On the Development of a Modified Nonelectrolyte NRTL-NRF Model for Strong and Weak Electrolyte Solutions

The non-electrolyte NRTL-NRF model has been modified to study electrolyte solutions. The modified model for electrolytes is composed of short-range parts expressed by the modified nonelectrolyte NRTL-NRF and the Pitzer-Debye-Hückel equation to represent the long-range interactions of ions in the solution. In this work, a salt-specific parameter is used. Various types of experimental data including binary and ternary activity and osmotic coefficients, solid and gas solubilities in aqueous NaCl, and also aqueous Methyldiethanolamine  (MDEA) data at wide temperature and pressure ranges have been implemented to check the performance of the present model. The overall relative standard deviation of ۰.۰۴۶ has been achieved for ۱۳۰ strong aqueous binary electrolytes by the new model in fitting the experimental data of activity coefficients. The percent of absolute average deviations of the modified model for CO۲+ MDEA+ H۲O andH۲S+ MDEA+ H۲O is ۳۰.۳% and ۲۴.۸%, respectively. The results show the good capabilities of the model for electrolyte solutions.

کلیدواژه ها:

Modified N-NRTL-NRF ، Electrolyte ، Activity ، osmotic ، aqueous MDEA