Alkali treatment of birch kraft pulp to enhance its TEMPO catalyzed oxidation with hypochlorite

R. Pönni (Corresponding Author), T. Pääkkönen, M. Nuopponen, Jaakko Pere, T. Vuorinen

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

Alkali treatment was used to increase the reactivity of birch kraft pulp prior to its 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) catalyzed oxidation with hypochlorite, which is a process commonly applied to prepare nanofibrillated cellulose. On contrary to the traditional use of NaBr as a cocatalyst, TEMPO was activated with HOCl prior to the oxidation. Commonly, the lack of bromide increases the oxidation time and impairs the formation of carboxylic groups. However, the reaction time of the bromide-free TEMPO catalyzed oxidation could be shortened from 2.5 to 0.5 h when the pulp was treated with 1 M NaOH prior to the oxidation (2.4 mmol NaOCl/g pulp). The beneficial effect was obtained even if the alkali treatment was executed at room temperature and only for few minutes. Moreover, the alkali pretreatment enabled selective production of a pulp with carboxylate content as high as 1.6 mmol/g with NaOCl dosage of 4.4 mmol/g. The changes in the cellulosic raw material during the alkali treatment were assessed by water retention value and carbohydrate analysis.
Original languageEnglish
Pages (from-to)2859-2869
JournalCellulose
Volume21
Issue number4
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

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Hypochlorous Acid
Kraft pulp
Alkalies
Oxidation
Pulp
Bromides
Carbohydrates
Cellulose
Raw materials
Water

Keywords

  • birch
  • hypochlorite
  • nanofibrillated cellulose
  • oxidation
  • water retention value
  • xylan
  • craft pulp

Cite this

Pönni, R. ; Pääkkönen, T. ; Nuopponen, M. ; Pere, Jaakko ; Vuorinen, T. / Alkali treatment of birch kraft pulp to enhance its TEMPO catalyzed oxidation with hypochlorite. In: Cellulose. 2014 ; Vol. 21, No. 4. pp. 2859-2869.
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Alkali treatment of birch kraft pulp to enhance its TEMPO catalyzed oxidation with hypochlorite. / Pönni, R. (Corresponding Author); Pääkkönen, T.; Nuopponen, M.; Pere, Jaakko; Vuorinen, T.

In: Cellulose, Vol. 21, No. 4, 2014, p. 2859-2869.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Alkali treatment of birch kraft pulp to enhance its TEMPO catalyzed oxidation with hypochlorite

AU - Pönni, R.

AU - Pääkkönen, T.

AU - Nuopponen, M.

AU - Pere, Jaakko

AU - Vuorinen, T.

PY - 2014

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N2 - Alkali treatment was used to increase the reactivity of birch kraft pulp prior to its 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) catalyzed oxidation with hypochlorite, which is a process commonly applied to prepare nanofibrillated cellulose. On contrary to the traditional use of NaBr as a cocatalyst, TEMPO was activated with HOCl prior to the oxidation. Commonly, the lack of bromide increases the oxidation time and impairs the formation of carboxylic groups. However, the reaction time of the bromide-free TEMPO catalyzed oxidation could be shortened from 2.5 to 0.5 h when the pulp was treated with 1 M NaOH prior to the oxidation (2.4 mmol NaOCl/g pulp). The beneficial effect was obtained even if the alkali treatment was executed at room temperature and only for few minutes. Moreover, the alkali pretreatment enabled selective production of a pulp with carboxylate content as high as 1.6 mmol/g with NaOCl dosage of 4.4 mmol/g. The changes in the cellulosic raw material during the alkali treatment were assessed by water retention value and carbohydrate analysis.

AB - Alkali treatment was used to increase the reactivity of birch kraft pulp prior to its 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) catalyzed oxidation with hypochlorite, which is a process commonly applied to prepare nanofibrillated cellulose. On contrary to the traditional use of NaBr as a cocatalyst, TEMPO was activated with HOCl prior to the oxidation. Commonly, the lack of bromide increases the oxidation time and impairs the formation of carboxylic groups. However, the reaction time of the bromide-free TEMPO catalyzed oxidation could be shortened from 2.5 to 0.5 h when the pulp was treated with 1 M NaOH prior to the oxidation (2.4 mmol NaOCl/g pulp). The beneficial effect was obtained even if the alkali treatment was executed at room temperature and only for few minutes. Moreover, the alkali pretreatment enabled selective production of a pulp with carboxylate content as high as 1.6 mmol/g with NaOCl dosage of 4.4 mmol/g. The changes in the cellulosic raw material during the alkali treatment were assessed by water retention value and carbohydrate analysis.

KW - birch

KW - hypochlorite

KW - nanofibrillated cellulose

KW - oxidation

KW - water retention value

KW - xylan

KW - craft pulp

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JO - Cellulose

JF - Cellulose

SN - 0969-0239

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