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Using 2D NMR to characterize the structure of the low and high molecular weight fractions of bio-oil obtained from LignoBoost (TM) kraft lignin depolymerized in subcritical water

Cecilia Mattsson (Institutionen för kemi och kemiteknik, Skogsindustriell kemiteknik) ; Sven-Ingvar Andersson (Institutionen för kemi och kemiteknik, Skogsindustriell kemiteknik) ; Tallal Belkheiri (Institutionen för energi och miljö, Industriella energisystem och -tekniker ) ; Lars-Erik Åmand (Institutionen för energi och miljö, Industriella energisystem och -tekniker ) ; L. Olausson ; Lennart Vamling (Institutionen för kemi och kemiteknik, Skogsindustriell kemiteknik) ; Hans Theliander (Institutionen för kemi och kemiteknik, Skogsindustriell kemiteknik)
Biomass & Bioenergy (0961-9534). Vol. 95 (2016), p. 364-377.
[Artikel, refereegranskad vetenskaplig]

In this work a multilevel analysis approach have been used for characterization of LignoBoostTM kraft lignin and bio-oil produced from LignoBoostTM kraft lignin using a process based on subcritical water (350 degrees C, 25 MPa). LignoBoostTM kraft lignin and the different fractions of the bio-oil (light oil, heavy oil and suspended solids) was characterized with high field NMR (18.8 T, 2D(13)C, H-1-HSQC NMR and C-13-NMR), GPC, GC-MS and elemental composition to improve understanding of the subcritical process. By using high resolution 2D HSQC NMR it was possible determine the chemical structures both on low and high molecular weight fractions of the bio-oil. It was confirmed that the signals from the aliphatic lignin inter-unit linkages, i.e. beta-O-4', beta-beta', beta-1' and beta-5', had disappeared from all of the bio-oil fractions studied. This means that both the aliphatic carbon-oxygen (C-O) and to some extent carbon-carbon (C-C) bonds in LignoBoostTM kraft lignin have been cleaved and an effective depolymerization has occurred. However, re-polymerization into higher molecular weight (Mw) fractions takes place simultaneously. These higher Mw fractions (heavy oil and suspended solids) were found to be re-polymerized macromolecules, with new structural networks based on guaiacol/disubstituted aromatic ethers and polyaromatic hydrocarbon structures bound tightly together. (C) 2016 Elsevier Ltd. All rights reserved.

Nyckelord: Subcritical water, Base-catalyzed depolymerization (BCD), Phenol, Bio-oil, Char heteronuclear single, near-critical water, base-catalyzed depolymerization, hot-compressed, water, supercritical water, hydrothermal conversion, organosolv lignin, phenol mixtures, p-cresol, substituted phenols, chemical recovery, Agriculture, Biotechnology & Applied Microbiology, Energy & Fuels



Denna post skapades 2017-01-13. Senast ändrad 2017-03-21.
CPL Pubid: 246879

 

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