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The equilibrium solubility of carbon dioxde and hydrogen su-
lfide in aqueous mixtures of monoethanolamine(MEA) with
methyld- iethanolamine(MDEA) has been correlated on the basis
of the met- hod of Deshmukh and Mather. The extended Debye-
Huckel expression given by Guggenheim has been used to
calculate the activity co- efficients of both ions an
dmolecules inivolved in the solution. The fugacity
coefficients of the acid gas were determined using the Peng-
Robinson equation of state. The interaction parameters among
pair species were determined from the vapor-liquid equili- um
data. The data base used in this study are MEA/MDEA/H2O/H2S/
CO2 from literatures at temperatures ranging from 40 to
100℃, pressures ranging from 0.8-1000kPa, concentrations of
MEA rangi- ng from 0.5 to 5N and MDEA ranging from 1 to 4.2N.
Statisfactory results were obtained for calculation of the
solubility of carb- on dioxide and hydrogen sulfide in
aqueous MEA/MDEA solutions tested. When performing the vapor-
liquid equilibrium calculatio- ns for the systems which are not
included in the data base, the correlation yields reasonably
well results. The correlation obt- ained in this study can be
used as a computation tool for the vapor-liquid equilibrium
calculations for designing the acid ga- ses process using the
aqueous MEA/MDEA solution as the absorpti- on fluid.
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