木质素
玉米秸秆
过氧乙酸
纤维素
化学
纤维素乙醇
生物量(生态学)
木屑
木质纤维素生物量
制浆造纸工业
软木
干草
醋酸
石灰
亚氯酸钠
有机化学
水解
农学
材料科学
过氧化氢
二氧化氯
作物
冶金
生物
工程类
作者
Rajeev Kumar,Fan Hu,Christopher A. Hubbell,Arthur J. Ragauskas,Charles E. Wyman
标识
DOI:10.1016/j.biortech.2012.12.028
摘要
Two established delignification methods employing sodium chlorite–acetic acid (SC/AA) and peracetic acid (PAA) are often used, and are reportedly highly selective. However, these reports are mostly for highly recalcitrant and unpretreated softwoods and hardwoods species, and information for less recalcitrant lignocellulosic feedstocks and pretreated biomass is scarce. Furthermore, the effects on cellulose structure are not documented. Thus, in this study, delignification kinetics and selectivity were evaluated when SC/AA and PAA were applied to untreated switchgrass, poplar, corn stover, and pine sawdust; poplar subjected to AFEX, controlled pH, lime, and SO2 pretreatments; and the cellulose model compounds. Both methods proved effective in removing >90% lignin, but selectivity for lignin and carbohydrates removal was substrate and pretreatment dependent. For untreated biomass, PAA was more selective in removing lignin than SC/AA; however, both methods were less selective for pretreated solids. Cellulose characterizations revealed that PAA had less pronounced impacts on cellulose structure.
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