State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Lin'an, Zhejiang 311300, PR China; Zhejiang Provincial Key Laboratory of Chemical Utilization of Forestry Biomass, Lin'an, Zhejiang 311300, PR China.
College of Forestry, Henan Agricultural University, Zhengzhou 450002, PR China.
Bioresour Technol. 2020 Jul;307:123237. doi: 10.1016/j.biortech.2020.123237. Epub 2020 Mar 23.
Deep eutectic solvent (DES) with protonic acid shows the great potential for biomass valorization. However, the acid corrosion and recycling are still severe challenges in biorefinery. Herein, a novel DES by coordinating FeCl in choline chloride/glycerol DES was designed for effective and recyclable pretreatment. As compared to DESs with FeCl, ZnCl, AlCl and CuCl, DES with FeCl approvingly retained most of cellulose in pretreated Hybrid Pennisetum (95.2%). Meanwhile, the cellulose saccharification significantly increased to 99.5%, which was six-fold higher than that of raw biomass. The excellent pretreatment performance was mainly attributed to the high removal of lignin (78.88 wt%) and hemicelluloses (93.63 wt%) under the synergistic effect of Lewis acid and proper hydrogen-bond interaction of DES with FeCl. Furthermore, almost all cellulose still can be converted into glucose after five recycling process. Overall, the process demonstrated designed pretreatment was great potential for the low-cost biorefinery and boost the biofuel development.
质子酸型深共熔溶剂在生物质增值方面显示出巨大的潜力。然而，在生物炼制厂中，酸腐蚀和回收仍然是严峻的挑战。在此，通过在氯化胆碱/甘油深共熔溶剂中配位 FeCl 设计了一种新型深共熔溶剂，用于有效且可回收的预处理。与含有 FeCl、ZnCl、AlCl 和 CuCl 的深共熔溶剂相比，含有 FeCl 的深共熔溶剂在预处理杂交狼尾草（95.2%）中令人满意地保留了大部分纤维素。同时，纤维素糖化率显著提高到 99.5%，是原始生物质的六倍。优异的预处理性能主要归因于路易斯酸的协同作用和深共熔溶剂与 FeCl 的适当氢键相互作用下，木质素（78.88 wt%）和半纤维素（93.63 wt%）的高去除率。此外，经过五次回收过程后，几乎所有纤维素仍能转化为葡萄糖。总的来说，该工艺显示出设计的预处理在低成本生物炼制厂中具有巨大的潜力，并推动了生物燃料的发展。
