Journal
BIOMASS CONVERSION AND BIOREFINERY
Volume 8, Issue 2, Pages 455-470Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s13399-017-0294-2
Keywords
Biorefineries; Lignin valorisation; Lignin depolymerisation; Biomass conversion; Continuous-flowreactor system; Renewable chemicals
Categories
Funding
- Swedish Foundation for Strategic Research (SSF) [RBP14-0052]
- Swedish Energy Agency [41288-1]
- Preem
- SunCarbon
- Sveaskog
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Base-catalysed depolymerisation of lignin using sodium hydroxide has been shown to be an effective approach towards exploiting industrial (technical) lignins within the pulp and paper industry. In the present work, a pine kraft lignin (Indulin AT) which is precipitated from black liquor of linerboard-grade pulp was depolymerised via base catalysis to produce low-molecular-mass aromatics without any organic solvent/capping agent in a continuous-flow reactor setup for the first time. The catalytic conversion of lignin was performed/screened at temperatures varying from 170 to 250 degrees C, using NaOH/lignin weight ratio ae 1 with 5 wt% lignin solids loadings for residence times of 1, 2 and 4 min, respectively, with comprehensive characterisation of substrate and produced reaction mixtures. The products were characterised using size exclusion chromatography (SEC), nuclear magnetic resonance spectroscopy (NMR) and supercritical fluid chromatography-diode array detector-tandem mass spectrometry (SFC-MS). The optimum operating conditions for such depolymerisation appeared to be at 240 degrees C and 30 h(-1), yielding the highest concentration of low-molecular-weight phenolics below the coking point. It was also found that the depolymerised lignin products exhibited better chemical stability during long-term storage at lower temperatures (similar to 4 degrees C).
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