Brightness stability of eucalyptus-dissolving pulps: effect of the bleaching sequence

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Brightness stability of eucalyptus-dissolving pulps : effect of the bleaching sequence. / Perrin, Jordan; Lachenal, Dominique; Chirat, Christine.

In: Holzforschung, Vol. 71, No. 7-8, 07.2017, p. 625-631.

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Perrin, Jordan ; Lachenal, Dominique ; Chirat, Christine. / Brightness stability of eucalyptus-dissolving pulps : effect of the bleaching sequence. In: Holzforschung. 2017 ; Vol. 71, No. 7-8. pp. 625-631.

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@article{3ccc885c7b964acf97a5482e7bafd213,
title = "Brightness stability of eucalyptus-dissolving pulps: effect of the bleaching sequence",
abstract = "The factors governing the brightness reversion (BR) of dissolving pulps under heat exposure are investigated. Carbonyl (CO) groups were artificially introduced on fully bleached pulp by sodium hypochlorite (NaClO) oxidation. It was demonstrated that the CO groups are responsible for loss of brightness stability (BS). These groups were partly eliminated by an alkaline extraction stage (E), which improved BS. However, an alkaline peroxide stage (P) was more efficient than E to improve BS, but without any additional CO loss. Moreover, an unbleached dissolving pulp was bleached in the laboratory by elemental chlorine free (ECF) and totally chlorine free (TCF) [ozone-based] sequences to the same brightness. The very low CO content was about the same in both cases. The ECF-bleached pulp showed substantially lower BS than the TCF pulp. These results are interpreted such that the chemistry of chromophores in the unbleached pulp also governs BS. In situ detection of phenolic and quinone chromophores in bleached dissolving pulp was performed by electron paramagnetic resonance (EPR) spectroscopy and ultraviolet resonance Raman (UVRR) spectroscopy. The content of these groups was bleaching-sequence-dependent, which may be related to the BS differences.",
keywords = "brightness reversion, carbonyl groups, dissolving pulp, ECF and TCF bleaching, EPR spectroscopy, phenolic OH groups, quinone chromophores, UV resonance Raman spectroscopy, CARBONYL GROUPS, KRAFT PULP, CELLULOSIC MATERIALS, HYDROGEN-PEROXIDE, RADICAL FORMATION, CHLORINE DIOXIDE, OZONE TREATMENT, REVERSION, CHROMOPHORES, ALKALINE",
author = "Jordan Perrin and Dominique Lachenal and Christine Chirat",
year = "2017",
month = "7",
doi = "10.1515/hf-2016-0208",
language = "English",
volume = "71",
pages = "625--631",
journal = "Holzforschung",
issn = "0018-3830",
number = "7-8",

}

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TY - JOUR

T1 - Brightness stability of eucalyptus-dissolving pulps

T2 - effect of the bleaching sequence

AU - Perrin, Jordan

AU - Lachenal, Dominique

AU - Chirat, Christine

PY - 2017/7

Y1 - 2017/7

N2 - The factors governing the brightness reversion (BR) of dissolving pulps under heat exposure are investigated. Carbonyl (CO) groups were artificially introduced on fully bleached pulp by sodium hypochlorite (NaClO) oxidation. It was demonstrated that the CO groups are responsible for loss of brightness stability (BS). These groups were partly eliminated by an alkaline extraction stage (E), which improved BS. However, an alkaline peroxide stage (P) was more efficient than E to improve BS, but without any additional CO loss. Moreover, an unbleached dissolving pulp was bleached in the laboratory by elemental chlorine free (ECF) and totally chlorine free (TCF) [ozone-based] sequences to the same brightness. The very low CO content was about the same in both cases. The ECF-bleached pulp showed substantially lower BS than the TCF pulp. These results are interpreted such that the chemistry of chromophores in the unbleached pulp also governs BS. In situ detection of phenolic and quinone chromophores in bleached dissolving pulp was performed by electron paramagnetic resonance (EPR) spectroscopy and ultraviolet resonance Raman (UVRR) spectroscopy. The content of these groups was bleaching-sequence-dependent, which may be related to the BS differences.

AB - The factors governing the brightness reversion (BR) of dissolving pulps under heat exposure are investigated. Carbonyl (CO) groups were artificially introduced on fully bleached pulp by sodium hypochlorite (NaClO) oxidation. It was demonstrated that the CO groups are responsible for loss of brightness stability (BS). These groups were partly eliminated by an alkaline extraction stage (E), which improved BS. However, an alkaline peroxide stage (P) was more efficient than E to improve BS, but without any additional CO loss. Moreover, an unbleached dissolving pulp was bleached in the laboratory by elemental chlorine free (ECF) and totally chlorine free (TCF) [ozone-based] sequences to the same brightness. The very low CO content was about the same in both cases. The ECF-bleached pulp showed substantially lower BS than the TCF pulp. These results are interpreted such that the chemistry of chromophores in the unbleached pulp also governs BS. In situ detection of phenolic and quinone chromophores in bleached dissolving pulp was performed by electron paramagnetic resonance (EPR) spectroscopy and ultraviolet resonance Raman (UVRR) spectroscopy. The content of these groups was bleaching-sequence-dependent, which may be related to the BS differences.

KW - brightness reversion

KW - carbonyl groups

KW - dissolving pulp

KW - ECF and TCF bleaching

KW - EPR spectroscopy

KW - phenolic OH groups

KW - quinone chromophores

KW - UV resonance Raman spectroscopy

KW - CARBONYL GROUPS

KW - KRAFT PULP

KW - CELLULOSIC MATERIALS

KW - HYDROGEN-PEROXIDE

KW - RADICAL FORMATION

KW - CHLORINE DIOXIDE

KW - OZONE TREATMENT

KW - REVERSION

KW - CHROMOPHORES

KW - ALKALINE

U2 - 10.1515/hf-2016-0208

DO - 10.1515/hf-2016-0208

M3 - Article

VL - 71

SP - 625

EP - 631

JO - Holzforschung

JF - Holzforschung

SN - 0018-3830

IS - 7-8

ER -

ID: 14527938