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
Artikel i vetenskaplig tidskrift, 2016

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.

hydrothermal conversion

near-critical water

Base-catalyzed depolymerization (BCD)

base-catalyzed depolymerization

Agriculture

hot-compressed

Energy & Fuels

Char heteronuclear single

Bio-oil

phenol mixtures

Phenol

substituted phenols

Subcritical water

p-cresol

organosolv lignin

chemical recovery

water

supercritical water

Biotechnology & Applied Microbiology

Författare

Cecilia Mattsson

Chalmers, Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Sven-Ingvar Andersson

Chalmers, Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Tallal Belkheiri

Chalmers, Energi och miljö, Industriella energisystem och -tekniker

Lars-Erik Åmand

Chalmers, Energi och miljö, Industriella energisystem och -tekniker

L. Olausson

Valmet AB

Lennart Vamling

Chalmers, Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Hans Theliander

Wallenberg Wood Science Center (WWSC)

Chalmers, Kemi och kemiteknik, Kemiteknik, Skogsindustriell kemiteknik

Biomass and Bioenergy

0961-9534 (ISSN)

Vol. 95 364-377

Ämneskategorier

Pappers-, massa- och fiberteknik

Polymerteknologi

DOI

10.1016/j.biombioe.2016.09.004

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Senast uppdaterat

2018-08-24