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Journal articles
Magazine articles
Open Access
The role of gas dispersion in the oxygen delignification process, TAPPI Journal May 2021

ABSTRACT: Oxygen delignification is an essential part of the pulp production process. Delignification occurs with the aid of alkali and dissolved oxygen. Dissolved oxygen is obtained by dispersing oxygen gas into the pulp suspension by using efficient mixers. Little is known about the state of oxygen gas dispersion and its effect on oxygen delignification kinetics and efficiency. This paper will present the results for the effect of gas bubble size on the performance of oxygen delignification. The results are mainly based on detailed studies made in a Finnish hardwood mill where the oxygen bubble size distribution could be altered at the feed of the reactor. An essential aspect of these studies was the use of a new continuous inline gas bubble size measurement system to simultaneously determine the bubble size distribution at the feed and top of the reactor. Information about oxygen consumption in the reactor could also be obtained through the bubble size measurements. Accordingly, these studies quantify the effect of oxygen bubble size on the kappa reduction of the pulp. The effect of different chemical factors on the oxygen bubble size is also studied.Finally, the relationship between the gas bubble size and the liquid phase oxygen mass transfer coefficient (kLa) is presented. This connects the bubble size to the kappa reduction rate. Based on the presented modeling approach and the evaluation of practical factors that are not taken into account in the modeling, it was concluded that the volumetric average oxygen bubble size should preferably be smaller than 0.2 mm in practice.The information obtained with the new gas bubble size measurement system and the presented modeling approach give a very new basis for understanding, monitoring, adjusting, and designing oxygen delignification processes.

Magazine articles
Open Access
English as a first and second language - part 7: a strategy for spelling, TAPPI JOURNAL, October 1998, Vol.81(10)

English as a first and second language - part 7: a strategy for spelling, TAPPI JOURNAL, October 1998, Vol.81(10)

Journal articles
Open Access
Status of leak detection methods for recovery units in north america, TAPPI JOURNAL, October 1998, Vol.81(10)

Status of leak detection methods for recovery units in north america, TAPPI JOURNAL, October 1998, Vol.81(10)

Magazine articles
Open Access
The industry: beyond 2000, TAPPI JOURNAL, October 1998, Vol.81(10)

The industry: beyond 2000, TAPPI JOURNAL, October 1998, Vol.81(10)

Journal articles
Open Access
Steam turbine risk assessment project: inspection and overhaul optimization of steam turbines, TAPPI JOURNAL, September 1998, Vol. 81(9)

Steam turbine risk assessment project: inspection and overhaul optimization of steam turbines, TAPPI JOURNAL, September 1998, Vol. 81(9)

Journal articles
Open Access
Toward closed-cycle kraft - Canadian mill case studies, TAPPI JOURNAL, September 1998, Vol. 81(9)

Toward closed-cycle kraft - canadian mill case studies, TAPPI JOURNAL, September 1998, Vol. 81(9)

Magazine articles
Open Access
Indonesian update: a country in change, an industry in recovery, TAPPI JOURNAL, September 1998, Vol. 81(9)

Indonesian update: a country in change, an industry in recovery, TAPPI JOURNAL, September 1998, Vol. 81(9)

Journal articles
Open Access
Environmental progress at Howe Sound Pulp & Paper, TAPPI JOURNAL, September 1998, Vol. 81(9)

Environmental progress at howe sound pulp & paper, TAPPI JOURNAL, September 1998, Vol. 81(9)

Journal articles
Open Access
Design and installation of a rplacement thermal oxidizer for odor abatement, TAPPI JOURNAL, April 1999, Vol. 82(4)

Design and installation of a rplacement thermal oxidizer for odor abatement, TAPPI JOURNAL, April 1999, Vol. 82(4)

Journal articles
Open Access
Effect of the pressure difference over the screen basket on the performance of a pressure screen, TAPPI JOURNAL, April 1999, Vol. 82(4)

Effect of the pressure difference over the screen basket on the performance of a pressure screen, TAPPI JOURNAL, April 1999, Vol. 82(4)

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