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

    8 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

    Fingerprint

    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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    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.",
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    author = "R. P{\"o}nni and T. P{\"a}{\"a}kk{\"o}nen and M. Nuopponen and Jaakko Pere and T. Vuorinen",
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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

    Y1 - 2014

    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

    U2 - 10.1007/s10570-014-0278-3

    DO - 10.1007/s10570-014-0278-3

    M3 - Article

    VL - 21

    SP - 2859

    EP - 2869

    JO - Cellulose

    JF - Cellulose

    SN - 0969-0239

    IS - 4

    ER -