Continuous catalytic depolymerisation and conversion of industrial kraft lignin into low-molecular-weight aromatics
(2018) In Biomass Conversion and Biorefinery 8(2). p.455-470- Abstract
- 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 °C, using NaOH/lignin weight ratio ≈ 1 with 5 wt% lignin solids loadings for residence times of 1, 2 and 4 min, respectively, with comprehensive characterisation of... (More)
- 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 °C, using NaOH/lignin weight ratio ≈ 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 °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 (~ 4 °C). (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/0a960e7c-77d6-4ec4-a635-b772750961ad
- author
- Abdelaziz, Omar
LU
; Li, Kena
LU
; Tunå, Per LU and Hulteberg, Christian LU
- organization
- publishing date
- 2018-06
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Biomass Conversion and Biorefinery
- volume
- 8
- issue
- 2
- pages
- 16 pages
- publisher
- Springer
- external identifiers
-
- scopus:85047193803
- ISSN
- 2190-6823
- DOI
- 10.1007/s13399-017-0294-2
- language
- English
- LU publication?
- yes
- id
- 0a960e7c-77d6-4ec4-a635-b772750961ad
- date added to LUP
- 2017-11-29 11:56:25
- date last changed
- 2023-04-08 03:16:05
@article{0a960e7c-77d6-4ec4-a635-b772750961ad, abstract = {{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 °C, using NaOH/lignin weight ratio ≈ 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 °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 (~ 4 °C).}}, author = {{Abdelaziz, Omar and Li, Kena and Tunå, Per and Hulteberg, Christian}}, issn = {{2190-6823}}, language = {{eng}}, number = {{2}}, pages = {{455--470}}, publisher = {{Springer}}, series = {{Biomass Conversion and Biorefinery}}, title = {{Continuous catalytic depolymerisation and conversion of industrial kraft lignin into low-molecular-weight aromatics}}, url = {{http://dx.doi.org/10.1007/s13399-017-0294-2}}, doi = {{10.1007/s13399-017-0294-2}}, volume = {{8}}, year = {{2018}}, }