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首页> 外文期刊>Journal of Polymers and the Environment >Qualitative and Quantitative Analysis of Lignin Produced from Beech Wood by Different Conditions of the Organosolv Process
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Qualitative and Quantitative Analysis of Lignin Produced from Beech Wood by Different Conditions of the Organosolv Process

机译：不同溶剂工艺条件下山毛榉木中木质素的定性和定量分析

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摘要

Lignins in general have been extensively studied, while beech wood lignin in particular is rarely researched. In the present work, Organosolv isolated lignin from beech wood (OBL) has been characterized. The isolation was done by two methods: (a) by using sulfuric acid at 170 A degrees C and a reaction time of 120 min and (b) at a temperature of 180 A degrees C for 240 min. A range of analytical methods were applied including elemental analysis, FT-IR, UV-Vis, P-31 NMR, SEC, Pyrolysis-GC/MS and HPLC to gain information about establish the purity, structure, molecular weight, thermal behavior and to determine carbohydrate residues according to the NREL protocol. FT-IR and UV-Vis spectra of OBL revealed expected typical absorptions for lignins. NREL analysis presented a carbohydrate-free lignin fraction which has not been achieved to date. TGA and DSC are used to study the thermal behavior of the isolated lignins and showed a relatively low glass transition temperatures (T-g: 123 A degrees C) and decomposition temperatures of 348 and 381 A degrees C. The pyrograms generated from the pyrolysis-GC/MS at 550 A degrees C consisted mainly of fragments of syringyl, guaiacyl and hydroxyphenyl units, thereby confirming the results of the NMR analysis. Our findings support Organolsolv as an efficient method to isolate pure lignin fractions from beech wood with practical value in industry.
机译：木质素通常已被广泛研究，而山毛榉木质素很少被研究。在目前的工作中，已表征了从山毛榉木（OBL）中分离出的有机溶剂木质素。分离通过两种方法完成：（a）在170 A的温度下使用硫酸和120分钟的反应时间，（b）在180 A的温度下使用240分钟。应用了一系列分析方法，包括元素分析，FT-IR，UV-Vis，P-31 NMR，SEC，热解-GC / MS和HPLC，以获取有关建立纯度，结构，分子量，热行为和根据NREL协议确定碳水化合物残基。 OBL的FT-IR和UV-Vis光谱显示了木质素的预期典型吸收。 NREL分析显示了迄今为止尚未实现的不含碳水化合物的木质素部分。 TGA和DSC用于研究分离出的木质素的热行为，并显示出较低的玻璃化转变温度（Tg：123 A摄氏度）和分解温度分别为348和381 A摄氏度。热解-GC / 550 A℃的MS主要由丁香基，愈创木脂基和羟苯基单元的片段组成，从而证实了NMR分析的结果。我们的发现支持Organolsolv作为从山毛榉木材中分离纯木质素组分的有效方法，在工业上具有实用价值。

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  • 来源
    《Journal of Polymers and the Environment》 |2016年第2期|85-97|共13页
  • 作者

    Hansen B.; Kusch P.; Schulze M.; Kamm B.;

  • 作者单位

    Bonn Rhein Sieg Univ Appl Sci, Dept Appl Nat Sci, Von Liebig Str 20, D-53359 Rheinbach, Germany;

    Bonn Rhein Sieg Univ Appl Sci, Dept Appl Nat Sci, Von Liebig Str 20, D-53359 Rheinbach, Germany;

    Bonn Rhein Sieg Univ Appl Sci, Dept Appl Nat Sci, Von Liebig Str 20, D-53359 Rheinbach, Germany;

    Bonn Rhein Sieg Univ Appl Sci, Dept Appl Nat Sci, Von Liebig Str 20, D-53359 Rheinbach, Germany;

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  • 正文语种 eng
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  • 关键词

    Biomass; Lignin; Pyrolysis-GC/MS; Organosolv; P-31 NMR;

    机译：生物质;木质素;热解-GC / MS;有机溶剂;P-31 NMR;

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