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Unprecedented catalyst-free lignin dearomatization with hydrogen peroxide and dimethyl carbonate

机译:使用过氧化氢和碳酸二甲酯的前所未有的无催化剂木质素化脱落

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摘要

Lignin can be efficiently dearomatized and oxidized under catalyst-free conditions in dimethyl carbonate as solvent and hydrogen peroxide as oxidant at 20-80 degrees C. Based on H2O2 loadings, modified fibres with different aromatic content and sizes can be achieved (from 100% to 0% aromatics). At loadings > 0.2 mol H2O2 g lignin(-1) almost complete dearomatized lignin can be achieved, resulting in a pale oily gel. Analyses of the derivatives show increase in carbonylic bonds (FTIR) and oxygen (elemental analysis) and smaller size fibres (ESI-MS). Changes were also in-depth monitored by 2D H-1-C-13 HSQC NMR. Depending on a desired application (e. g. resins, additives, coatings, etc.), tailored dearomatized lignin fibres can be straightforwardly produced. Being a novel reaction with relatively high peroxide concentrations, experiments must be conducted under strong safety conditions to avoid possible explosions and other risks associated to peroxides and/or in situ formed derivatives.
机译:木质素可以在碳酸二甲酯中的催化剂条件下有效化和氧化,作为氧化剂和过氧化氢,作为20-80℃的氧化剂。基于H 2 O 2载荷,可以实现具有不同芳族含量和尺寸的改性纤维(从100%到 0%芳烃)。 在载荷> 0.2mol H 2 O 2 G木质素(-1)几乎完全完全熟石化木质素可以实现,导致浅油性凝胶。 衍生物的分析显示羰基键(FTIR)和氧气(元素分析)和较小尺寸纤维(ESI-MS)的增加。 通过2D H-1-C-13 HSQC NMR监测变化也深入。 取决于所需的应用(例如,树脂,添加剂,涂料等),量身定制的Dealomated木质素纤维可以直接产生。 作为一种具有相对较高的过氧化物浓度的新反应,实验必须在强烈的安全条件下进行,以避免可能与过氧化物和/或原位形成衍生物相关的可能爆炸和其他风险。

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