Recovery of kraft black liquor using the titanate process: kinetics of the direct causticization reaction between sodium tri-titanate and sodium carbonate
1999 (English)Licentiate thesis, comprehensive summary (Other academic)
The solid state reaction between sodium tri-titanate and sodium carbonate, forming mainly sodium penta-titanate, was investigated. Experiments were carried out in a micro-differential reactor made of quartz glass at various temperatures between 800°C and 880°C and in a pilot fluidized bed reactor operated in a semi-batch mode. In the micro-differential reactor, basic kinetic data was obtained by measuring the release of carbon dioxide during the reaction. Different kinetic models were considered to describe the conversion, such as the Valensi-Carter model for diffusion controlled reaction rates and the phase-boundary model for first-order reaction kinetics. Furthermore, a model that included both diffusion in the solid material and the chemical kinetics was derived. This model described the experimental data obtained in the micro-differential reactor very well. Finally, rating models describing the conversion obtained in a fluidized bed and in an entrained flow reactor were developed.
Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 1999. , 72 p.
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757 ; 1999:45
Research subject Chemical Technology
IdentifiersURN: urn:nbn:se:ltu:diva-18189Local ID: 759678b0-e1d9-11db-b0f8-000ea68e967bOAI: oai:DiVA.org:ltu-18189DiVA: diva2:991196
Godkänd; 1999; 20070403 (ysko)2016-09-292016-09-29Bibliographically approved