超声波预处理下的稀酸-球磨系统降解桦木木屑

为研究木质纤维素水解技术,利用超声波结合稀酸球磨系统的方法降解桦木木屑.在pH=5的柠檬酸中处理36小时后,桦木木屑的还原性糖产率为130mg/g wood,主要的单糖组分为木糖、葡萄糖和甘露糖.利用X-射线衍射仪和紫外扫描仪对于球磨前后木屑的晶体结构和化学键变化进行表征,结果显示:稀酸球磨系统可以在常温常压下较好地水解木屑的木质纤维素.其中木质纤维素的结晶度明显降低,产生更多的不定形态纤维素,并且木质素部分被破坏,说明超声波预处理过程提高了纤维对化学试剂的可及性,促进木屑的糖化水解.

Ultrasonic-assisted Ball Milling Hydrolysis of Brich Wood with Dilute Citric Acid

Birch wood chips were treated in ultrasonic-assisted ball milling hydrolysis with dilute citric acid at room temperature and atmospheric pressure in order to develop an efficient conversion process for the production of fermentable sugars from woody biomasses using wet ball milling hydrolysis system. Wood lignocellulose was easily hydrolyzed during ballmilling treatment into reduced sugars with a total yield of 130 mg/g wood. The concentrations of several major substances in the hydrolyzate were discussed. Corresponding structure transformations before and after milling were analyzed by means of X-ray diffraction (XRD), and UV spectroscopy clearly indicated that this combined treatment could enhance the crystalline and chemical structure changes of wood lignocellulose during ball-milling.