Microwave-assisted direct transformation of lignocellulose into methyl glycopyranoside in ionic liquid
Microwave-assisted direct transformation of lignocellulose into methyl glycopyranoside in ionic liquid
复制标题
DOI：
10.1515/hf-2019-0069
复制
发表时间：
2019-09
期刊：
影响因子：
2.4
通讯作者：
T. Kishimoto;Mafuyu Saito;Satoshi Suzuki;Masahiro Hamada;N. Nakajima;D. Urabe
中科院分区：
文献类型：
--
作者：
T. Kishimoto;Mafuyu Saito;Satoshi Suzuki;Masahiro Hamada;N. Nakajima;D. Urabe
摘要近年来，木质纤维素转化为有用物质的研究越来越受到人们的关注。在我们以前的研究中，微晶纤维素成功地转化为甲基吡喃葡萄糖苷（MeGlc）的离子液体（IL）和微波辐射在温和的反应条件下的组合使用。在这项研究中，木质纤维素，包括软木，硬木，和稻草，直接转化为甲基吡喃葡萄糖苷（MG），包括MeGlc，甲基吡喃甘露糖苷（MeMan），和甲基吡喃木糖苷（MeXyl），使用酸催化甲醇分解在微波辐射下的离子液体。木质纤维素球磨是提高MG得率的关键工艺。在优化的反应条件下，针叶木中MeGlc的摩尔产率达到40%，与微晶纤维素的摩尔产率相当。还以48%产率获得MeXyl。这些结果表明，球磨木质纤维素在IL中的溶解和微波辅助甲醇分解的组合是将木质纤维素转化为高附加值物质的有效方法。
Abstract Recently, conversion of lignocellulose into useful substances has attracted increasing attention. In our previous investigations, microcrystalline cellulose was successfully converted to methyl glucopyranosides (MeGlc) by the combined use of ionic liquid (IL) and microwave irradiation under moderate reaction conditions. In this study, lignocelluloses, including softwood, hardwood, and rice straw, were directly converted to methyl glycopyranosides (MG), including MeGlc, methyl mannopyranosides (MeMan), and methyl xylopyranosides (MeXyl) using acid-catalyzed methanolysis under microwave irradiation in ILs. Lignocellulose ball-milling was quite effective as a crucial process of increasing the yield of MG. Under the optimized reaction conditions, the molar yield of MeGlc reached 40% from softwood, which was a comparable yield from microcrystalline cellulose. MeXyl was also obtained in a 48% yield. These results showed that the combination of the dissolution of ball-milled lignocellulose in IL and the microwave-assisted methanolysis was an effective method of converting lignocellulose into a high-value-added substance.