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
Number of pages10
JournalChemical Engineering Science
Volume60
Issue number24
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

Fingerprint

Kraft pulp
Washing
Cations
Positive ions
Ions
Acids
Fibers
Hardwoods
Manganese
Magnesium
Leaching
Effluents
Calcium
Ion exchange
Sodium
Oxygen
Liquids
Experiments

Keywords

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

Cite this

Tervola, Pekka ; Räsänen, Erkki. / A cake-washing model with an overall cation transfer in kraft pulp washing. In: Chemical Engineering Science. 2005 ; Vol. 60, No. 24. pp. 6899 - 6908.
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A cake-washing model with an overall cation transfer in kraft pulp washing. / Tervola, Pekka (Corresponding Author); Räsänen, Erkki.

In: Chemical Engineering Science, Vol. 60, No. 24, 2005, p. 6899 - 6908.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - A cake-washing model with an overall cation transfer in kraft pulp washing

AU - Tervola, Pekka

AU - Räsänen, Erkki

PY - 2005

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AB - 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.

KW - dispersion

KW - ion exchange

KW - leaching

KW - mass transfer

KW - packed bed

KW - filter cake washing

KW - kraft pulp

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VL - 60

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JO - Chemical Engineering Science

JF - Chemical Engineering Science

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