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Using the Pitzer method to estimate the boiling point rise in black liquor solutions

Marta Bialik (Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik) ; Ali Moosavifar (Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik) ; Maria Sedin (Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik) ; Hans Theliander (Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik)
Nordic Pulp & Paper Research Journal (0283-2631). Vol. 24 (2009), 2, p. 172-182.
[Artikel, refereegranskad vetenskaplig]

The b.p. rise (elevation) of aq. industrial solns. is often of significant importance for the design of process conditions, equipment, heat balances, etc. However, few rigorous methods exist for predicting b.p. elevation in complex, multicomponent, electrolyte solns. An example of such a soln. is the black liquor obtained in kraft pulp prodn.: a complex mixt. of org. and inorg. ions including Na+, K+, OH-, HS-, CO32-, SO42-, S2O32-, CH3COO-, various phenolates and many more. This work shows one application of the semi-empirical Pitzer method to the theor. prediction of the b.p. rise in industrial black liquor solns. The values of the b.p. elevation were measured in two series of black liquors from representative Swedish mills, including both the original and lignin-lean black liquor at different solid contents. The results show a good agreement between exptl. and predicted values at low to moderate solid content, and good qual. prediction at high solid content.

Nyckelord: Black liquor, Boiling point rise (elevation), Electrolyte, Pitzer model/method, Activity, Osmotic coefficient

Denna post skapades 2009-11-20. Senast ändrad 2010-06-16.
CPL Pubid: 101967


Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Skogsindustriell kemiteknik (2005-2014)


Fysikalisk kemi
Pappers-, massa- och fiberteknik

Chalmers infrastruktur