氯化锌预处理玉米秸秆纤维素的研究

Study on Cellulose of Corn Stover by Zinc Chloride Pretreatment

摘要:

利用秸秆类原料生产生化组合产品、生物质能源等已形成世界性可持续发展战略。选择合适的预处理方法是提高秸秆综合利用水平的关键。本研究先采用新近发展的蒸汽爆破技术对玉米秸秆进行组分结合相分离，再用氯化锌溶液对汽爆后的物料进行纤维素结晶相破环的预处理方法，运用单因素实验和响应面法获取处理过程中的多因素组合的优化，包括氯化锌质量分数、预处理时间、预处理温度对玉米秸秆纤维素预处理效果的影响，建立并分析了各因素与处理后玉米秸秆纤维素溶解度的数学模型，处理后的物料经X射线衍射(XRD)和扫描电镜(SEM)表明纤维素致密结构被破坏。最佳溶解度条件为：氯化锌质量分数87%、预处理温度139℃、预处理时间49min。在最优处理条件下，处理后的1g玉米秸秆纤维素溶解度最高为0.762g。

Abstract:

Using the raw materials to produce biological and chemical combination production and biomass energy have become a global strategy for sustainable development. In this study, corn stover was pretreated by using the newly steam explosion to separate the components at first. Then zinc chloride solution was used to destruct the crystallinity of cellulose. Based on the single factor experiments, the effects of zinc chloride concentration, pretreatment time and temperature were investigated by response surface methodology. A mathematical model was established and analyzed to describe the relationships between the studied factors and the response of the cellulose solubility of corn stover. The structures of untreated/treated corn stalk were detected by Scanning Electron Microscope (SEM) and X-ray diffraction (XRD) .The optimum pretreatment parameters were as follows: zinc chloride concentration of 87%, pretreatment time of 49 min and pretreatment temperature for 139℃. Under the optimum conditions, cellulose solubility of corn stover of 1g was up to 0.762g.