Practical Thermodynamic Model for Acidic Sulfate Solutions

Sippola, Hannu; Kobylin, Petri; Taskinen, Pekka

doi:10.1002/9781118679401.ch17

Cited by 2 publications

(1 citation statement)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The K 2 equation obtained in this work will also be tested in the future with new NPL Pitzer model, which has been shown to be capable to model sulfuric acid up to 80 wt % sulfuric acid 51 and predict the solubility of FeSO 4 in aqueous sulfuric acid solution up to anhydrous FeSO 4 59 We also encourage other modelers to test our new K 2 equation.…”

Section: ■ Conclusionmentioning

confidence: 88%

Thermodynamic Properties of Aqueous Sulfuric Acid

Sippola

Taskinen

2014

J. Chem. Eng. Data

Self Cite

View full text Add to dashboard Cite

Thermodynamic properties of aqueous sulfuric acid were modeled with the Pitzer equation. Both the second dissociation constant K 2 for sulfuric acid and the Pitzer parameters were fitted simultaneously. The most accurately considered experimental data including electrochemical cell, osmotic, enthalpy, and vapor pressure data at temperature range (0 to 170) °C were used in the assessment. After variations of the used experimental data and the temperature dependency of the Pitzer parameters, the thermodynamic values for the bisulfate dissociation in aqueous sulfuric acid at 25°C were re-evaluated. The obtained values for the dissociation reaction are (11.00 ± 0.27) and (25.11 ± 0.80) kJ·mol–1 for Gibbs energy and enthalpy change, respectively, yielding to 0.0119 for K 2. The obtained thermodynamic values for the cell reactions are in good agreement with CODATA and NBS literature values as well as with other Pitzer based thermodynamic models for aqueous sulfuric acid. The best model selected by using the obtained new thermodynamic data was further tested and compared to the recent Pitzer models with excellent agreement as well as with good extrapolating capabilities with respect to temperature and acid concentration. The total number of fitted terms in Pitzer parameters is eight.

show abstract

Section: ■ Conclusionmentioning

confidence: 88%