TY - JOUR
T1 - Structural characterization of birch lignin isolated from a pressurized hot water extraction and mild alkali pulped biorefinery process
AU - Lagerquist, Lucas
AU - Pranovich, Andrey
AU - Smeds, Annika
AU - von Schoultz, S.
AU - Vähäsalo, L.
AU - Rahkila, Jani
AU - Kilpeläinen, I.
AU - Tamminen, T.
AU - Willför, Stefan
AU - Eklund, Patrik Christoffer
N1 - 3pk
iok
PY - 2018
Y1 - 2018
N2 - In this work we have characterized a mild soda pulped birch (betula pendula) lignin after a novel pressurized hot water extraction pilot process. In the process hemicelluloses are first isolated from woods chips with hot water at oxygen-starved conditions, followed by mild alkali pulping at oxygen-starved conditions to remove lignin from the cellulose. Lignin was precipitated, washed and fractionated from the black liquor and characterized by quantitative C-13 NMR, C-13 DEPT experiments, P-31 NMR, 2D HSQC, FTIR, size exclusion chromatography (SEC), elemental analysis, pyrolysis-gas chromatography-mass spectrometry (py-GC-MS), methoxyl group quantification and residual carbohydrate analysis after methanolysis. The structure was compared to a MWL of birch obtained from the same wood chips and the differences were an increase in phenolic hydroxyl groups, carboxylic groups, polydispersity index, and reduction of aliphatic hydroxyl groups. The process resulted in beta-O-4 cleavage and condensation of the structure. This lignin is therefore suitable to be used in its polymeric form, rather than for degradation of the structure to small building blocks.
AB - In this work we have characterized a mild soda pulped birch (betula pendula) lignin after a novel pressurized hot water extraction pilot process. In the process hemicelluloses are first isolated from woods chips with hot water at oxygen-starved conditions, followed by mild alkali pulping at oxygen-starved conditions to remove lignin from the cellulose. Lignin was precipitated, washed and fractionated from the black liquor and characterized by quantitative C-13 NMR, C-13 DEPT experiments, P-31 NMR, 2D HSQC, FTIR, size exclusion chromatography (SEC), elemental analysis, pyrolysis-gas chromatography-mass spectrometry (py-GC-MS), methoxyl group quantification and residual carbohydrate analysis after methanolysis. The structure was compared to a MWL of birch obtained from the same wood chips and the differences were an increase in phenolic hydroxyl groups, carboxylic groups, polydispersity index, and reduction of aliphatic hydroxyl groups. The process resulted in beta-O-4 cleavage and condensation of the structure. This lignin is therefore suitable to be used in its polymeric form, rather than for degradation of the structure to small building blocks.
KW - lignin characterization
KW - Birch lignin
KW - Condensed structures
KW - Aryl glycerol
KW - Milled wood lignin
KW - lignin characterization
KW - Birch lignin
KW - Condensed structures
KW - Aryl glycerol
KW - Milled wood lignin
KW - lignin characterization
KW - Birch lignin
KW - Condensed structures
KW - Aryl glycerol
KW - Milled wood lignin
U2 - 10.1016/j.indcrop.2017.10.040
DO - 10.1016/j.indcrop.2017.10.040
M3 - Artikel
SN - 0926-6690
VL - 111
SP - 306
EP - 316
JO - Industrial Crops and Products
JF - Industrial Crops and Products
ER -