Determination of the contribution of penetration, diffusion and alkali consumption in the impregnation of Eucalyptus grandis chips

Marjo Määttänen, P. Tikka

Research output: Contribution to journal › Article › Scientific › peer-review

Abstract

The influence of impregnation conditions on the phenomena involved in the impregnation of Eucalyptus grandis chips was studied with the aid of a new impregnation method. When pre-steaming was used, 30 minutes of penetration time was sufficient to achieve the final degree of penetration (over 95%) with white and black liquor. An impregnation time of 15 minutes was found to be sufficient to transfer the required amount of alkali into the wood for kraft cooking, provided that a high-concentrate white liquor was used. Only part of the alkali required was transferred into chips during 60 minutes of impregnation using black liquor with an effective alkali concentration of 20g NaOH/L. In addition, almost all of the alkali was consumed as it entered into the wood. This risks running out of alkali if the temperature is raised quickly to cooking temperature.
Original languageEnglish
Pages (from-to)313-321
Number of pages8
JournalAppita Journal
Volume66
Issue number4
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

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Impregnation
Cooking
Wood
Temperature

Keywords

  • alkali consumption
  • alkali uptake
  • eucalypt chips
  • impregnation
  • penetration

Cite this

Määttänen, Marjo ; Tikka, P. / Determination of the contribution of penetration, diffusion and alkali consumption in the impregnation of Eucalyptus grandis chips. In: Appita Journal. 2013 ; Vol. 66, No. 4. pp. 313-321.
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abstract = "The influence of impregnation conditions on the phenomena involved in the impregnation of Eucalyptus grandis chips was studied with the aid of a new impregnation method. When pre-steaming was used, 30 minutes of penetration time was sufficient to achieve the final degree of penetration (over 95{\%}) with white and black liquor. An impregnation time of 15 minutes was found to be sufficient to transfer the required amount of alkali into the wood for kraft cooking, provided that a high-concentrate white liquor was used. Only part of the alkali required was transferred into chips during 60 minutes of impregnation using black liquor with an effective alkali concentration of 20g NaOH/L. In addition, almost all of the alkali was consumed as it entered into the wood. This risks running out of alkali if the temperature is raised quickly to cooking temperature.",
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Määttänen, M & Tikka, P 2013, 'Determination of the contribution of penetration, diffusion and alkali consumption in the impregnation of Eucalyptus grandis chips', Appita Journal, vol. 66, no. 4, pp. 313-321.

Determination of the contribution of penetration, diffusion and alkali consumption in the impregnation of Eucalyptus grandis chips. / Määttänen, Marjo; Tikka, P.

In: Appita Journal, Vol. 66, No. 4, 2013, p. 313-321.

Research output: Contribution to journal › Article › Scientific › peer-review

TY - JOUR

T1 - Determination of the contribution of penetration, diffusion and alkali consumption in the impregnation of Eucalyptus grandis chips

AU - Määttänen, Marjo

AU - Tikka, P.

PY - 2013

Y1 - 2013

N2 - The influence of impregnation conditions on the phenomena involved in the impregnation of Eucalyptus grandis chips was studied with the aid of a new impregnation method. When pre-steaming was used, 30 minutes of penetration time was sufficient to achieve the final degree of penetration (over 95%) with white and black liquor. An impregnation time of 15 minutes was found to be sufficient to transfer the required amount of alkali into the wood for kraft cooking, provided that a high-concentrate white liquor was used. Only part of the alkali required was transferred into chips during 60 minutes of impregnation using black liquor with an effective alkali concentration of 20g NaOH/L. In addition, almost all of the alkali was consumed as it entered into the wood. This risks running out of alkali if the temperature is raised quickly to cooking temperature.

AB - The influence of impregnation conditions on the phenomena involved in the impregnation of Eucalyptus grandis chips was studied with the aid of a new impregnation method. When pre-steaming was used, 30 minutes of penetration time was sufficient to achieve the final degree of penetration (over 95%) with white and black liquor. An impregnation time of 15 minutes was found to be sufficient to transfer the required amount of alkali into the wood for kraft cooking, provided that a high-concentrate white liquor was used. Only part of the alkali required was transferred into chips during 60 minutes of impregnation using black liquor with an effective alkali concentration of 20g NaOH/L. In addition, almost all of the alkali was consumed as it entered into the wood. This risks running out of alkali if the temperature is raised quickly to cooking temperature.

KW - alkali consumption

KW - alkali uptake

KW - eucalypt chips

KW - impregnation

KW - penetration

M3 - Article

VL - 66

SP - 313

EP - 321

JO - Appita Journal

JF - Appita Journal

SN - 1038-6807

IS - 4

ER -

Määttänen M, Tikka P. Determination of the contribution of penetration, diffusion and alkali consumption in the impregnation of Eucalyptus grandis chips. Appita Journal. 2013;66(4):313-321.

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