摘要
探究了热水预水解对杨木组分、微观结构的影响及预水解液中降解产物含量变化的规律。结果表明,在保温时间60 min、保温温度155~175℃以及在保温时间0~120 min、保温温度170℃的条件下,随保温温度的升高或时间的延长,杨木热水预水解后的得率、聚戊糖和Klason木素的相对含量整体减少,纤维素的相对含量和结晶度有所增加;杨木热水预水解后的纤维形貌发生变化,出现不规则碎片和孔洞;预水解液中的酸溶木素含量增加,甲酸、乙酸、糠醛和5-羟甲基糠醛的浓度增加,糖含量随保温温度的升高不断增加,但随保温时间的延长呈先增加后减少的趋势。
The effect of hot water pre-hydrolysis on the composition and microstructure of poplar wood and its relationship with the contents of degradation products in hydrolyzate were investigated.Experiments showed that pre-hydrolysisat a temperature of 155～175℃for 60 min and at 170℃for 0～120 min,the yield of poplar wood chips after hydrolysis,the relative content of pentosan and Klason lignin in hydrolysate decreased as a whole,and the relative content and crystallinity of cellulose increased with the increase of temperature or the prolongation of time.Hydrolyzed fiber morphology was changed,appearing irregular fragments and holes.The content of acid-soluble lignin in the hydrolyzate increased,the concentration of formic acid,acetic acid,furfural and 5-hydroxymethylfurfural(5-hmf)increased.The content of sugar increased with the increase of temperature,but it increased first and then decreased with the increase of the time keeping at the maximum temperature.
作者
袁素娟
吉兴香
田中建
马浩
陈嘉川
杨桂花
YUAN Su-juan;JI Xing-xiang;TIAN Zhong-jian;MA Hao;CHEN Jia-chuan;YANG Gui-hua(State Key Lab of Bio-based Materials and Green Papermaking/Key Lab of Pulp&Paper Science and Technology of Education Ministry of China,Qilu University of Technology(Shandong Academy of Sciences),Ji nan,Shangdong Province,250353)
出处
《中国造纸》
CAS
北大核心
2018年第9期17-22,共6页
China Pulp & Paper
基金
国家重点研发计划(2017YFB0307900)
国家自然科学基金资助项目(31670590
31670595)
