School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Bioresour Technol. 2017 Jun;234:406-414. doi: 10.1016/j.biortech.2017.03.081. Epub 2017 Mar 16.
It is urgent to develop recycled ionic liquids (ILs) as green solvents for sustainable biomass pretreatment. The goal of this study is to explore the availability and performance of reusing 1-allyl-3-methylimidazolium chloride ([amim]Cl) and 1-butyl-3-methylimidazolium acetate ([bmim]OAc) for pretreatment, structural evolution, and enzymatic hydrolysis of eucalyptus. Cellulose enzymatic digestibility slightly decreased with the increased number of pretreatment recycles. The hydrolysis efficiencies of eucalyptus pretreated via 4th recycled ILs were 54.3% for [amim]Cl and 72.8% for [bmim]OAc, which were 5.0 and 6.7-folds higher than that of untreated eucalyptus. Deteriorations of ILs were observed by the relatively lower sugar conversion and lignin removal from eucalyptus after 4th reuse. No appreciable changes in fundamental framework and thermal stability of [amim]Cl were observed even after successive pretreatments, whereas the anionic structure of [bmim]OAc was destroyed or replaced. This study suggested that the biomass pretreatment with recycled ILs was a potential alternative for low-cost biorefinery.
开发可回收离子液体 (ILs) 作为可持续生物质预处理的绿色溶剂迫在眉睫。本研究旨在探索重复使用 1-烯丙基-3-甲基咪唑氯化物 ([amim]Cl) 和 1-丁基-3-甲基咪唑乙酸盐 ([bmim]OAc) 进行预处理、结构演变和酶解桉树的可行性和性能。随着预处理循环次数的增加，纤维素的酶解消化率略有下降。经第 4 次循环 IL 预处理的桉树的水解效率分别为 [amim]Cl 的 54.3%和 [bmim]OAc 的 72.8%，分别是未经处理的桉树的 5.0 和 6.7 倍。第 4 次重复使用后，从桉树中提取的糖转化率和木质素去除率相对较低，表明 ILs 发生了降解。即使经过连续预处理，[amim]Cl 的基本结构和热稳定性也没有明显变化，而 [bmim]OAc 的阴离子结构被破坏或取代。本研究表明，使用回收 ILs 进行生物质预处理是低成本生物炼制的一种有前途的替代方法。
