Use of UV resonance Raman spectroscopy for assessing the brightness stability of ozone TCF bleached pulp
No Thumbnail Available
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2020-06-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
9
Series
Holzforschung, Volume 74, issue 6, pp. 605-613
Abstract
This study intends to explain the difference in brightness stability between hardwood ECF and TCFz kraft pulps bleached by DEpDD and A(ZEo)(ZEo)(ZP) sequences respectively, using UV Resonance Raman (UVRR) spectroscopy. The brightness stability of the pulps was tested via dry aging experiments where the Post-Color Number (PCN) of the ECF pulp was twice that of the TCF pulp. The aged and non-aged bleached pulps were analyzed with UVRR spectroscopy to identify the cause of the large difference in PCN. The spectra of ECF and TCF bleached pulps presented clear differences in the intensities of the Raman shifts associated to lignin, lignin-like compounds, and degradation products such as muconic acids. To identify more specifically the compounds affecting the PCN, several post-bleaching treatments were applied on the ECF pulp including single stages (E, B, P, Z) or combinations (ZE, ZB, ZP), and their UVRR spectra analyzed. It was found that alkaline-soluble compounds were the main culprits for the difference in PCN values between ECF and TCFz pulps. ZP combination was the most efficient in eliminating residual lignin and other unsaturated components and for the development of brightness and brightness stability.Description
Keywords
brightness stability, chromophores, ECF and TCF bleachingzone, paper pulp, UV resonance Raman spectroscopy
Other note
Citation
Montet, E, Isaza Ferro, E, Perrin, J, Lachenal, D & Chirat, C 2020, ' Use of UV resonance Raman spectroscopy for assessing the brightness stability of ozone TCF bleached pulp ', Holzforschung, vol. 74, no. 6, pp. 605-613 . https://doi.org/10.1515/hf-2019-0275