Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 107, Issue -, Pages 426-435Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2017.09.012
Keywords
Biorefinery technical lignins; Alcoholic depolymerization; Mannich reaction
Funding
- Fundamental Research Funds for the Central Universities [2017JC13]
- National Natural Science Foundation of China [31500486, 31430092]
- Open Foundation of the State Key Laboratory of Pulp and Paper Engineering [201749]
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The alcoholic depolymerization and Mannich reaction were conducted to improve the chemical activity of biorefinery technical lignins and introduce amino groups into lignins, respectively. To understand the chemical structural transformations and examine the reaction mechanism, GPC and solution-state NMR techniques were performed. Element analysis was also used to quantify the amount of amine groups. The NMR characterization the depolymerized lignins indicated of the depolymerization, demethoxylation, and bond cleavage of linkages occurred during the depolymerization process. Results showed that the depolymerization temperature instead of the addition of capping reagents was the main factor for improving the reactivity of lignin under the given conditions. The Mannich reaction was very selective, primarily occurred at H-3,H-5 and G(5) positions, and the H units present a higher chemical reactivity. It is believed that the understanding of the fundamental chemistry of lignin during depolymerization and Mannich reaction process will contribute to the extension of high value-added applications of biorefinery lignin. (C) 2017 Elsevier B.V. All rights reserved.
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