A cake-washing model with an overall cation transfer in kraft pulp washing

Pekka Tervola (Corresponding Author), Erkki Räsänen

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)

Abstract

Cake washing of freely mobile ions was described by an advection–dispersion equation combined with the Donnan equilibrium and an overall ion transfer model between the external liquid phase and the fiber phase of kraft pulp. The ion exchange rate coefficients between the phases were determined from the earlier published leaching test results for an oxygen delignified Scandinavian hardwood kraft pulp. The time constant of the first order process model was about 19 s for calcium and manganese and about 6 s for sodium and magnesium. The calculated results for various elements during the acid displacement were compared with the published displacement experiments. Calculated concentrations and pH profiles in wash effluent and cake were shown. Moreover, changes in pH values and redistribution of ions between the external phase and the fiber phase in the cake during the acid displacement were also demonstrated.
Original languageEnglish
Pages (from-to)6899-6908
JournalChemical Engineering Science
Volume60
Issue number24
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

Keywords

  • dispersion
  • ion exchange
  • leaching
  • mass transfer
  • packed bed
  • filter cake washing
  • kraft pulp

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