Effect of the Various Delignification Methods on the Individual Lignin Pyrolysis Products

S.A. Pokryshkin; Yu.A. Sypalova; I.A. Grishanovich; A.Yu. Kozhevnikov

doi:10.18321/ectj1661

Authors

S.A. Pokryshkin Core Facility Center “Arktika”, Northern (Arctic) Federal University named after M.V. Lomonosov, Northern Dvina Emb., 17, Arkhangelsk, 163002, Russia
Yu.A. Sypalova Core Facility Center “Arktika”, Northern (Arctic) Federal University named after M.V. Lomonosov, Northern Dvina Emb., 17, Arkhangelsk, 163002, Russia
I.A. Grishanovich Core Facility Center “Arktika”, Northern (Arctic) Federal University named after M.V. Lomonosov, Northern Dvina Emb., 17, Arkhangelsk, 163002, Russia
A.Yu. Kozhevnikov Core Facility Center “Arktika”, Northern (Arctic) Federal University named after M.V. Lomonosov, Northern Dvina Emb., 17, Arkhangelsk, 163002, Russia

DOI:

https://doi.org/10.18321/ectj1661

Keywords:

Lignin, Monomeric composition, Thermal destruction, Py-GC/MS

Abstract

Pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) was used to analyze a series of the technical and near-native birch lignins. The main monomeric components of lignins and their ratios have been determined. The contribution of the main monomeric units (S/G/H) to the lignin macromolecule was evaluated. Structural fragments are shown, the content of which is significantly influenced by the delignification method. Using RDBE (ring double bond equivalents) vs Cn and van Krevelen diagrams allowed to comprehensively characterize the monomeric composition of lignin pyrolysis products. Differences in the structure of all lignins, depending on the method of delignification, were visualized using principal component analysis (PCA). Hierarchical cluster analysis (HCA) allowed to divide studied lignins into three distinct groups: low-modified/near-native (milled wood lignin); moderately modified (alkaline ethanol lignin, soda lignin); and highly modified (kraft lignin, hydrolysis lignin, dimethyl sulfoxide lignin). The application of Py-GC/MS combined with chemometric techniques provides detailed information on changes in the lignin structure, depending on the degree of severity of the delignification process.

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