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首页> 外文期刊>Journal of Wood Chemistry and Technology >IMPROVED PROTOCOL FOR ALKALINE NITROBENZENE OXIDATION OF WOODY AND NON-WOODY BIOMASS
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IMPROVED PROTOCOL FOR ALKALINE NITROBENZENE OXIDATION OF WOODY AND NON-WOODY BIOMASS

机译：木质和非木质生物质碱性硝基苯氧化反应的改进方案

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摘要

The protocol of alkaline nitrobenzene oxidation was investigated to improve its ability to identify the different lignin structures for both woody and non-woody biomass. The survival factors of all six oxidation products-syringaldehde (Sr), vanillin (V), p-hydroxybenzaldehyde (B) and their corresponding acids, syringic acid (Sa), vanillic acid (Va), and p-hydroxybenzoic acid (Ba)-were studied at 170, 180, and 190 degrees C for several residence times. Under similar conditions, various lignin model compounds-a softwood (loblolly pine), a hardwood (red maple), and a non-wood raw material (corn stover)-were oxidized. Molar yields of oxidation products were determined and the ratios of (Sr+Sa)/(V+Va), (Sr/V), and B/(V+Va) (B/V) were calculated. All oxidation products were relatively stable at 170 and 180 degrees C but showed some degradation at 190 degrees C, especially at long residence time. In all cases, p-hydroxybenzoic acid was barely detectable. While yields of oxidation products reach a maximum at 170 degrees C for pine and maple, maximal yields of corn stover require 190 degrees C. Consequently, we recommend that nitrobenzene oxidation be carried out at 170 degrees C for 2.5 h for softwood and hardwood, but at 190 degrees C and 4 h with correction for the survival factors for corn stover and other non-woody biomass. Alternatively, a protocol of oxidation at two temperatures is recommended for non-woody biomass.
机译：研究了碱性硝基苯氧化的方案，以提高其识别木质和非木质生物量不同木质素结构的能力。六种氧化产物的丁香醛（Sr），香兰素（V），对羟基苯甲醛（B）及其相应酸，丁香酸（Sa），香草酸（Va）和对羟基苯甲酸（Ba）的存活因子-在170、180和190摄氏度下研究了几个停留时间。在相似的条件下，各种木质素模型化合物（软木（多叶松），硬木（红枫）和非木原料（玉米秸秆））被氧化。确定氧化产物的摩尔产率，并计算（Sr + Sa）/（V + Va），（Sr / V）和B /（V + Va）（B / V）的比率。所有氧化产物在170和180摄氏度下都相对稳定，但在190摄氏度下表现出一定程度的降解，尤其是在较长的停留时间下。在所有情况下，几乎都无法检测到对羟基苯甲酸。尽管松树和枫树的氧化产物的最大产量在170摄氏度时达到最高，玉米秸秆的最大产量需要190摄氏度。因此，我们建议软木和硬木在170摄氏度下进行硝基苯氧化2.5小时，但在190摄氏度和4小时内校正玉米秸秆和其他非木质生物量的存活因子。另外，对于非木质生物质，建议在两个温度下进行氧化。

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  • 来源
    《Journal of Wood Chemistry and Technology》 |2015年第3期|52-61|共10页
  • 作者

    Min Douyong; Xiang Zhouyang; Liu Jie; Jameel Hasan; Chiang Vincent; Jin Yongcan; Chang Hou-min;

  • 作者单位

    Nanjing Forestry Univ, Lignocellulose Chem & Utilizat Grp, Nanjing 210037, Jiangsu, Peoples R China|N Carolina State Univ, Dept Forest Biomat, Raleigh, NC 27695 USA;

    N Carolina State Univ, Dept Forest Biomat, Raleigh, NC 27695 USA;

    N Carolina State Univ, Dept Forestry, Forest Biotechnol Grp, Raleigh, NC 27695 USA;

    N Carolina State Univ, Dept Forest Biomat, Raleigh, NC 27695 USA;

    N Carolina State Univ, Dept Forestry, Forest Biotechnol Grp, Raleigh, NC 27695 USA;

    Nanjing Forestry Univ, Lignocellulose Chem & Utilizat Grp, Nanjing 210037, Jiangsu, Peoples R China;

    N Carolina State Univ, Dept Forest Biomat, Raleigh, NC 27695 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Nitrobenzene oxidation; survivival factors; lignin model compounds; Sr/V and B/V ratios;

    机译：硝基苯氧化;存活因子;木质素模型化合物;Sr / V和B / V比;

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