On the application of NRTL-NRF model for modeling of activity coefficient of electrolyte solutions and solubility of acid gases in alkanolamines

Nonelectrolyte NRTL-NRF (NNN) model is used for short range contribution of excess Gibbs free energy of electrolyte solutions. Long range contribution is represented by Pitzer-Debye-Hückel model. In the first step of this work, the present model is applied to correlation of mean activity coefficients of more than 20 strong aqueous electrolyte solutions which has two adjustable parameters per each electrolyte. The results of this part are compared with the electrolyte-NRTL and electrolyte-NRTL-NRF models. In the second step, the activity coefficient model is adopted to correlation solubility of acid gases in alkanolamines. . The results for the MDEA-H2O-CO2 and MDEA-H2O-H2S systems demonstrate that the NRTL-NRF model can correlate the data very well and also the model is successful to study thermodynamic properties ofelectrolyte solutions.

کلیدواژه ها:

local composition model ، Nonelectrolyte NRTL-NRF (NNN) model ، electrolyte ، acid gases ، alkanolamine