Imidazole: Prospect Solvent for Lignocellulosic Biomass Fractionation and Delignification
Imidazole: Prospect Solvent for Lignocellulosic Biomass Fractionation and Delignification
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DOI：
10.1021/acssuschemeng.5b01600
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发表时间：
2016-03-01
影响因子：
8.4
通讯作者：
Bogel-Lukasik, Rafal
中科院分区：
文献类型：
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作者：
Morais, Ana Rita C.;Pinto, Joana Vaz;Bogel-Lukasik, Rafal
未来生物质衍生燃料、化学品和材料的广泛生产需要可持续原料的成本效益加工。使用咪唑作为生物质的溶剂创造了一种新的方法，有助于以绿色方式实现这一想法。本研究提出咪唑作为一种新的麦草预处理溶剂，可以从木质素解聚中生产富含纤维素和半纤维素的组分和附加值产品。研究了预处理的各种温度（110、140和170 ℃）和处理时间（1、2和4 h）。纤维素和半纤维素的回收率高度依赖于反应温度。在170 ℃下2 h获得了回收富含纤维素材料的最佳结果，达到62.4%w.w（-1），而天然小麦秸秆仅由38.8%w.w（-1）纤维素组成。对于相同的条件，在富含纤维素的材料中也获得了关于酶水解产率（99.3%w.w（-1）葡聚糖与葡萄糖产率）的最佳结果。由于富含纤维素的材料的形态和结构变化伴随着广泛的脱木素（高达92%），这一结果是可能获得的。采用毛细管电泳和高效液相色谱-质谱联用技术对回收的咪唑中的酚类化合物进行了分析，并对其中的香草醛和其他木质素类产物进行了鉴定。最后，通过III和C-13 NMR证实回收的咪唑的高纯度。
The future widespread production of biomass derived fuels, chemicals, and materials requires cost-effective processing of sustainable feedstock. The use of imidazole as a solvent for biomass creates a novel approach that helps to accomplish this idea in a green fashion. This work proposes imidazole as a novel solvent for wheat straw pretreatment, which allowed the production of cellulose- and hemicellulose-rich fractions and added-value products from depolymerization of lignin. Various temperatures (110, 140, and 170 degrees C) and processing times (1, 2, and 4 h) of pretreatment were investigated. Both cellulose and hemicellulose recovery were highly dependent on reaction temperature. The best result for the recovery of cellulose-rich material was obtained at 170 degrees C for 2 h, achieving 62.4% w.w(-1), whereas native wheat straw is composed by only 38.8% w.w(-1) cellulose. For the same conditions, optimal results were also obtained regarding the enzymatic hydrolysis yield (99.3% w.w(-1) glucan to glucose yield) in cellulose rich material. This result was possible to be obtained due to morphological and structural changes in cellulose-rich materials accompanied by extensive delignification (up to 92%). The presence of added-value phenolic compounds in recovered imidazole was analyzed by capillary electrophoresis and HPLC-MS. Vanillin and other lignin-based products were identified. Finally, the high purity of recovered imidazole was demonstrated by III and C-13 NMR.