Journal
POLYMERS
Volume 10, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/polym10090967
Keywords
lignin purification; structural recognition; condensed lignin; S/G ratio
Categories
Funding
- National Natural Science Foundation of China [31170554, 31470604]
- Fundamental Research Funds for Dalian Polytechnic University [2016J001]
- Open Foundation of the State Key Laboratory of Pulp and Papermaking Engineering, South China University of Technology [201803]
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This study focused on the structural differences of lignin after pyridine-acetic acid-water (PAW) and dioxane-acidic water (DAW) purification processes. These structural differences included the S/G ratio, condensed structure, weight-average (M-W) molecular weights, beta-O-4 linkages and sugar content. The chemical structure of the isolated crude lignin (CL), PAW purified lignin (PPL) and DAW purified lignin (DPL) was elucidated using quantitative C-13 NMR, 2D-HSQC NMR spectra, thermogravimetric analysis (TGA), gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FTIR). The results showed that the PPL fractions contain fewer condensed structures, higher S/G ratios, more beta-O-4 linkages, higher average M-W and lower thermal degradation properties compared to the CL and DPL fractions. Furthermore, the PAW process was more selective in removing condensed units and enriching S-type lignin from CL compared to the DAW process. These results provide valuable information for understanding which purification process is more suitable to be applied for lignin.
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