超声波结合碱性H_2O_2法提取甘蔗渣综纤维素

Extraction of holocellulose from sugarcane bagasse using alkaline-H_2O_2 combined with ultrasonic

【目的】优化碱性H_2O_2结合超声波处理甘蔗渣的工艺,为甘蔗渣的进一步综合利用提供技术支持。【方法】利用碱性H_2O_2配合超声波对甘蔗渣进行处理,对影响处理后甘蔗渣中综纤维素及木质素含量的各因素进行单因素试验和响应面分析,确定最佳工艺条件。【结果】NaOH溶液质量浓度、H_2O_2体积分数和超声波处理时间3个因素,以及两因素间的交互作用对处理后甘蔗渣中综纤维素和木质素比值(H/L)均有极显著影响(P<0.01);碱性H_2O_2结合超声波处理甘蔗渣的最佳工艺条件:NaOH溶液质量浓度4.9%、H_2O_2体积分数3.8%、超声波处理时间2.1 h,在此条件下处理的甘蔗渣中H/L实际为10.01,与预测值(10.03)基本吻合,此时处理样品中木质素含量为9.03%、综纤维素含量为90.57%。【结论】响应面法优化的碱性H_2O_2结合超声波处理工艺可有效脱除甘蔗渣中木质素,较大程度保留综纤维素,可为甘蔗渣的进一步加工利用提供技术参考。

【Objective】Sugarcane bagasse processing technique by utilizing alkaline-H2O2combined with ultrasonic was optimized to provide reference for further utilization of sugarcane bagasse.【Method】Alkaline-H2O2was utilized togetherwith ultrasonic to process bagasse,and the factors effecting the contents of holocellulose and lignin in treated bagasse were analyzed using single factor experiments and response surface method.The optimal process conditions were determined.【Result】NaOHmass concentration,H2O2volume fraction,ultrasonic action time,and interaction between every two factors had extremely significant influence(P<0.01)on ratio of holocellulose to lignin(H/L)in sugarcane bagasse.The optimal sugarcane bagasse processing technique by utilizing alkaline-H2O2combined with ultrasonic was as follows:NaOH mass concentration4.9%,H2O2volume fraction3.8%,ultrasonic action time2.1h.Under these conditions,the actual H/L in sugarcane bagasse was10.01,coinciding with the predicted value(10.03).The content of lignin and holocellulose were9.03%and90.57%respectively.【Conclusion】The alkaline-H2O2process combined with ultrasonic optimized by response surface method can effectively remove lignin and maintain holocellulose to the greatest extent.This method can provide technical support for further development and utilization of sugarcane bagasse.