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

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          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 NaBO 2and Na 2CO 3 forming Na 3BO 3 and CO 2 at high temperatures in a liquid phase in the recovery boiler. The thermodynamic and phase equilibrium data of the Na 2CO 3 – NaBO 2 – Na 3BO 3 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.

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          Author and article information

          Journal
          ijmr
          International Journal of Materials Research
          Carl Hanser Verlag
          1862-5282
          2195-8556
          2007
          : 98
          : 10
          : 1012-1018
          Affiliations
          a Åbo Akademi Process Chemistry Centre, Åbo Akademi University, Turku, Finland
          b Energy Technology and Thermal Process Chemistry, Umeå University, Umeå, Sweden
          Author notes
          [* ] 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: daniel.lindberg@ 123456abo.fi
          Article
          MK101559
          10.3139/146.101559
          © 2007, Carl Hanser Verlag, München
          Page count
          References: 28, Pages: 7
          Product
          Categories
          Applied

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