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

作者：Audu Idi Guga; Brosse Nicolas; Winter Heiko; Hoffmann Anton; Bremer Martina; Fischer Steffen; Laborie Marie Pierre

来源：Polymers, 2018, 10(6): 619.

DOI：10.3390/polym10060619

• Typha capensis
• native acetate
• lignin
• MWL
• ionic liquid lignin
• ethanol organosolv lignin

During biomass fractionation, any native acetylation of lignin and heteropolysaccharide may affect the process and the resulting lignin structure. In this study, Typha capensis (TC) and its lignin isolated by milling (MWL), ionosolv (ILL) and organosolv (EOL) methods were investigated for acetyl group content using FT-Raman, H-1 NMR, 2D-NMR, back-titration, and Zemplen transesterification analytical methods. The study revealed that TC is a highly acetylated grass; extractive free TC (TCextr) and TC MWL exhibited similar values of acetyl content: 6 wt % and 8 wt % by Zemplen 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.

• 出版日期2018-6