Multi-phase thermodynamic modelling of pulp suspensions

Application to a papermaking process

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)

Abstract

During the past decade, multi-phase thermodynamics has been applied to pulp suspensions in order to support calcium chemistry control in neutral papermaking. During this period, multi-phase modelling was initially applied in the development of pulp acidification and pH buffering concepts, and unit operation models have been used to quantify the doses of acidification chemicals and buffering aids. The inclusion of multi-phase chemistry calculation in conventional mass and energy process simulation has enabled the monitoring of the chemistry of large process integrates. The experiences and case examples of multi-phase modelling are reviewed in the present paper. In the present study, the pH and calcium chemistry of a large process integrate were simulated in conditions that had been previously found to cause problems in paper production. The difficulties were thought to be due to increased dithionite dosing, which had been used to obtain the desired brightness of the paper product. The modelled integrate consisted of two paper machine lines with mechanical and deinked pulp as feed stocks. Simulation of the production of the high brightness grades revealed that a relatively high quantity of solid calcium carbonate is lost under these production conditions. The results improved our understanding of bleaching practices in neutral papermaking.
Original languageEnglish
Pages (from-to)613-620
Number of pages7
JournalNordic Pulp and Paper Research Journal
Volume27
Issue number3
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

papermaking
Papermaking
thermodynamics
Pulp
pulp
Suspensions
chemistry
Thermodynamics
Acidification
buffering
acidification
modeling
Luminance
Calcium
calcium
Dithionite
Paper products
process energy
Calcium Carbonate
Calcium carbonate

Keywords

  • calcium carbonate
  • multi-phase modelling
  • papermaking
  • pH control
  • process simulation

Cite this

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title = "Multi-phase thermodynamic modelling of pulp suspensions: Application to a papermaking process",
abstract = "During the past decade, multi-phase thermodynamics has been applied to pulp suspensions in order to support calcium chemistry control in neutral papermaking. During this period, multi-phase modelling was initially applied in the development of pulp acidification and pH buffering concepts, and unit operation models have been used to quantify the doses of acidification chemicals and buffering aids. The inclusion of multi-phase chemistry calculation in conventional mass and energy process simulation has enabled the monitoring of the chemistry of large process integrates. The experiences and case examples of multi-phase modelling are reviewed in the present paper. In the present study, the pH and calcium chemistry of a large process integrate were simulated in conditions that had been previously found to cause problems in paper production. The difficulties were thought to be due to increased dithionite dosing, which had been used to obtain the desired brightness of the paper product. The modelled integrate consisted of two paper machine lines with mechanical and deinked pulp as feed stocks. Simulation of the production of the high brightness grades revealed that a relatively high quantity of solid calcium carbonate is lost under these production conditions. The results improved our understanding of bleaching practices in neutral papermaking.",
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author = "Anna Kalliola and Risto Pajarre and Pertti Koukkari and Juha Hakala and E. Kukkam{\"a}ki",
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Multi-phase thermodynamic modelling of pulp suspensions : Application to a papermaking process. / Kalliola, Anna; Pajarre, Risto; Koukkari, Pertti; Hakala, Juha; Kukkamäki, E.

In: Nordic Pulp and Paper Research Journal, Vol. 27, No. 3, 2012, p. 613-620.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Multi-phase thermodynamic modelling of pulp suspensions

T2 - Application to a papermaking process

AU - Kalliola, Anna

AU - Pajarre, Risto

AU - Koukkari, Pertti

AU - Hakala, Juha

AU - Kukkamäki, E.

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Y1 - 2012

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AB - During the past decade, multi-phase thermodynamics has been applied to pulp suspensions in order to support calcium chemistry control in neutral papermaking. During this period, multi-phase modelling was initially applied in the development of pulp acidification and pH buffering concepts, and unit operation models have been used to quantify the doses of acidification chemicals and buffering aids. The inclusion of multi-phase chemistry calculation in conventional mass and energy process simulation has enabled the monitoring of the chemistry of large process integrates. The experiences and case examples of multi-phase modelling are reviewed in the present paper. In the present study, the pH and calcium chemistry of a large process integrate were simulated in conditions that had been previously found to cause problems in paper production. The difficulties were thought to be due to increased dithionite dosing, which had been used to obtain the desired brightness of the paper product. The modelled integrate consisted of two paper machine lines with mechanical and deinked pulp as feed stocks. Simulation of the production of the high brightness grades revealed that a relatively high quantity of solid calcium carbonate is lost under these production conditions. The results improved our understanding of bleaching practices in neutral papermaking.

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KW - process simulation

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