Carbohydrate-free and highly soluble softwood kraft lignin fractions by aqueous acetone evaporation fractionation

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

Technical lignins are complex mixtures of polymers with molecules of different molar masses, number of functional groups and carbohydrate residues. This heterogeneity induces variance in lignin properties and thus limits lignin's applicability in products where constant quality is required. Lignin fractionation into more homogeneous fractions is an attractive approach to valorize lignin feedstock. In this paper, solvent fractionation of lignin was applied to produce lignin fractions with improved purity and homogeneity. The main lignin fraction consisted 86% of the original lignin feedstock and this fraction was practically free from carbohydrates. In addition, a lignin fraction with very low molar mass, high solubility, high number of reactive free phenolic hydroxyl groups and a low glass transition temperature, was produced. The water solubility of lignin fractions depended not only on the molar mass and functional groups, but also on carbohydrates bound to lignin. The molecules with the highest solubility were most likely covalently linked to arabinogalactan. The applied aqueous acetone fractionation method with solvent evaporation required significantly less solvents than precipitation fractionation processes with nonsolvent addition and therefore is considered technically, economically and environmentally more sound process than alternative methods.

Original languageEnglish
Pages (from-to)483-490
Number of pages8
JournalNordic Pulp and Paper Research Journal
Volume32
Issue number4
Publication statusPublished - 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Softwoods
Lignin
softwood
Carbohydrates
Fractionation
Acetone
acetone
lignin
evaporation
carbohydrate
fractionation
Evaporation
carbohydrates
water
Molar mass
solubility
Solubility
molecular weight
feedstocks
Feedstocks

Keywords

  • softwood kraft lignin
  • lignin structure
  • aqueous solvent fractionation
  • evaporation fractionation
  • molar mass
  • carbohydrates
  • glass transition temperature

Cite this

@article{432825f1b76941dcaf2c6691419c2037,
title = "Carbohydrate-free and highly soluble softwood kraft lignin fractions by aqueous acetone evaporation fractionation",
abstract = "Technical lignins are complex mixtures of polymers with molecules of different molar masses, number of functional groups and carbohydrate residues. This heterogeneity induces variance in lignin properties and thus limits lignin's applicability in products where constant quality is required. Lignin fractionation into more homogeneous fractions is an attractive approach to valorize lignin feedstock. In this paper, solvent fractionation of lignin was applied to produce lignin fractions with improved purity and homogeneity. The main lignin fraction consisted 86{\%} of the original lignin feedstock and this fraction was practically free from carbohydrates. In addition, a lignin fraction with very low molar mass, high solubility, high number of reactive free phenolic hydroxyl groups and a low glass transition temperature, was produced. The water solubility of lignin fractions depended not only on the molar mass and functional groups, but also on carbohydrates bound to lignin. The molecules with the highest solubility were most likely covalently linked to arabinogalactan. The applied aqueous acetone fractionation method with solvent evaporation required significantly less solvents than precipitation fractionation processes with nonsolvent addition and therefore is considered technically, economically and environmentally more sound process than alternative methods.",
keywords = "softwood kraft lignin, lignin structure, aqueous solvent fractionation, evaporation fractionation, molar mass, carbohydrates, glass transition temperature",
author = "Anna-Stina J{\"a}{\"a}skel{\"a}inen and Pia Willberg-Keyril{\"a}inen and Tiina Liiti{\"a} and Tarja Tamminen",
year = "2017",
language = "English",
volume = "32",
pages = "483--490",
journal = "Nordic Pulp and Paper Research Journal",
issn = "0283-2631",
publisher = "De Gruyter",
number = "4",

}

Carbohydrate-free and highly soluble softwood kraft lignin fractions by aqueous acetone evaporation fractionation. / Jääskeläinen, Anna-Stina; Willberg-Keyriläinen, Pia; Liitiä, Tiina; Tamminen, Tarja.

In: Nordic Pulp and Paper Research Journal, Vol. 32, No. 4, 2017, p. 483-490.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Carbohydrate-free and highly soluble softwood kraft lignin fractions by aqueous acetone evaporation fractionation

AU - Jääskeläinen, Anna-Stina

AU - Willberg-Keyriläinen, Pia

AU - Liitiä, Tiina

AU - Tamminen, Tarja

PY - 2017

Y1 - 2017

N2 - Technical lignins are complex mixtures of polymers with molecules of different molar masses, number of functional groups and carbohydrate residues. This heterogeneity induces variance in lignin properties and thus limits lignin's applicability in products where constant quality is required. Lignin fractionation into more homogeneous fractions is an attractive approach to valorize lignin feedstock. In this paper, solvent fractionation of lignin was applied to produce lignin fractions with improved purity and homogeneity. The main lignin fraction consisted 86% of the original lignin feedstock and this fraction was practically free from carbohydrates. In addition, a lignin fraction with very low molar mass, high solubility, high number of reactive free phenolic hydroxyl groups and a low glass transition temperature, was produced. The water solubility of lignin fractions depended not only on the molar mass and functional groups, but also on carbohydrates bound to lignin. The molecules with the highest solubility were most likely covalently linked to arabinogalactan. The applied aqueous acetone fractionation method with solvent evaporation required significantly less solvents than precipitation fractionation processes with nonsolvent addition and therefore is considered technically, economically and environmentally more sound process than alternative methods.

AB - Technical lignins are complex mixtures of polymers with molecules of different molar masses, number of functional groups and carbohydrate residues. This heterogeneity induces variance in lignin properties and thus limits lignin's applicability in products where constant quality is required. Lignin fractionation into more homogeneous fractions is an attractive approach to valorize lignin feedstock. In this paper, solvent fractionation of lignin was applied to produce lignin fractions with improved purity and homogeneity. The main lignin fraction consisted 86% of the original lignin feedstock and this fraction was practically free from carbohydrates. In addition, a lignin fraction with very low molar mass, high solubility, high number of reactive free phenolic hydroxyl groups and a low glass transition temperature, was produced. The water solubility of lignin fractions depended not only on the molar mass and functional groups, but also on carbohydrates bound to lignin. The molecules with the highest solubility were most likely covalently linked to arabinogalactan. The applied aqueous acetone fractionation method with solvent evaporation required significantly less solvents than precipitation fractionation processes with nonsolvent addition and therefore is considered technically, economically and environmentally more sound process than alternative methods.

KW - softwood kraft lignin

KW - lignin structure

KW - aqueous solvent fractionation

KW - evaporation fractionation

KW - molar mass

KW - carbohydrates

KW - glass transition temperature

UR - http://www.scopus.com/inward/record.url?scp=85051143070&partnerID=8YFLogxK

M3 - Article

VL - 32

SP - 483

EP - 490

JO - Nordic Pulp and Paper Research Journal

JF - Nordic Pulp and Paper Research Journal

SN - 0283-2631

IS - 4

ER -