Qualitative and Quantitative Analysis of Lignin Produced from Beech Wood by Different Conditions of the Organosolv Process
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- 作者：B. Hansen ; P. Kusch ; M. Schulze ; B. Kamm
- 刊名：Journal of Polymers and the Environment
- 出版年：2016
- 出版时间：June 2016
- 年：2016
- 卷：24
- 期：2
- 页码：85-97
- 全文大小：1,394 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Polymer Sciences - 出版者：Springer Netherlands
- ISSN：1572-8900
- 卷排序：24
文摘
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 °C and a reaction time of 120 min and (b) at a temperature of 180 °C for 240 min. A range of analytical methods were applied including elemental analysis, FT-IR, UV–Vis, 31P 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 (Tg: 123 °C) and decomposition temperatures of 348 and 381 °C. The pyrograms generated from the pyrolysis–GC/MS at 550 °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.KeywordsBiomassLigninPyrolysis–GC/MSOrganosolv31P NMR