氯化锌预处理玉米秸秆纤维素

Cellulose of Corn Stover Pretreated with Zinc Chloride

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坏的预处理方法,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)分析表明,纤维素致密结构被破坏。最佳预处理工艺条件为:氯化锌质量分数87%、预处理温度139℃、预处理时间49 m in,在该条件预处理后1 g玉米秸秆纤维素溶解度最高达0.762 g。

The production of biological and chemical combination products and the generation of biomass energy with stovers as raw materials have become a global strategy for sustainable development.The choice of proper pretreatment methods is the key to improving the overall utilization level of stovers.In this study,corn stovers were pretreated by adopting the newly-developed technique of steam explosion to separate the components first.Then,zinc chloride solution was used to destruct the crystallinity of cellulose.Based on the single factor experiments,the effects of zinc chloride mass fraction,pretreatment time and temperature on the pretreatment 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 means of scanning electron microscope（SEM） and X-ray diffraction（XRD）.The optimum pretreatment parameters were as follows：zinc chloride mass fraction of 87%,pretreatment time of 49 min and pretreatment temperature of 139 ℃.Under the optimum conditions,the cellulose solubility of corn stover of 1 g was up to 0.762 g.