Non-ideality of Solutions of NH3, SO2, and H2S in Ionic Liquids and the Prediction of Their Solubilities Using the Flory-Huggins Model

abstract

The non-ideality of solutions of light compounds, such as SO2, NH3, and H2S, in ionic liquids (ILs) is studied here using experimental vapor-liquid equilibrium (VLE) data previously published. The data available for systems of ILs with SO2, NH3, and H2S show that these systems present negative deviations to the ideality in the liquid phase and that these deviations are dominated by entropic effects. It is shown here that, for the solutions of SO2 and NH3 in ILs, the deviations from ideality and the gas solubility can be predicted using the Flory-Huggins model. For H2S, a positive deviation to the non-ideality that arises from the enthalpic effects somewhat decreases the quality of the description of the experimental data by the Flory-Huggins model predictions.

keywords

HIGH-PRESSURE DENSITIES; THERMODYNAMIC PROPERTIES; 1-N-BUTYL-3-METHYLIMIDAZOLIUM HEXAFLUOROPHOSPHATE; DEEP DESULFURIZATION; HYDROGEN-SULFIDE; SULFUR-DIOXIDE; CARBON-DIOXIDE; MIXTURES; CO2; EQUILIBRIA

subject category

Energy & Fuels; Engineering

authors

Carvalho, PJ; Coutinho, JAP

our authors

acknowledgements

The authors are thankful for financial support front Fundacao para a Ciencia e a Tecnologia (Project PTDC/EQU-FTT/102166/2008). Pedro J. Carvalho acknowledges the financial support from Fundacao para a Ciencia e a Tecnologia through his Ph.D. scholarship (SFRH/BD/41562/2007).

Share this project:

Related Publications

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".