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首页> 美国卫生研究院文献>Molecules >Sustainable Process for the Depolymerization/Oxidation of Softwood and Hardwood Kraft Lignins Using Hydrogen Peroxide under Ambient Conditions
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Sustainable Process for the Depolymerization/Oxidation of Softwood and Hardwood Kraft Lignins Using Hydrogen Peroxide under Ambient Conditions

机译：在环境条件下使用过氧化氢对软木和硬木牛皮纸木质素进行解聚/氧化的可持续工艺

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摘要

The present study demonstrated a sustainable and cost-effective approach to depolymerize/oxidize softwood (SW) and hardwood (HW) kraft lignins using concentrated hydrogen peroxide at temperatures ranging from 25 to 35 °C, in the absence of catalysts or organic solvents. The degree of lignin depolymerization could be simply controlled by reaction time, and no further separation process was needed at the completion of the treatment. The obtained depolymerized lignin products were comprehensively characterized by GPC–UV, FTIR, P-NMR, TGA, Py-GC/MS and elemental analysis. The weight-average molecular weights (M ) of the depolymerized lignins obtained from SW or HW lignin at a lignin/H O mass ratio of 1:1 after treatment for 120 h at room temperature (≈25 °C) were approximately 1420 Da. The contents of carboxylic acid groups in the obtained depolymerized lignins were found to significantly increase compared with those of the untreated raw lignins. Moreover, the depolymerized lignin products had lower thermal decomposition temperatures than those of the raw lignins, as expected, owing to the greatly reduced M . These findings represent a novel solution to lignin depolymerization for the production of chemicals that can be utilized as a bio-substitute for petroleum-based polyols in polyurethane production.
机译：本研究证明了在不使用催化剂或有机溶剂的情况下，使用浓过氧化氢在25至35°C的温度范围内对软木（SW）和硬木（HW）牛皮纸木质素进行解聚/氧化的可持续且具有成本效益的方法。木质素解聚的程度可以通过反应时间简单地控制，并且在处理完成时不需要进一步的分离过程。通过GPC-UV，FTIR，P-NMR，TGA，Py-GC / MS和元素分析对获得的解聚木质素产物进行了全面表征。在室温（≈25°C）下处理120 h后，以SW / HW木质素/ H O质量比为1：1的比例从SW或HW木质素得到的解聚木质素的重均分子量（M）约为1420 Da。发现与未处理的原始木质素相比，所获得的解聚木质素中的羧酸基团的含量显着增加。而且，正如所预期的那样，由于M大大降低，因此解聚的木质素产品的热分解温度比原始木质素的热分解温度低。这些发现代表了木质素解聚以生产化学品的新方法，该化学品可以用作聚氨酯生产中石油基多元醇的生物替代品。

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