Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness

Jaakko Pere, J. P. Isoaho, S. Jussila, Anna Suurnäkki, Raimo Alén

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Dithionite bleaching of mechanical pulps and fractions thereof could be boosted by enzymatic pretreatment with pectinmethylesterase (PE). As a consequence of hydrolytic action of PE partial demethylation of pectin occurred with a concurrent release of methanol and increase in pulp charge. Demethylation of pectin by PE was associated with release of chromophoric components in successive dithionite bleaching. Evidently, brightness gain observed with the pulps and fines fraction was due to this release of lignin derived components. Main findings observed in the laboratory were also verified in pilot trials at CTP.
Original languageEnglish
Title of host publication59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005
Subtitle of host publicationProceedings
PublisherAppita
Pages311-315
Publication statusPublished - 2005
MoE publication typeA4 Article in a conference publication
Event59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry) - Auckland, New Zealand
Duration: 16 May 200519 May 2005
Conference number: 59

Publication series

SeriesAppita Annual Conference Proceedings
ISSN1443-5454

Conference

Conference59th Appita Annual Conference and Exhibition
CountryNew Zealand
CityAuckland
Period16/05/0519/05/05

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mechanical pulp
pectinesterase
bleaching
pectins
pulp
lignin
methanol
pretreatment

Cite this

Pere, J., Isoaho, J. P., Jussila, S., Suurnäkki, A., & Alén, R. (2005). Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness. In 59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005: Proceedings (pp. 311-315). Appita. Appita Annual Conference Proceedings
Pere, Jaakko ; Isoaho, J. P. ; Jussila, S. ; Suurnäkki, Anna ; Alén, Raimo. / Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness. 59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005: Proceedings. Appita, 2005. pp. 311-315 (Appita Annual Conference Proceedings).
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Pere, J, Isoaho, JP, Jussila, S, Suurnäkki, A & Alén, R 2005, Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness. in 59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005: Proceedings. Appita, Appita Annual Conference Proceedings, pp. 311-315, 59th Appita Annual Conference and Exhibition, Auckland, New Zealand, 16/05/05.

Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness. / Pere, Jaakko; Isoaho, J. P.; Jussila, S.; Suurnäkki, Anna; Alén, Raimo.

59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005: Proceedings. Appita, 2005. p. 311-315 (Appita Annual Conference Proceedings).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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Pere J, Isoaho JP, Jussila S, Suurnäkki A, Alén R. Bleaching of mechanical pulps: Implications of demethylation of pectin for pulp brightness. In 59th Appita Annual Conference and Exhibition: Incorporating the 13th ISWFPC (International Symposium on Wood, Fibre and Pulping Chemistry), Auckland, New Zealand, 16-19 May 2005: Proceedings. Appita. 2005. p. 311-315. (Appita Annual Conference Proceedings).