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Journal articles
Magazine articles
Open Access
Model development for real oxygen delignification processes, TAPPI Journal October 2024

ABSTRACT: Previous extensive work has been done on modeling the oxygen delignification process, based on how the basic parameters, i.e., temperature, kappa number, concentration of alkali, and concentration of oxygen, affect the delignification rate. However, these models are not used extensively to evaluate the performance of real processes, primarily because they have not been able to properly consider all the essential issues affecting delignification in practice. Such issues include the mass transfer and consumption of oxygen, which defines the concentration of dissolved oxygen in the process, and the effect of that concentration on the delignification rate. In this paper, a new way to model the oxygen delignification process is used in which these parameters, among other smaller matters, are taken into account. The basic model and its parameters were defined by the information obtained from the literature, delignification made in the laboratory tests, and mill processes and mill tests. An essential aspect of these studies was the information obtained from the oxygen concentration measured in the residual gas obtained from the top of the reactor. With the aid of this measurement, it was possible to define more accurately the consumption of oxygen and partial pressure of oxygen that define the concentration of dissolved oxygen in the reactor. Using mill experiments, a model was formed that predicts the operation of the oxygen delignification process. The model was used to show how much the process could be improved by optimizing the charge of the oxygen. The mill experiments also confirmed that mass transfer of oxygen is modeled correctly enough, except when the charge of oxygen is very low and/or the mixing is not efficient enough. In that case, there is variation in the concentration of oxygen in the process that should be taken into account in the modeling.

Journal articles
Open Access
Cavitation-jet deinking: A new technology for deinking of recovered paper, TAPPI JOURNAL September 2014

Cavitation-jet deinking: A new technology for deinking of recovered paper, TAPPI JOURNAL September 2014

Journal articles
Open Access
Organic material dissolved during oxygen-alkali pulping of hot water-extracted birch sawdust 15APR237

Organic material dissolved during oxygen-alkali pulping of hot water-extracted birch sawdust, TAPPI JOURNAL April 2015

Journal articles
Open Access
Systematic screening of biorefinery technologies at the early stage of design, TAPPI JOURNAL October 2012

Systematic screening of biorefinery technologies at the early stage of design, TAPPI JOURNAL October 2012

Journal articles
Open Access
Semi-bleached paper and fermentation products from a larch biorefinery, TAPPI JOURNAL October 2012

Semi-bleached paper and fermentation products from a larch biorefinery, TAPPI JOURNAL October 2012

Journal articles
Open Access
Effect of commercial xylanases applied at extreme conditions in a eucalyptus pulp mill, TAPPI JOURNAL October 2012

Effect of commercial xylanases applied at extreme conditions in a eucalyptus pulp mill, TAPPI JOURNAL October 2012

Journal articles
Magazine articles
Open Access
Impact of dissolved matter in the oxygen delignifcation stag

Impact of dissolved matter in the oxygen delignifcation stage, TAPPI JOURNAL May 2017

Journal articles
Open Access
Detailed characterization of poor settling green liquor dregs, TAPPI JOURNAL September 2013

Detailed characterization of poor settling green liquor dregs, TAPPI JOURNAL September 2013

Journal articles
Open Access
A theoretical analysis of recirculation in pulp refiners, TAPPI JOURNAL April 2014

A theoretical analysis of recirculation in pulp refiners, TAPPI JOURNAL April 2014

Journal articles
Open Access
Editorial: Peer-Reviewed Engineering highlights from PEERS 2013, TAPPI JOURNAL August 2014

Editorial: Peer-Reviewed Engineering highlights from PEERS 2013, TAPPI JOURNAL August 2014

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