在有机酸中，通过高效的有机溶剂法将玉米秸秆分离成纤维素和木质素。
Highly efficient organosolv fractionation of cornstalk into cellulose and lignin in organic acids.
机构信息
Institute for Chemicals and Fuels from Alternative Resources, Department of Chemical and Biochemical Engineering, Western University, London, Ontario N6A 5B9, Canada.
Department of Mechanical and Materials Engineering, Western University, London, Ontario N6A 5B9, Canada.
出版信息
Bioresour Technol. 2016 Oct;218:953-61. doi: 10.1016/j.biortech.2016.07.054. Epub 2016 Jul 14.
In this study, effects of fractionation solvents, catalysts, temperatures and residence time on yields, purity and chemical composition of the products were investigated at the solid/solvent ratio of 1:5 (g/g). It was revealed that mixture of acetic acid/formic acid/water at the ratio of 3:6:1 (v/v/v) resulted in crude cellulose and lignin products of relatively high purity. The use of HCl catalyst contributed to a high crude cellulose yield, while H2SO4 showed an adverse effect on cellulose yield. However, both of these acidic catalysts contributed to much lower hemicellulose contents in the resulted crude cellulose products compared with those obtained without a catalyst. Fractionation at 90°C for 180min in mixed solvents of acetic acid/formic acid/water (3:6:1, v/v/v) with or without catalyst produced crude cellulose with very low residual lignin contents (<4%).
在这项研究中，在固液比为 1:5（g/g）的条件下，考察了分馏溶剂、催化剂、温度和停留时间对产物收率、纯度和化学成分的影响。结果表明，乙酸/甲酸/水的比例为 3:6:1（v/v/v）的混合物产生了相对高纯度的粗纤维素和木质素产物。使用 HCl 催化剂有助于提高粗纤维素的收率，而 H2SO4 对纤维素的收率则有不利影响。然而，与没有催化剂时相比，这两种酸性催化剂都导致得到的粗纤维素产物中的半纤维素含量明显降低。在有或没有催化剂的情况下，在乙酸/甲酸/水（3:6:1，v/v/v）混合溶剂中于 90°C 下分馏 180min 可得到残余木质素含量非常低（<4%）的粗纤维素。
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