Novel CED-based rheological test to evaluate pulp reactivity

Sara Ceccherini, Thaddeus Maloney

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


Reactivity is an important quality parameter for some grades of pulp,
but its estimation is usually complex and time demanding. The study
verified the possibility to utilize an alternative rheological approach to
investigate pulp reactivity rapidly and with limited effort. 12.5 ml of
pulp at 1.5% consistency was dissolved in 12.5 ml bis(ethylenediamine)
copper(II) hydroxide solution (CED) 1 M. The reaction was moni-
tored by a torque rheogram and its two indices: the optimal dissolution
time (ODT) and the initial dissolution rate (IDR). The method used to
assess pulps either hornified to different extents or subjected to enzy-
matic hydrolysis. ODT was shown to decrease with increasing pulp
swelling, while IDR reported the opposite trend. Both the indices were
shown to be sensitive to pulp treatments. However, the ODT showed
larger differences between hardwood and softwood pulps. The method
had reasonable statistical reliability and required only 1.5 h per
Original languageEnglish
Title of host publicationAdvances in Pulp and Paper Research
Place of PublicationOxford
PublisherPulp and Paper Fundamental Research Society (FRC)
ISBN (Print)978-0-9926163-3-5
Publication statusPublished - 2017
MoE publication typeA4 Article in a conference publication
EventFundamental Research Symposium - Oxford, United Kingdom
Duration: 3 Sept 20178 Sept 2017
Conference number: 16


ConferenceFundamental Research Symposium
Abbreviated titleFRC
Country/TerritoryUnited Kingdom


  • Pulp
  • Reactivity
  • Dissolution


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