Redlich-kwong equation of state used for prediction phase data

Abstract EN

The solubility of CO2 in the non-volatile compounds of n-Hexadecane, Diphenylmetnane, Diphenyl ethane, Ethyl benzene and of Nitrogen in n-Hexadecane, at temperature range 298.15-358.15 K are measured at partial pressure of one atmosphere, Falling-film flow technique was used in the present experimental work.

It is seen that in most cases the solubility is decreased at the temperature increased, though in the case of the Nitrogen / n-Hexadecane system the reverse is true.

The effect is probably related to the decrease in solvent density which occurs as the temperature raises.

For systems of low Solubility, this effect tends to counter balance the increase tendency for solute molecules to "escape" from the solvent, arising from their increase kinetic energy.

In addition, the binary interaction constant (LAB) was calculated by fitting the mole fraction solubility of solute gases CO2 and N2 by using Redlich-Kwong equation of state for predicting phase data.

The interaction constant LAB was calculated from the following expression : LAB = 1-aAB (aA aB)-0.5…………(1).