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Selective Production of Organic Acids and Depolymerization of Lignin by Hydrothermal Oxidation with Diluted Hydrogen Peroxide

机译:用稀释过氧化氢水热氧化选择性生产木质素的有机酸和降解

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There has been a great interest in converting lignin into chemicals, but lignin is not used as feedstock for chemical production at present. Considering the rigid structure of lignin. we have developed a new method to recover chemicals from lignin under severe conditions. This method is the hydrothermal oxidative degradation using 0.1 % hydrogen peroxide solution in the flow reactor at 150-200 °C. When alkali lignin was oxidized for 2 min at 200 °C, the total yield of organic acids was as large as 0.45 g/g-lignin. The organic acids consisted of formic, acetic, and succinic acids, and the high-molecular-weight lignin also remained after the oxidation. On the other hand, when organosolv lignin was oxidized at 160 °C, lignin molecules were depolymerized into the oligomer of M_W = ca. 300 and the total yield of organic acids was 0.20 g/g-lignin. The product distribution depended on the difference in the structures between the two lignin samples. It was clarified that the proposed method is valid to produce valuable chemicals from any kind of lignin.
机译:对将木质素转化为化学品,但木质素目前未被用作化学生产的原料。考虑到木质素的刚性结构。我们开发了一种在严重条件下从木质素恢复化学品的新方法。该方法是在150-200℃下在流动反应器中使用0.1%过氧化氢溶液的水热氧化降解。当碱木质素在200℃下氧化2分钟时,有机酸的总收率大约0.45g / g-lignin。有机酸由甲酸,醋酸和琥珀酸组成,高分子量木质素也保持在氧化后。另一方面,当在160℃下氧化有机溶症木质素时,将木质素分子解聚在M_W = Ca的低聚物中。 300和有机酸的总收率为0.20g / g-lignin。产品分布取决于两种木质素样本之间的结构差异。澄清说,所提出的方法有效,以产生来自任何种类的木质素的有价值的化学品。

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