Effect of hydroxide and sulfite ion concentration in alkaline sulfite anthraquinone (ASA) pulping: A comparative study

Markus Paananen (Corresponding Author), Stella Rovio, Tiina Liitiä, Herbert Sixta (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Pulp and black liquor produced by alkaline sulfite anthraquinone (ASA) process were comprehensively characterized to evaluate the effects of ion concentration on the delignification and polysaccharide preservation. Scots pine wood meal was pulped at 160°C with a sulfite-to-hydroxide ion ratio of 0.75 and liquor-to-wood ratio of 200:1. Two concentration levels were studied in presence and absence of anthraquinone (AQ). Contrary to the expectations, already the lower concentration level (L-ASA) revealed rapid delignification in presence of AQ, while only moderate acceleration was obtained at the high concentration level (H-ASA). However, H-ASA liquor resulted in a slightly higher pulp yield of 1-2% (based on wood) but only in case of pulps with kappa numbers (KN) above 60. With progressing delignification, the yield advantage was gradually lost. The higher pulp yield at H-ASA conditions was mainly due to improved galactoglucomannan retention, which was around 2% on KN60 pulp and around 0.5% after prolonged delignification. The xylan content, on the other hand, was found to be 1% (based on wood) lower under H-ASA conditions compared to L-ASA conditions, which may be attributed to an increased solubility of short-chain polysaccharides at high alkali concentration.
Original languageEnglish
Pages (from-to)661-666
JournalHolzforschung
Volume69
Issue number6
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

Fingerprint

Anthraquinones
Sulfites
Delignification
Pulp
Ions
Wood
Polysaccharides
Sulfite process
Solubility
hydroxide ion
Xylans
Alkalies

Keywords

  • anthraquinone
  • black liquor
  • degradation
  • dissolution of polysaccharides
  • galactoglucomannan (GGM) stabilization
  • Scots pine

Cite this

@article{0f5eb1d8538a4898ba0d5354d0e264da,
title = "Effect of hydroxide and sulfite ion concentration in alkaline sulfite anthraquinone (ASA) pulping: A comparative study",
abstract = "Pulp and black liquor produced by alkaline sulfite anthraquinone (ASA) process were comprehensively characterized to evaluate the effects of ion concentration on the delignification and polysaccharide preservation. Scots pine wood meal was pulped at 160°C with a sulfite-to-hydroxide ion ratio of 0.75 and liquor-to-wood ratio of 200:1. Two concentration levels were studied in presence and absence of anthraquinone (AQ). Contrary to the expectations, already the lower concentration level (L-ASA) revealed rapid delignification in presence of AQ, while only moderate acceleration was obtained at the high concentration level (H-ASA). However, H-ASA liquor resulted in a slightly higher pulp yield of 1-2{\%} (based on wood) but only in case of pulps with kappa numbers (KN) above 60. With progressing delignification, the yield advantage was gradually lost. The higher pulp yield at H-ASA conditions was mainly due to improved galactoglucomannan retention, which was around 2{\%} on KN60 pulp and around 0.5{\%} after prolonged delignification. The xylan content, on the other hand, was found to be 1{\%} (based on wood) lower under H-ASA conditions compared to L-ASA conditions, which may be attributed to an increased solubility of short-chain polysaccharides at high alkali concentration.",
keywords = "anthraquinone, black liquor, degradation, dissolution of polysaccharides, galactoglucomannan (GGM) stabilization, Scots pine",
author = "Markus Paananen and Stella Rovio and Tiina Liiti{\"a} and Herbert Sixta",
year = "2015",
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language = "English",
volume = "69",
pages = "661--666",
journal = "Holzforschung",
issn = "0018-3830",
publisher = "De Gruyter",
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Effect of hydroxide and sulfite ion concentration in alkaline sulfite anthraquinone (ASA) pulping : A comparative study. / Paananen, Markus (Corresponding Author); Rovio, Stella; Liitiä, Tiina; Sixta, Herbert (Corresponding Author).

In: Holzforschung, Vol. 69, No. 6, 2015, p. 661-666.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Effect of hydroxide and sulfite ion concentration in alkaline sulfite anthraquinone (ASA) pulping

T2 - A comparative study

AU - Paananen, Markus

AU - Rovio, Stella

AU - Liitiä, Tiina

AU - Sixta, Herbert

PY - 2015

Y1 - 2015

N2 - Pulp and black liquor produced by alkaline sulfite anthraquinone (ASA) process were comprehensively characterized to evaluate the effects of ion concentration on the delignification and polysaccharide preservation. Scots pine wood meal was pulped at 160°C with a sulfite-to-hydroxide ion ratio of 0.75 and liquor-to-wood ratio of 200:1. Two concentration levels were studied in presence and absence of anthraquinone (AQ). Contrary to the expectations, already the lower concentration level (L-ASA) revealed rapid delignification in presence of AQ, while only moderate acceleration was obtained at the high concentration level (H-ASA). However, H-ASA liquor resulted in a slightly higher pulp yield of 1-2% (based on wood) but only in case of pulps with kappa numbers (KN) above 60. With progressing delignification, the yield advantage was gradually lost. The higher pulp yield at H-ASA conditions was mainly due to improved galactoglucomannan retention, which was around 2% on KN60 pulp and around 0.5% after prolonged delignification. The xylan content, on the other hand, was found to be 1% (based on wood) lower under H-ASA conditions compared to L-ASA conditions, which may be attributed to an increased solubility of short-chain polysaccharides at high alkali concentration.

AB - Pulp and black liquor produced by alkaline sulfite anthraquinone (ASA) process were comprehensively characterized to evaluate the effects of ion concentration on the delignification and polysaccharide preservation. Scots pine wood meal was pulped at 160°C with a sulfite-to-hydroxide ion ratio of 0.75 and liquor-to-wood ratio of 200:1. Two concentration levels were studied in presence and absence of anthraquinone (AQ). Contrary to the expectations, already the lower concentration level (L-ASA) revealed rapid delignification in presence of AQ, while only moderate acceleration was obtained at the high concentration level (H-ASA). However, H-ASA liquor resulted in a slightly higher pulp yield of 1-2% (based on wood) but only in case of pulps with kappa numbers (KN) above 60. With progressing delignification, the yield advantage was gradually lost. The higher pulp yield at H-ASA conditions was mainly due to improved galactoglucomannan retention, which was around 2% on KN60 pulp and around 0.5% after prolonged delignification. The xylan content, on the other hand, was found to be 1% (based on wood) lower under H-ASA conditions compared to L-ASA conditions, which may be attributed to an increased solubility of short-chain polysaccharides at high alkali concentration.

KW - anthraquinone

KW - black liquor

KW - degradation

KW - dissolution of polysaccharides

KW - galactoglucomannan (GGM) stabilization

KW - Scots pine

U2 - 10.1515/hf-2014-0303

DO - 10.1515/hf-2014-0303

M3 - Article

VL - 69

SP - 661

EP - 666

JO - Holzforschung

JF - Holzforschung

SN - 0018-3830

IS - 6

ER -