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Investigating lignin-derived monomers and oligomers in low-molecular-weight fractions separated from depolymerized black liquor retentate by membrane filtration

Li, Kena LU orcid ; Prothmann, Jens LU ; Sandahl, Margareta LU ; Blomberg, Sara LU ; Turner, Charlotta LU and Hulteberg, Christian LU orcid (2021) In Molecules 26(10).
Abstract

Base-catalyzed depolymerization of black liquor retentate (BLR) from the kraft pulping process, followed by ultrafiltration, has been suggested as a means of obtaining low-molecular-weight (LMW) compounds. The chemical complexity of BLR, which consists of a mixture of softwood and hardwood lignin that has undergone several kinds of treatment, leads to a complex mixture of LMW compounds, making the separation of components for the formation of value-added chemicals more difficult. Identifying the phenolic compounds in the LMW fractions obtained under different depolymerization conditions is essential for the upgrading process. In this study, a state-of-the-art nontargeted analysis method using ultra-high-performance supercritical fluid... (More)

Base-catalyzed depolymerization of black liquor retentate (BLR) from the kraft pulping process, followed by ultrafiltration, has been suggested as a means of obtaining low-molecular-weight (LMW) compounds. The chemical complexity of BLR, which consists of a mixture of softwood and hardwood lignin that has undergone several kinds of treatment, leads to a complex mixture of LMW compounds, making the separation of components for the formation of value-added chemicals more difficult. Identifying the phenolic compounds in the LMW fractions obtained under different depolymerization conditions is essential for the upgrading process. In this study, a state-of-the-art nontargeted analysis method using ultra-high-performance supercritical fluid chromatography coupled to high-resolution multiple-stage tandem mass spectrometry (UHPSFC/HRMSn ) combined with a Kendrick mass defect-based classification model was applied to analyze the monomers and oligomers in the LMW fractions separated from BLR samples depolymerized at 170–210◦ C. The most common phenolic compound types were dimers, followed by monomers. A second round of depolymerization yielded low amounts of monomers and dimers, while a high number of trimers were formed, thought to be the result of repolymerization.

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author
; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Black liquor retentate, Depolymerization, Identification, Monomer, Oligomers
in
Molecules
volume
26
issue
10
article number
2887
publisher
MDPI AG
external identifiers
  • scopus:85106627895
  • pmid:34068097
ISSN
1420-3049
DOI
10.3390/molecules26102887
language
English
LU publication?
yes
id
860ed887-7652-4a81-b085-ec1c0933bd6f
date added to LUP
2021-06-09 10:26:49
date last changed
2024-04-06 04:42:57
@article{860ed887-7652-4a81-b085-ec1c0933bd6f,
  abstract     = {{<p>Base-catalyzed depolymerization of black liquor retentate (BLR) from the kraft pulping process, followed by ultrafiltration, has been suggested as a means of obtaining low-molecular-weight (LMW) compounds. The chemical complexity of BLR, which consists of a mixture of softwood and hardwood lignin that has undergone several kinds of treatment, leads to a complex mixture of LMW compounds, making the separation of components for the formation of value-added chemicals more difficult. Identifying the phenolic compounds in the LMW fractions obtained under different depolymerization conditions is essential for the upgrading process. In this study, a state-of-the-art nontargeted analysis method using ultra-high-performance supercritical fluid chromatography coupled to high-resolution multiple-stage tandem mass spectrometry (UHPSFC/HRMS<sup>n</sup> ) combined with a Kendrick mass defect-based classification model was applied to analyze the monomers and oligomers in the LMW fractions separated from BLR samples depolymerized at 170–210<sup>◦</sup> C. The most common phenolic compound types were dimers, followed by monomers. A second round of depolymerization yielded low amounts of monomers and dimers, while a high number of trimers were formed, thought to be the result of repolymerization.</p>}},
  author       = {{Li, Kena and Prothmann, Jens and Sandahl, Margareta and Blomberg, Sara and Turner, Charlotta and Hulteberg, Christian}},
  issn         = {{1420-3049}},
  keywords     = {{Black liquor retentate; Depolymerization; Identification; Monomer; Oligomers}},
  language     = {{eng}},
  number       = {{10}},
  publisher    = {{MDPI AG}},
  series       = {{Molecules}},
  title        = {{Investigating lignin-derived monomers and oligomers in low-molecular-weight fractions separated from depolymerized black liquor retentate by membrane filtration}},
  url          = {{http://dx.doi.org/10.3390/molecules26102887}},
  doi          = {{10.3390/molecules26102887}},
  volume       = {{26}},
  year         = {{2021}},
}