Modeling of alkaline extraction chemistry and kinetics

Susanna Kuitunen (Corresponding Author), Ville Tarvo, Tiina Liitiä, Stella Rovio, Tapani Vuorinen, Ville Alopaeus

Research output: Contribution to journalReview ArticleScientificpeer-review

8 Citations (Scopus)

Abstract

A comprehensive model for alkaline extraction (E) of chlorine dioxide delignified (D0) softwood kraft pulp (KP) is presented. The dynamics of the process is modeled by taking into account both irreversible and reversible chemical reactions and gas-liquid and liquid-liquid mass transfer. Equations linking molecular-scale composition (amounts of monomeric lignin and carbohydrate structures) and general engineering parameters [κ number (KN), brightness, intrinsic viscosity, total organic carbon (TOC), chemical oxygen demand (COD), etc.] are presented. The model is capable of reproducing the development of KN and brightness from the molecular-level kinetics. Reactions responsible for the darkening of chlorine dioxide bleached (D0) pulp in alkali, brightening of pulp due to the action of hydrogen peroxide and oxygen, and reduction in KN were identified. The model predicts the chemical composition of both fiber wall and filtrate. This feature enables studies concerning the interaction of the AE chemistry with upstream (D0 washing) and downstream (D1 stage) processes. Quantitative physicochemical modeling approach also points out shortcoming in the present knowledge.
Original languageEnglish
Pages (from-to)511-521
JournalHolzforschung
Volume68
Issue number7
DOIs
Publication statusPublished - 2013
MoE publication typeA2 Review article in a scientific journal

Fingerprint

Chlorine
Kinetics
Luminance
Liquids
Bleached pulp
Kraft pulp
Softwoods
Lignin
Chemical oxygen demand
Alkalies
Carbohydrates
Organic carbon
Chemical analysis
Washing
Hydrogen peroxide
Hydrogen Peroxide
Pulp
Chemical reactions
Mass transfer
Gases

Keywords

  • alkaline extraction
  • brightness
  • chlorine dioxide
  • chromophore

Cite this

Kuitunen, S., Tarvo, V., Liitiä, T., Rovio, S., Vuorinen, T., & Alopaeus, V. (2013). Modeling of alkaline extraction chemistry and kinetics. Holzforschung, 68(7), 511-521. https://doi.org/10.1515/hf-2013-0225
Kuitunen, Susanna ; Tarvo, Ville ; Liitiä, Tiina ; Rovio, Stella ; Vuorinen, Tapani ; Alopaeus, Ville. / Modeling of alkaline extraction chemistry and kinetics. In: Holzforschung. 2013 ; Vol. 68, No. 7. pp. 511-521.
@article{18af815499784a3ca2d64bcc22344fa7,
title = "Modeling of alkaline extraction chemistry and kinetics",
abstract = "A comprehensive model for alkaline extraction (E) of chlorine dioxide delignified (D0) softwood kraft pulp (KP) is presented. The dynamics of the process is modeled by taking into account both irreversible and reversible chemical reactions and gas-liquid and liquid-liquid mass transfer. Equations linking molecular-scale composition (amounts of monomeric lignin and carbohydrate structures) and general engineering parameters [κ number (KN), brightness, intrinsic viscosity, total organic carbon (TOC), chemical oxygen demand (COD), etc.] are presented. The model is capable of reproducing the development of KN and brightness from the molecular-level kinetics. Reactions responsible for the darkening of chlorine dioxide bleached (D0) pulp in alkali, brightening of pulp due to the action of hydrogen peroxide and oxygen, and reduction in KN were identified. The model predicts the chemical composition of both fiber wall and filtrate. This feature enables studies concerning the interaction of the AE chemistry with upstream (D0 washing) and downstream (D1 stage) processes. Quantitative physicochemical modeling approach also points out shortcoming in the present knowledge.",
keywords = "alkaline extraction, brightness, chlorine dioxide, chromophore",
author = "Susanna Kuitunen and Ville Tarvo and Tiina Liiti{\"a} and Stella Rovio and Tapani Vuorinen and Ville Alopaeus",
year = "2013",
doi = "10.1515/hf-2013-0225",
language = "English",
volume = "68",
pages = "511--521",
journal = "Holzforschung",
issn = "0018-3830",
publisher = "De Gruyter",
number = "7",

}

Kuitunen, S, Tarvo, V, Liitiä, T, Rovio, S, Vuorinen, T & Alopaeus, V 2013, 'Modeling of alkaline extraction chemistry and kinetics', Holzforschung, vol. 68, no. 7, pp. 511-521. https://doi.org/10.1515/hf-2013-0225

Modeling of alkaline extraction chemistry and kinetics. / Kuitunen, Susanna (Corresponding Author); Tarvo, Ville; Liitiä, Tiina; Rovio, Stella; Vuorinen, Tapani; Alopaeus, Ville.

In: Holzforschung, Vol. 68, No. 7, 2013, p. 511-521.

Research output: Contribution to journalReview ArticleScientificpeer-review

TY - JOUR

T1 - Modeling of alkaline extraction chemistry and kinetics

AU - Kuitunen, Susanna

AU - Tarvo, Ville

AU - Liitiä, Tiina

AU - Rovio, Stella

AU - Vuorinen, Tapani

AU - Alopaeus, Ville

PY - 2013

Y1 - 2013

N2 - A comprehensive model for alkaline extraction (E) of chlorine dioxide delignified (D0) softwood kraft pulp (KP) is presented. The dynamics of the process is modeled by taking into account both irreversible and reversible chemical reactions and gas-liquid and liquid-liquid mass transfer. Equations linking molecular-scale composition (amounts of monomeric lignin and carbohydrate structures) and general engineering parameters [κ number (KN), brightness, intrinsic viscosity, total organic carbon (TOC), chemical oxygen demand (COD), etc.] are presented. The model is capable of reproducing the development of KN and brightness from the molecular-level kinetics. Reactions responsible for the darkening of chlorine dioxide bleached (D0) pulp in alkali, brightening of pulp due to the action of hydrogen peroxide and oxygen, and reduction in KN were identified. The model predicts the chemical composition of both fiber wall and filtrate. This feature enables studies concerning the interaction of the AE chemistry with upstream (D0 washing) and downstream (D1 stage) processes. Quantitative physicochemical modeling approach also points out shortcoming in the present knowledge.

AB - A comprehensive model for alkaline extraction (E) of chlorine dioxide delignified (D0) softwood kraft pulp (KP) is presented. The dynamics of the process is modeled by taking into account both irreversible and reversible chemical reactions and gas-liquid and liquid-liquid mass transfer. Equations linking molecular-scale composition (amounts of monomeric lignin and carbohydrate structures) and general engineering parameters [κ number (KN), brightness, intrinsic viscosity, total organic carbon (TOC), chemical oxygen demand (COD), etc.] are presented. The model is capable of reproducing the development of KN and brightness from the molecular-level kinetics. Reactions responsible for the darkening of chlorine dioxide bleached (D0) pulp in alkali, brightening of pulp due to the action of hydrogen peroxide and oxygen, and reduction in KN were identified. The model predicts the chemical composition of both fiber wall and filtrate. This feature enables studies concerning the interaction of the AE chemistry with upstream (D0 washing) and downstream (D1 stage) processes. Quantitative physicochemical modeling approach also points out shortcoming in the present knowledge.

KW - alkaline extraction

KW - brightness

KW - chlorine dioxide

KW - chromophore

U2 - 10.1515/hf-2013-0225

DO - 10.1515/hf-2013-0225

M3 - Review Article

VL - 68

SP - 511

EP - 521

JO - Holzforschung

JF - Holzforschung

SN - 0018-3830

IS - 7

ER -

Kuitunen S, Tarvo V, Liitiä T, Rovio S, Vuorinen T, Alopaeus V. Modeling of alkaline extraction chemistry and kinetics. Holzforschung. 2013;68(7):511-521. https://doi.org/10.1515/hf-2013-0225