Sulfur-free pulping of hot-water-extracted spruce sawdust

Joni Lehto (Corresponding Author), Raimo Alén, Marjatta Kleen

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

Softwood (Picea abies) sawdust was hotwater- extracted with two multi-phase processes (160- 180°C, 100-280 min, and liquor-to-wood ratio 5 l/kg) corresponding to P-factors of ~780 (yield 80.0%) and ~4580 (yield 72.4%). The pre-treated materials were then pulped with the soda-AQ cooking (170°C, NaOH charge 20%, AQ charge 0.1%, 30-150 min, and liquor-to-wood ratio 5 l/kg), resulting in a yield range of 36.1-61.4% (for reference cooks without pre-extraction 47.9-60.0%). It was observed that the pre-extraction under moderate conditions enhanced the dissolution especially of largemolar- mass lignin during cooking, and the total amount of the dissolved lignin was also higher than that removed from the material pre-extracted under harsh conditions. Additionally, in the former case the pulps with rather good properties (high yield and low amount of pulp rejects) were obtained, whereas in the latter case, a pronounced degradation of pulp carbohydrates to aliphatic acids was observed resulting in lower pulp properties.
Original languageEnglish
Pages (from-to)41-48
JournalNordic Pulp and Paper Research Journal
Volume31
Issue number1
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Sawdust
pulping
sawdust
Sulfur
Pulp
pulp
Picea
sulfur
Water
Lignin
Cooking
lignin
cooking
Wood
water
Softwoods
softwood
Carbohydrates
Picea abies
carbohydrate

Keywords

  • Aliphatic acids
  • Carbohydrates
  • Extractives
  • Hemicelluloses
  • Hot-water pre-treatment
  • Lignin
  • Molar-mass distribution
  • Norway spruce

Cite this

Lehto, Joni ; Alén, Raimo ; Kleen, Marjatta. / Sulfur-free pulping of hot-water-extracted spruce sawdust. In: Nordic Pulp and Paper Research Journal. 2016 ; Vol. 31, No. 1. pp. 41-48.
@article{194796ca8b2740a399df3b20330e5e1e,
title = "Sulfur-free pulping of hot-water-extracted spruce sawdust",
abstract = "Softwood (Picea abies) sawdust was hotwater- extracted with two multi-phase processes (160- 180°C, 100-280 min, and liquor-to-wood ratio 5 l/kg) corresponding to P-factors of ~780 (yield 80.0{\%}) and ~4580 (yield 72.4{\%}). The pre-treated materials were then pulped with the soda-AQ cooking (170°C, NaOH charge 20{\%}, AQ charge 0.1{\%}, 30-150 min, and liquor-to-wood ratio 5 l/kg), resulting in a yield range of 36.1-61.4{\%} (for reference cooks without pre-extraction 47.9-60.0{\%}). It was observed that the pre-extraction under moderate conditions enhanced the dissolution especially of largemolar- mass lignin during cooking, and the total amount of the dissolved lignin was also higher than that removed from the material pre-extracted under harsh conditions. Additionally, in the former case the pulps with rather good properties (high yield and low amount of pulp rejects) were obtained, whereas in the latter case, a pronounced degradation of pulp carbohydrates to aliphatic acids was observed resulting in lower pulp properties.",
keywords = "Aliphatic acids, Carbohydrates, Extractives, Hemicelluloses, Hot-water pre-treatment, Lignin, Molar-mass distribution, Norway spruce",
author = "Joni Lehto and Raimo Al{\'e}n and Marjatta Kleen",
year = "2016",
doi = "10.3183/NPPRJ-2016-31-01-p041-048",
language = "English",
volume = "31",
pages = "41--48",
journal = "Nordic Pulp and Paper Research Journal",
issn = "0283-2631",
publisher = "De Gruyter",
number = "1",

}

Sulfur-free pulping of hot-water-extracted spruce sawdust. / Lehto, Joni (Corresponding Author); Alén, Raimo; Kleen, Marjatta.

In: Nordic Pulp and Paper Research Journal, Vol. 31, No. 1, 2016, p. 41-48.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Sulfur-free pulping of hot-water-extracted spruce sawdust

AU - Lehto, Joni

AU - Alén, Raimo

AU - Kleen, Marjatta

PY - 2016

Y1 - 2016

N2 - Softwood (Picea abies) sawdust was hotwater- extracted with two multi-phase processes (160- 180°C, 100-280 min, and liquor-to-wood ratio 5 l/kg) corresponding to P-factors of ~780 (yield 80.0%) and ~4580 (yield 72.4%). The pre-treated materials were then pulped with the soda-AQ cooking (170°C, NaOH charge 20%, AQ charge 0.1%, 30-150 min, and liquor-to-wood ratio 5 l/kg), resulting in a yield range of 36.1-61.4% (for reference cooks without pre-extraction 47.9-60.0%). It was observed that the pre-extraction under moderate conditions enhanced the dissolution especially of largemolar- mass lignin during cooking, and the total amount of the dissolved lignin was also higher than that removed from the material pre-extracted under harsh conditions. Additionally, in the former case the pulps with rather good properties (high yield and low amount of pulp rejects) were obtained, whereas in the latter case, a pronounced degradation of pulp carbohydrates to aliphatic acids was observed resulting in lower pulp properties.

AB - Softwood (Picea abies) sawdust was hotwater- extracted with two multi-phase processes (160- 180°C, 100-280 min, and liquor-to-wood ratio 5 l/kg) corresponding to P-factors of ~780 (yield 80.0%) and ~4580 (yield 72.4%). The pre-treated materials were then pulped with the soda-AQ cooking (170°C, NaOH charge 20%, AQ charge 0.1%, 30-150 min, and liquor-to-wood ratio 5 l/kg), resulting in a yield range of 36.1-61.4% (for reference cooks without pre-extraction 47.9-60.0%). It was observed that the pre-extraction under moderate conditions enhanced the dissolution especially of largemolar- mass lignin during cooking, and the total amount of the dissolved lignin was also higher than that removed from the material pre-extracted under harsh conditions. Additionally, in the former case the pulps with rather good properties (high yield and low amount of pulp rejects) were obtained, whereas in the latter case, a pronounced degradation of pulp carbohydrates to aliphatic acids was observed resulting in lower pulp properties.

KW - Aliphatic acids

KW - Carbohydrates

KW - Extractives

KW - Hemicelluloses

KW - Hot-water pre-treatment

KW - Lignin

KW - Molar-mass distribution

KW - Norway spruce

U2 - 10.3183/NPPRJ-2016-31-01-p041-048

DO - 10.3183/NPPRJ-2016-31-01-p041-048

M3 - Article

VL - 31

SP - 41

EP - 48

JO - Nordic Pulp and Paper Research Journal

JF - Nordic Pulp and Paper Research Journal

SN - 0283-2631

IS - 1

ER -