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Issue 14, 2020
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Two-step conversion of Kraft lignin to nylon precursors under mild conditions

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Abstract

This study explores the valorization of Kraft lignin by conversion into nylon precursors in a two-step process. First, lignin was depolymerized in dilute alkaline aqueous solution under atmospheric N2 at 200 °C to give guaiacol with high selectivity (>80%) with a total monomer production of 13% based on lignin input. Solution and solid state NMR analyses and reactions of model compounds indicated that depolymerization took place via cleavage of β-O-4 bonds in lignin. In the second step, lignin-derived guaiacol was selectively converted to the nylon precursors cyclohexanol/cyclohexanone (KA oil) using Ru/C catalyst under 1 bar H2 and 150 °C. This two-step process constitutes a low-temperature and low-pressure pathway for producing value-added chemicals from lignin using water as the reaction solvent.

Graphical abstract: Two-step conversion of Kraft lignin to nylon precursors under mild conditions

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Supplementary files

Article information


Submitted
06 Apr 2020
Accepted
27 Jun 2020
First published
29 Jun 2020

This article is Open Access

Green Chem., 2020,22, 4676-4682
Article type
Paper

Two-step conversion of Kraft lignin to nylon precursors under mild conditions

H. Zhou, H. Wang, F. A. Perras, P. Naik, M. Pruski, A. D. Sadow and I. I. Slowing, Green Chem., 2020, 22, 4676
DOI: 10.1039/D0GC01220C

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