Abstract
The phase equilibira and surface tensions of N-methyldiethanolamine (MDEA), diethanolamine (DEA) and their aqueous solutions were investigated by using the perturbed-chain statistical associating fluid theory (PC-SAFT) and density-gradient theory (DGT). The molecular parameters and influence parameter were respectively regressed by fitting to the experimental data of phase equilibria and surface tensions of pure fluids. With the molecular parameters and influence parameter as input, the surface tensions of MDEA, DEA and their aqueous solutions were correlated satisfactorily.
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