Title
Structural characterization of lignin extracted with alkaline hydrogen peroxide from furfural residue
Authors
CHANG-ZHOU CHEN MING-FEI LI YU-YING WU and RUN-CANG SUN

Received August 6, 2013
Published Volume 49 Issue 2 February
Keywords furfural residue, lignin, alkaline hydrogen peroxide, Py-GC/MS

Abstract
structural features of lignins were characterized by elemental analysis, GPC, FT-IR, 1H NMR, 13C NMR and Py-GC/MS. Results showed that the yield of lignin increased with the increase of reaction time and temperature. The maximum lignin yield of 41.4% (corresponding to the original lignin) was achieved by extraction at 80 ºC for 3 h. The average-molecular weight (Mw) of the extracted lignins (780-850) was about 1/4 of that of the MWL (milled wood lignin) of furfural residue (2890), which indicated a severe degradation of furfural residue lignin under the treatment. Py-GC/MS analysis indicated that the major unit in lignins was p-hydroxycinnamyl (H), together with lower amounts of syringyl (S) and guaiacyl (G) units. The relative molar content of the H unit in the extracted lignins increased, as compared to MWL.