Acetyl Groups in Typha capensis : Fate of Acetates during Organosolv and Ionosolv Pulping

• Published in: Polymers Vol. 10; no. 6; p. 619
• Main Authors: Audu, Idi Guga, Brosse, Nicolas, Winter, Heiko, Hoffmann, Anton, Bremer, Martina, Fischer, Steffen, Laborie, Marie-Pierre
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI 05-06-2018
• Subjects: Chemical and Process Engineering; Chemical Sciences; Engineering Sciences; Materials; Organic chemistry; Polymers; ethanol organosolv lignin; lignin; MWL; Typha capensis; native acetate; ionic liquid lignin
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym10060619

During biomass fractionation, any native acetylation of lignin and heteropolysaccharide may affect the process and the resulting lignin structure. In this study,
(TC) and its lignin isolated by milling (MWL), ionosolv (ILL) and organosolv (EOL) methods were investigated for acetyl group content using FT-Raman, ¹H NMR, 2D-NMR, back-titration, and Zemplén transesterification analytical methods. The study revealed that TC is a highly acetylated grass; extractive free TC (TC
) and TC MWL exhibited similar values of acetyl content: 6 wt % and 8 wt % by Zemplén transesterification, respectively, and 11 wt % by back-titration. In contrast, lignin extracted from organosolv and [EMIm][OAc] pulping lost 80% of the original acetyl groups. With a high acetyl content in the natural state, TC could be an interesting raw material in biorefinery in which acetic acid could become an important by-product.