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Aqueous Choline Chloride: A Novel Solvent for Switchgrass Fractionation and Subsequent Hemicellulose Conversion into Furfural
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-04-10 00:00:00 , DOI: 10.1021/acssuschemeng.8b00728 Zhu Chen 1 , Wesley D. Reznicek 1 , Caixia Wan 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-04-10 00:00:00 , DOI: 10.1021/acssuschemeng.8b00728 Zhu Chen 1 , Wesley D. Reznicek 1 , Caixia Wan 1
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The performance of aqueous choline chloride (ChCl) solution on switchgrass fractionation and further utilization was evaluated. Under a relatively mild pretreatment condition (120 °C, 25 min), acidified ChCl solution efficiently removed 76% xylan and 51% lignin from switchgrass. The solvent was recycled and reused with similar performance for at least four pretreatment cycles when an acidic condition was maintained. The solvent recycling and reuse led to an increase in cumulative lignin yield with increased pretreatment cycles, reaching 93% at the fifth cycle. Two-dimensional heteronuclear single quantum coherence (HSQC) NMR analysis revealed that lignin recovered from the fifth cycle had a similar β-O-4 linkage abundance to native lignin. Such lignin would be well-suited for aromatic monomer production via depolymerization. The solvent recycling also resulted in xylose-rich pretreatment liquor, which was a good substrate and reaction medium for furfural production. The pretreated switchgrass showed good cellulose digestibility which was 5-fold that of the untreated one. This work demonstrated that ChCl solution was a new and green solvent for fractionating lignocellulose complex and extracting lignin as well as upgrading hemicellulose-derived stream.
中文翻译：
氯化胆碱水溶液：柳枝Fra分级分离和随后将半纤维素转化为糠醛的新型溶剂
评估了氯化胆碱（ChCl）水溶液对柳枝fraction分馏和进一步利用的性能。在相对温和的预处理条件下（120°C，25分钟），酸化的ChCl溶液有效地从柳枝switch中去除了76％的木聚糖和51％的木质素。当保持酸性条件时，溶剂被循环使用并以相似的性能重复使用至少四个预处理周期。溶剂的回收和再利用导致随着预处理周期的增加，木质素的累积产量增加，在第五个周期达到93％。二维异核单量子相干（HSQC）NMR分析表明，从第五个循环中回收的木质素具有与天然木质素相似的β-O-4键合丰度。这种木质素将非常适合通过解聚生产芳族单体。溶剂的再循环还产生了富含木糖的预处理液，这是制备糠醛的良好底物和反应介质。预处理的柳枝showed显示出良好的纤维素消化率，是未处理柳枝5-的5倍。这项工作表明，ChCl溶液是一种新的绿色溶剂，用于分离木质纤维素复合物，提取木质素以及提高半纤维素来源的物流。
更新日期：2018-04-10
中文翻译：
氯化胆碱水溶液：柳枝Fra分级分离和随后将半纤维素转化为糠醛的新型溶剂
评估了氯化胆碱（ChCl）水溶液对柳枝fraction分馏和进一步利用的性能。在相对温和的预处理条件下（120°C，25分钟），酸化的ChCl溶液有效地从柳枝switch中去除了76％的木聚糖和51％的木质素。当保持酸性条件时，溶剂被循环使用并以相似的性能重复使用至少四个预处理周期。溶剂的回收和再利用导致随着预处理周期的增加，木质素的累积产量增加，在第五个周期达到93％。二维异核单量子相干（HSQC）NMR分析表明，从第五个循环中回收的木质素具有与天然木质素相似的β-O-4键合丰度。这种木质素将非常适合通过解聚生产芳族单体。溶剂的再循环还产生了富含木糖的预处理液，这是制备糠醛的良好底物和反应介质。预处理的柳枝showed显示出良好的纤维素消化率，是未处理柳枝5-的5倍。这项工作表明，ChCl溶液是一种新的绿色溶剂，用于分离木质纤维素复合物，提取木质素以及提高半纤维素来源的物流。
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