One-pot selective conversion of lignocellulosic biomass into furfural and co-products using aqueous choline chloride/methyl isobutyl ketone biphasic solvent system
One-pot selective conversion of lignocellulosic biomass into furfural and co-products using aqueous choline chloride/methyl isobutyl ketone biphasic solvent system
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DOI：
10.1016/j.biortech.2019.121708
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发表时间：
2019-10-01
影响因子：
11.4
通讯作者：
Wan, Caixia
中科院分区：
文献类型：
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作者：
Chen, Zhu;Bai, Xianglan;Wan, Caixia
本研究采用氯化胆碱/甲基异丁基酮（ChCl/MIBK）两相溶剂体系，在一锅法反应中同时进行木质纤维素的分离和转化。在优化条件下（170 ℃，60 min，0.6wt%H2SO4，10.7wt%固含量），双相溶剂可使柳枝稷中96%的木聚糖溶解，同时转化为糠醛，收率为84.04%。双相溶剂还能够选择性地提取具有高纯度（93.1%）和未缩合部分（即，Hibbert酮），以及降低的分子量和多分散指数。得到的纸浆富含纤维素（73.3%），它可以完全水解成葡萄糖在48小时内通过酶水解。含水氯成功地回收和重复使用至少三个周期具有类似的性能柳枝稷分馏。本研究表明，水相ChCl/MIBK两相体系是一种有效的溶剂系统，用于联产糠醛，高品质的工业木质素和可消化纤维素的进一步升级。
This study investigated simultaneous lignocellulose fractionation and conversion in a one-pot reaction using an aqueous choline chloride/methyl isobutyl ketone (ChCl/MIBK) biphasic solvent system. Under the optimized condition (170 degrees C, 60 min, 0.6 wt% H2SO4, 10.7 wt% solid loading), the biphasic solvent solubilized 96% xylan in raw switchgrass, which was simultaneously converted to furfural with a yield of 84.04%. The biphasic solvent was also able to selectively extract lignin, which had a high purity (93.1%), and uncondensed moieties (i.e., Hibbert's ketone), as well as decreased molecular weight and polydispersity index. The resultant pulp was enriched with cellulose (73.3%), which can be completely hydrolyzed into glucose within 48 h via enzymatic hydrolysis. Aqueous ChCl was successfully recycled and reused for atleast three cycles with similar performance in switchgrass fractionation. This study demonstrated that aqueous ChCl/MIBK biphasic system was an effective solvent system for co-production of furfural, high quality technical lignin and digestible cellulose for further upgrading.