The use of a laccase mediator stage in bleaching eucalypt kraft pulps

Peter Nelson, Charles Chin, Liisa Viikari, Maija Tenkanen

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)

Abstract

An oxygen-bleached eucalypt kraft pulp (Kappa number 10.5) was used in a study of oxidative delignification with laccase and the mediator 1-hydroxybenzotriazole. The laccase treatment, followed by alkali extraction, lowered the Kappa number to 6.6. Addition of xylanase to the reaction liquor resulted in a further reduction to 5.9. Spent liquor from the laccase treatment was not effective when used a second time.
The hexenuronic acid groups in the treated pulps contributed to more than half of the measured Kappa numbers. The pulp was bleached with an L(EO)LQ(PO) sequence (where L is a laccase-mediator stage, (EO) an oxygen reinforced alkali extraction, Q a chelation stage and (PO) a pressurized hydrogen peroxide stage). Brightness of 89% ISO was attained and the tearing resistance was the same as that of pulp bleached with a D(EO)DD sequence.
An extended delignification pulp (ITC™ procedure) was bleached to 90% brightness with this sequence, but the tearing resistance was about 15% lower than when the pulp was bleached with an ECF sequence.
Original languageEnglish
Pages (from-to)451-455
JournalAppita Journal
Volume51
Issue number6
Publication statusPublished - 1998
MoE publication typeA1 Journal article-refereed

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Bleached pulp
Kraft pulp
Bleaching
Delignification
Pulp
Luminance
Oxygen
Chelation
Hydrogen peroxide
Acids

Cite this

Nelson, P., Chin, C., Viikari, L., & Tenkanen, M. (1998). The use of a laccase mediator stage in bleaching eucalypt kraft pulps. Appita Journal, 51(6), 451-455.
Nelson, Peter ; Chin, Charles ; Viikari, Liisa ; Tenkanen, Maija. / The use of a laccase mediator stage in bleaching eucalypt kraft pulps. In: Appita Journal. 1998 ; Vol. 51, No. 6. pp. 451-455.
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abstract = "An oxygen-bleached eucalypt kraft pulp (Kappa number 10.5) was used in a study of oxidative delignification with laccase and the mediator 1-hydroxybenzotriazole. The laccase treatment, followed by alkali extraction, lowered the Kappa number to 6.6. Addition of xylanase to the reaction liquor resulted in a further reduction to 5.9. Spent liquor from the laccase treatment was not effective when used a second time. The hexenuronic acid groups in the treated pulps contributed to more than half of the measured Kappa numbers. The pulp was bleached with an L(EO)LQ(PO) sequence (where L is a laccase-mediator stage, (EO) an oxygen reinforced alkali extraction, Q a chelation stage and (PO) a pressurized hydrogen peroxide stage). Brightness of 89{\%} ISO was attained and the tearing resistance was the same as that of pulp bleached with a D(EO)DD sequence. An extended delignification pulp (ITC™ procedure) was bleached to 90{\%} brightness with this sequence, but the tearing resistance was about 15{\%} lower than when the pulp was bleached with an ECF sequence.",
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Nelson, P, Chin, C, Viikari, L & Tenkanen, M 1998, 'The use of a laccase mediator stage in bleaching eucalypt kraft pulps', Appita Journal, vol. 51, no. 6, pp. 451-455.

The use of a laccase mediator stage in bleaching eucalypt kraft pulps. / Nelson, Peter; Chin, Charles; Viikari, Liisa; Tenkanen, Maija.

In: Appita Journal, Vol. 51, No. 6, 1998, p. 451-455.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - The use of a laccase mediator stage in bleaching eucalypt kraft pulps

AU - Nelson, Peter

AU - Chin, Charles

AU - Viikari, Liisa

AU - Tenkanen, Maija

PY - 1998

Y1 - 1998

N2 - An oxygen-bleached eucalypt kraft pulp (Kappa number 10.5) was used in a study of oxidative delignification with laccase and the mediator 1-hydroxybenzotriazole. The laccase treatment, followed by alkali extraction, lowered the Kappa number to 6.6. Addition of xylanase to the reaction liquor resulted in a further reduction to 5.9. Spent liquor from the laccase treatment was not effective when used a second time. The hexenuronic acid groups in the treated pulps contributed to more than half of the measured Kappa numbers. The pulp was bleached with an L(EO)LQ(PO) sequence (where L is a laccase-mediator stage, (EO) an oxygen reinforced alkali extraction, Q a chelation stage and (PO) a pressurized hydrogen peroxide stage). Brightness of 89% ISO was attained and the tearing resistance was the same as that of pulp bleached with a D(EO)DD sequence. An extended delignification pulp (ITC™ procedure) was bleached to 90% brightness with this sequence, but the tearing resistance was about 15% lower than when the pulp was bleached with an ECF sequence.

AB - An oxygen-bleached eucalypt kraft pulp (Kappa number 10.5) was used in a study of oxidative delignification with laccase and the mediator 1-hydroxybenzotriazole. The laccase treatment, followed by alkali extraction, lowered the Kappa number to 6.6. Addition of xylanase to the reaction liquor resulted in a further reduction to 5.9. Spent liquor from the laccase treatment was not effective when used a second time. The hexenuronic acid groups in the treated pulps contributed to more than half of the measured Kappa numbers. The pulp was bleached with an L(EO)LQ(PO) sequence (where L is a laccase-mediator stage, (EO) an oxygen reinforced alkali extraction, Q a chelation stage and (PO) a pressurized hydrogen peroxide stage). Brightness of 89% ISO was attained and the tearing resistance was the same as that of pulp bleached with a D(EO)DD sequence. An extended delignification pulp (ITC™ procedure) was bleached to 90% brightness with this sequence, but the tearing resistance was about 15% lower than when the pulp was bleached with an ECF sequence.

M3 - Article

VL - 51

SP - 451

EP - 455

JO - Appita Journal

JF - Appita Journal

SN - 1038-6807

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Nelson P, Chin C, Viikari L, Tenkanen M. The use of a laccase mediator stage in bleaching eucalypt kraft pulps. Appita Journal. 1998;51(6):451-455.