Solubility of Methane in Aqueous Solutions of 2-(2-Aminoethoxy)ethanol

In this study experimental data are presented for the solubility of methane in 3.0 and 6.0 kmol/m3 (30.5 and 59.5 wt %) solutions of 2-(2-aminoethoxy)ethanol (which is also called diglycolamine). Temperatures in this study ranged from 25 to 125 °C and pressures to 13 MPa. The data were incorporated into a rigorous thermodynamic model that has been applied to other similar systems. The new data were then compared with the data available in the literature. In pure water and low amine concentrations it is demonstrated that the isobaric solubility exhibits a minimum. However, for high amine concentration there is a somewhat surprising resultthe isobaric solubility is an increasing function of temperature over the range of temperature studied here.