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Thermodynamic modeling of the stability and melting properties of sodium borates relevant to black liquor combustion and gasification

  • Daniel Lindberg , Rainer Backman and Mikko Hupa
Published/Copyright: May 23, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 98 Issue 10

Abstract

The use of borates as an autocausticizing agent in kraft recovery boilers of pulp mills is an interesting concept for decreasing the lime consumption at pulp mills. The main autocausticizing reaction is between NaBO2and Na2CO3 forming Na3BO3 and CO2 at high temperatures in a liquid phase in the recovery boiler. The thermodynamic and phase equilibrium data of the Na2CO3 – NaBO2 – Na3BO3 system were evaluated and optimized. The liquid phase was modeled with the modified quasichemical model. The thermodynamic database obtained can be used to calculate the phase equilibrium and thermodynamic properties of multicomponent sodium salt mixtures of importance for the borate autocausticizing concept. The thermodynamic database is a part of an extensive thermodynamic database for alkali salt mixtures of importance for black liquor combustion in the pulp and paper industry.

Keywords: Thermodynamic modeling; Modified quasichemical model; Borate autocausticizing; Black liquor combustion
* Correspondence address, Daniel Lindberg, D. Sc. (Tech.), researcher, Åbo Akademi, Laboratory of Inorganic Chemistry, Biskopsgatan 8, FI-20500 Turku, Finland, Tel.: +358 2 215 4761, Fax: +358 2 215 4962, E-mail:

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Received: 2007-4-23
Accepted: 2007-7-10
Published Online: 2013-05-23
Published in Print: 2007-10-01

© 2007, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.101559
Keywords for this article
Thermodynamic modeling; Modified quasichemical model; Borate autocausticizing; Black liquor combustion

Articles in the same Issue

  1. Contents
  2. Contents
  3. Basic
  4. Modeling short-range ordering in solutions
  5. 3D-representation of phase and property diagrams in multi-component systems
  6. Constrained Gibbs energy minimisation
  7. The thermochemistry library ChemApp and its applications
  8. SimuSage – the component library for rapid process modeling and its applications
  9. An assessment of the ordered phases in Mn–Ni using two- and four-sublattice models
  10. Thermodynamic assessment of the Al–Li system
  11. Detailed phase diagram mapping: T–X data for solidi and liquidi of the alloy system manganese–carbon
  12. Applied
  13. Thermodynamic aspects of liquid phase sintering of SiC using Al2O3 and Y2O3
  14. Thermodynamic modeling of the B2O3–SiO2 and B2O3–Al2O3 systems
  15. Applications of thermodynamic modeling in copper converting operations
  16. Thermodynamic treatment of uranium dioxide based nuclear fuel
  17. Thermodynamic modeling of the stability and melting properties of sodium borates relevant to black liquor combustion and gasification
  18. Thixoforming of non-dendritic AA6061 feedstock produced by low superheat casting with and without a cooling slope
  19. Comparative thermodynamic study and phase equilibria of the Bi–Ga–Sn ternary system
  20. Grain growth in materials with mobile second-phase particles
  21. Notifications
  22. DGM News
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