Effects of process severity on the chemical structure of Miscanthus ethanol organosolv lignin

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• 作者：Rol ; El Hage ; Nicolas Brosse ; Poulomi Sannigrahi ; Arthur Ragauskas
• 关键词：Miscanthus &#xd7 ; giganteus ; Lignin ; Organosolv pre-treatment ; NMR spectroscopy ; FTIR spectroscopy ; SEC
• 刊名：Polymer Degradation and Stability
• 出版年：2010
• 出版时间：June 2010
• 年：2010
• 卷：95
• 期：6
• 页码：997-1003
• 全文大小：362 K

文摘

Ethanol organosolv lignin extracted from Miscanthus &#xd7; giganteus with differing levels of severity (1.75 < CS<2.8) were subjected to comprehensive structural characterization by ¹³C, ³¹P NMR, FTIR spectroscopy and gel permeation chromatography. The results were compared to those from milled wood lignin from the same feedstock. The results showed that an increase in the severity of the treatment enhanced the dehydration reactions on the side chain and the condensation of lignin, increased the concentration of phenol groups and decreased the molecular mass of lignin fragments. It appeared that for the experimental conditions generally employed the cleavage of α-aryl ether bonds is primarily reaction responsible for lignin depolymerization under the organosolv conditions examined.