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Title: Kinetics of Eucalyptus globulus delignification in a methanol-water medium

Abstract

The kinetics of Eucalyptus Globulus delignification in methanol-water pulping has been studied. A total of 17 isothermal runs at a liquor-to-wood ratio of 50 L/kg were carried out to develop the kinetic model describing the system. In a first series of experiments, eight models were considered to study the influence of temperature on the delignification rate. The most suitable model, which was discriminated according to statistical criteria, describes delignification as the consecutive dissolution of three lignin species: initial, bulk, and residual lignin, their content in wood being 10, 69, and 21%, respectively. Initial and residual delignification were considered as irreversible reactions and bulk delignification as reversible. The influence of hydrogen ion concentration was taken into account by means of a general power-law expression. The model proposed was taken into account by means of a general power-law expression. The model proposed was validated by reproducing the experimental data from four runs carried out under nonisothermal conditions and a liquor-to-wood ratio of 7 L/kg, which are closer to industrial operating conditions.

Authors:
; ; ; ; ;  [1]
  1. Univ. Complutense, Madrid (Spain). Dept. de Ingenieria Quimica
Publication Date:
OSTI Identifier:
697167
Resource Type:
Journal Article
Journal Name:
Industrial and Engineering Chemistry Research
Additional Journal Information:
Journal Volume: 38; Journal Issue: 9; Other Information: PBD: Sep 1999
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; EUCALYPTUSES; DELIGNIFICATION; CHEMICAL REACTION KINETICS; KINETIC EQUATIONS; MATHEMATICAL MODELS

Citation Formats

Gilarranz, M.A., Rodriguez, F., Santos, A., Oliet, M., Garcia-Ochoa, F., and Tijero, J. Kinetics of Eucalyptus globulus delignification in a methanol-water medium. United States: N. p., 1999. Web. doi:10.1021/ie990161f.
Gilarranz, M.A., Rodriguez, F., Santos, A., Oliet, M., Garcia-Ochoa, F., & Tijero, J. Kinetics of Eucalyptus globulus delignification in a methanol-water medium. United States. doi:10.1021/ie990161f.
Gilarranz, M.A., Rodriguez, F., Santos, A., Oliet, M., Garcia-Ochoa, F., and Tijero, J. Wed . "Kinetics of Eucalyptus globulus delignification in a methanol-water medium". United States. doi:10.1021/ie990161f.
@article{osti_697167,
title = {Kinetics of Eucalyptus globulus delignification in a methanol-water medium},
author = {Gilarranz, M.A. and Rodriguez, F. and Santos, A. and Oliet, M. and Garcia-Ochoa, F. and Tijero, J.},
abstractNote = {The kinetics of Eucalyptus Globulus delignification in methanol-water pulping has been studied. A total of 17 isothermal runs at a liquor-to-wood ratio of 50 L/kg were carried out to develop the kinetic model describing the system. In a first series of experiments, eight models were considered to study the influence of temperature on the delignification rate. The most suitable model, which was discriminated according to statistical criteria, describes delignification as the consecutive dissolution of three lignin species: initial, bulk, and residual lignin, their content in wood being 10, 69, and 21%, respectively. Initial and residual delignification were considered as irreversible reactions and bulk delignification as reversible. The influence of hydrogen ion concentration was taken into account by means of a general power-law expression. The model proposed was taken into account by means of a general power-law expression. The model proposed was validated by reproducing the experimental data from four runs carried out under nonisothermal conditions and a liquor-to-wood ratio of 7 L/kg, which are closer to industrial operating conditions.},
doi = {10.1021/ie990161f},
journal = {Industrial and Engineering Chemistry Research},
number = 9,
volume = 38,
place = {United States},
year = {1999},
month = {9}
}