Modeling of alkaline extraction chemistry and kinetics of softwood kraft pulp

Tutkimustuotos: Lehtiartikkeli

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Modeling of alkaline extraction chemistry and kinetics of softwood kraft pulp. / Kuitunen, Susanna; Tarvo, Ville; Liitiä, Tiina; Rovio, Stella; Vuorinen, Tapani; Alopaeus, Ville.

julkaisussa: Holzforschung, Vuosikerta 68, Nro 7, 01.10.2014, s. 733-746.

Tutkimustuotos: Lehtiartikkeli

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Kuitunen, Susanna ; Tarvo, Ville ; Liitiä, Tiina ; Rovio, Stella ; Vuorinen, Tapani ; Alopaeus, Ville. / Modeling of alkaline extraction chemistry and kinetics of softwood kraft pulp. Julkaisussa: Holzforschung. 2014 ; Vuosikerta 68, Nro 7. Sivut 733-746.

Bibtex - Lataa

@article{6e9bdb6b6645450ab0eaf305ac50cdce,
title = "Modeling of alkaline extraction chemistry and kinetics of softwood kraft pulp",
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, Donnan effect, engineering parameter, hydrogen peroxide, kappa number, modeling, oxygen, phase equilibrium, pulp, reaction equilibrium, reaction kinetics, softwood",
author = "Susanna Kuitunen and Ville Tarvo and Tiina Liiti{\"a} and Stella Rovio and Tapani Vuorinen and Ville Alopaeus",
year = "2014",
month = "10",
day = "1",
doi = "10.1515/hf-2013-0225",
language = "English",
volume = "68",
pages = "733--746",
journal = "Holzforschung",
issn = "0018-3830",
publisher = "Walter De Gruyter",
number = "7",

}

RIS - Lataa

TY - JOUR

T1 - Modeling of alkaline extraction chemistry and kinetics of softwood kraft pulp

AU - Kuitunen, Susanna

AU - Tarvo, Ville

AU - Liitiä, Tiina

AU - Rovio, Stella

AU - Vuorinen, Tapani

AU - Alopaeus, Ville

PY - 2014/10/1

Y1 - 2014/10/1

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

KW - Donnan effect

KW - engineering parameter

KW - hydrogen peroxide

KW - kappa number

KW - modeling

KW - oxygen

KW - phase equilibrium

KW - pulp

KW - reaction equilibrium

KW - reaction kinetics

KW - softwood

UR - http://www.scopus.com/inward/record.url?scp=84961367052&partnerID=8YFLogxK

U2 - 10.1515/hf-2013-0225

DO - 10.1515/hf-2013-0225

M3 - Article

VL - 68

SP - 733

EP - 746

JO - Holzforschung

JF - Holzforschung

SN - 0018-3830

IS - 7

ER -

ID: 9395435