Solvent extraction as a means of preparing homogeneous lignin fractions

Jarmo Ropponen (Corresponding Author), Lea Räsänen, Stella Rovio, Taina Ohra-Aho, Tiina Liitiä, Hannu Mikkonen, Daniel Van De Pas, Tarja Tamminen

Research output: Contribution to journalArticleScientificpeer-review

39 Citations (Scopus)

Abstract

Sequential extraction method was applied to lignins from hardwood and softwood isolated by kraft and VTT organosolv processes. Solvent extraction was found to fractionate lignin according to the molecular weight: small molecular weight lignin is dissolved in the organic solvents and the lignin with higher molecular weight is enriched into the residue. Isolated acetone fractions of lignin are more homogeneous with narrow molecular weight distributions. Based on the 31P NMR results, both total hydroxyl content and the content of phenolic hydroxyl units are higher in the acetone fraction than in the residue. Pyrolysis-GC/MS of all lignins showed that p-hydroxy phenols are enriched to the residues. Preferential dissolution of syringyl type lignin in acetone was observed for hardwood kraft lignin, whereas the opposite behavior was seen for the hardwood organosolv lignin. Glass transition temperatures of all acetone soluble fractions were notably low compared to starting and residue lignins, which gives possibilities for future applications as a material with specific properties.
Original languageEnglish
Pages (from-to)543-549
Number of pages7
JournalHolzforschung
Volume65
Issue number4
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed
Event11th European Workshop on Lignocellulosics and Pulp, EWLP 2010 - Hamburg, Germany
Duration: 16 Aug 201019 Aug 2010
Conference number: 11

Fingerprint

Lignin
Solvent extraction
Acetone
Hardwoods
Molecular weight
Hydroxyl Radical
Softwoods
Phenols
Molecular weight distribution
Organic solvents
Dissolution
Pyrolysis
Nuclear magnetic resonance

Keywords

  • DSC
  • molecular weight distribution
  • pyrolysis-GC/MS
  • sequential solvent extraction
  • size-exlusion chromatography (SEC)
  • thermal behavior
  • 31P-NMR spectroscopy

Cite this

Ropponen, Jarmo ; Räsänen, Lea ; Rovio, Stella ; Ohra-Aho, Taina ; Liitiä, Tiina ; Mikkonen, Hannu ; Van De Pas, Daniel ; Tamminen, Tarja. / Solvent extraction as a means of preparing homogeneous lignin fractions. In: Holzforschung. 2011 ; Vol. 65, No. 4. pp. 543-549.
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abstract = "Sequential extraction method was applied to lignins from hardwood and softwood isolated by kraft and VTT organosolv processes. Solvent extraction was found to fractionate lignin according to the molecular weight: small molecular weight lignin is dissolved in the organic solvents and the lignin with higher molecular weight is enriched into the residue. Isolated acetone fractions of lignin are more homogeneous with narrow molecular weight distributions. Based on the 31P NMR results, both total hydroxyl content and the content of phenolic hydroxyl units are higher in the acetone fraction than in the residue. Pyrolysis-GC/MS of all lignins showed that p-hydroxy phenols are enriched to the residues. Preferential dissolution of syringyl type lignin in acetone was observed for hardwood kraft lignin, whereas the opposite behavior was seen for the hardwood organosolv lignin. Glass transition temperatures of all acetone soluble fractions were notably low compared to starting and residue lignins, which gives possibilities for future applications as a material with specific properties.",
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Solvent extraction as a means of preparing homogeneous lignin fractions. / Ropponen, Jarmo (Corresponding Author); Räsänen, Lea; Rovio, Stella; Ohra-Aho, Taina; Liitiä, Tiina; Mikkonen, Hannu; Van De Pas, Daniel; Tamminen, Tarja.

In: Holzforschung, Vol. 65, No. 4, 2011, p. 543-549.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Solvent extraction as a means of preparing homogeneous lignin fractions

AU - Ropponen, Jarmo

AU - Räsänen, Lea

AU - Rovio, Stella

AU - Ohra-Aho, Taina

AU - Liitiä, Tiina

AU - Mikkonen, Hannu

AU - Van De Pas, Daniel

AU - Tamminen, Tarja

PY - 2011

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AB - Sequential extraction method was applied to lignins from hardwood and softwood isolated by kraft and VTT organosolv processes. Solvent extraction was found to fractionate lignin according to the molecular weight: small molecular weight lignin is dissolved in the organic solvents and the lignin with higher molecular weight is enriched into the residue. Isolated acetone fractions of lignin are more homogeneous with narrow molecular weight distributions. Based on the 31P NMR results, both total hydroxyl content and the content of phenolic hydroxyl units are higher in the acetone fraction than in the residue. Pyrolysis-GC/MS of all lignins showed that p-hydroxy phenols are enriched to the residues. Preferential dissolution of syringyl type lignin in acetone was observed for hardwood kraft lignin, whereas the opposite behavior was seen for the hardwood organosolv lignin. Glass transition temperatures of all acetone soluble fractions were notably low compared to starting and residue lignins, which gives possibilities for future applications as a material with specific properties.

KW - DSC

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KW - sequential solvent extraction

KW - size-exlusion chromatography (SEC)

KW - thermal behavior

KW - 31P-NMR spectroscopy

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