Rapid and simultaneous production of furfural and cellulose-rich residue from sugarcane bagasse using a pressurized phosphoric acid-acetone-water system
Rapid and simultaneous production of furfural and cellulose-rich residue from sugarcane bagasse using a pressurized phosphoric acid-acetone-water system
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DOI：
10.1016/j.cej.2017.10.089
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发表时间：
2018-02
影响因子：
15.1
通讯作者：
Qiong Wang;X. Zhuang;Wen Wang;Xuesong Tan;Qiang Yu;W. Qi;Zhenhong Yuan
中科院分区：
文献类型：
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作者：
Qiong Wang;X. Zhuang;Wen Wang;Xuesong Tan;Qiang Yu;W. Qi;Zhenhong Yuan
为了最大限度地减少半纤维素（或纤维素）在一锅酸/有机溶剂体系中由木质纤维素水解同时产生糠醛和5-羟甲基糠醛（或糠醛和乙酰丙酸）时的浪费，我们开发了一种新型加压磷酸-丙酮-水体系（PPAWS）以将半纤维素转化为具有高纤维素保留率的糠醛。在PPAWS（丙酮/水= 7：3，v/v）中，在150 °C和1.5 MPa氮气下，在短短5 min内同时实现了从甘蔗渣中的糠醛生产（产率45.8%）、脱木质素（木质素去除率89.8 wt%）和富含纤维素的残余物提取（留存率72.9 wt%，纯度92.5 wt%）。液体产物的气相色谱-质谱分析显示，压力显著抑制了羟醛缩合产物的产生，即，丙酮与糠醛缩合生成丙酮自缩合产物和4-（2-呋喃基）-3-丁烯-2-酮，并保留大量丙酮。此外，动力学分析表明，“木糖→糠醛→降解产物”戊糖水解路径发生在PPAWS中，并且“木糖→糠醛”步骤的速率常数显著增加，这与在没有额外压力的情况下进行的反应明显不同。糠醛降解实验证实，在反应初期，加压也会抑制糠醛的降解。PPAWS利用丙酮去除木质素和促进糠醛生产的益处，并且可以容易地集成到由呋喃和酮的羟醛缩合生产的先进喷气燃料中。
In order to minimize hemicellulose (or cellulose) waste upon the simultaneous production of furfural and 5-hydroxymethylfurfural (or furfural and levulinic acid) from the hydrolysis of lignocellulose in one-pot acid/organic solvent systems, we have developed a novel pressurized phosphoric acid-acetone-water system (PPAWS) to convert hemicellulose into furfural with a high retention of cellulose. In the PPAWS (acetone/water = 7:3,v/v) at 150 °C under 1.5 MPa nitrogen, furfural production (yield 45.8%), delignification (lignin removal rate 89.8 wt%), and cellulose-rich residue extraction (retention rate 72.9 wt%, purity 92.5 wt%) from sugarcane bagasse were achieved simultaneously in just 5 min. Gas chromatography–mass spectrometry analysis of the liquid products revealed that pressure significantly inhibits the generation of aldol condensation products, i.e., acetone self-condensation products and 4-(2-furyl)-3-buten-2-one from the condensation of acetone and furfural, and acetone was retained in large quantities. In addition, kinetic analysis revealed that the “xylose → furfural → degradation products” pentose-hydrolysis path occurs in the PPAWS and that the rate constant of the “xylose → furfural” step is significantly increased, which is a clear departure from the reaction conducted without additional pressure. Furfural degradation experiments confirmed that adding pressure also inhibits the degradation of furfural in the initial stage of the reaction. The PPAWS exploits the benefits of acetone for lignin removal and the promotion of furfural production, and can be easily integrated into advanced jet fuel production from the aldol condensation of furans and ketones.