Use of UV resonance Raman spectroscopy for assessing the brightness stability of ozone TCF bleached pulp

Etienne Montet*, Estefania Isaza Ferro, Jordan Perrin, Dominique Lachenal, Christine Chirat

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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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.

Original languageEnglish
Pages (from-to)605-613
Number of pages9
JournalHolzforschung
Volume74
Issue number6
Early online date4 May 2020
DOIs
Publication statusPublished - 1 Jun 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • brightness stability
  • chromophores
  • ECF and TCF bleachingzone
  • paper pulp
  • UV resonance Raman spectroscopy

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