest Products

基　　金："十一五"国家科技支撑计划资助(2006BAD05A07)

摘　　要：通过响应曲面法,研究了不同汽爆压力和维压时间对玉米芯半纤维素、纤维素和木质素降解率的影响,建立了降解率对汽爆压力和维压时间的3个模型方程。借助模型方程及SAS9.0统计软件,得到纤维素基本不降解的区域:汽爆压力<1.946MPa,维压时间<155.7 s;并找到了在该范围内,半纤维素具有最大降解率的工艺条件:汽爆压力1.6MPa,维压时间113 s。该工艺条件下,半纤维素降解率达44.8%,总糖产率42.3%,还原糖产率9.5%,木聚糖产率39.4%,木聚糖平均聚合度4.5,单糖总产率1.9%(主要为木糖),木质素降解率18.7%,所得实验结果与模型预测非常吻合,表明所建模型合理有效。The effects of steam explosion pressure and applied-pressure time on the degradation rate of hemi-cellulose,cellulose and lignin in corncob were studied by response surface methodology.Three model equations for steam explosion pressure and applied-pressure time on the degradation rate were built.Based on the three models and SAS 9.0 statistical software,the basic areas of cellulose without degradation were defined： to be under steam explosion pressure 1.946 MPa and applied-pressure time 155.7 s;and within this range,the condition for the greatest degradation rate of hemi-cellulose was found to be under steam explosion pressure 1.6 MPa,and applied-pressure time 113 s.Under this condition,the degradation rate of hemi-cellulose was 44.8 % with total sugar yield 42.3 %,reducing sugar yield 9.5 %,xylan yield 39.4 %,average degree of polymerization of xylan 4.5,simple sugar yield 1.9 %（mainly xylose）,and the degradation rate of lignin was 18.7 %.The result is in good agreement with the model prediction,indicating that the model is reasonable and effective.

关 键 词：玉米芯 蒸汽爆破法 半纤维素 响应曲面法 

分 类 号：TQ351.0[化学工程]