thermodynamic modeling of vapor-liquid equilibrium of aqueous n-methyldiethanolamine solution using n-nrtl-nrf model

One of the chemical solvents which are widely used in the oil, gas, and chemical industries is the n-methyldiethanolamine (mdea)# the blending of mdea with water especially uses in the natural gas sweetening and power plant flue gas treatment for the absorption of carbon dioxide and hydrogen sulfide# in this work the nonelectrolyte nrtl nonrandom factor (n-nrtl-nrf) model that is one of the local composition activity coefficient models is used to correlate the vapor-liquid equilibrium (vle) of the binary aqueous mdea solution at the various condition# also, to check the power of the model for prediction of the other properties of this aqueous mixture, the excess enthalpy of this system at 298#15 k, 101#3 kpa, and whole range of composition is predicted# the results show that the n-nrtl-nrf model can describe the vapor-liquid equilibrium of binary aqueous mdea solution very well and in following predict the excess enthalpy excellently# the vapor-liquid equilibrium and excess enthalpy are two major properties for industrial applications such as for the design of the process equipment#