Phase equilibrium measurements and thermodynamic modeling of aqueous solutions of polyamines CO2 absorbents: 3-aminopropylmethylamine, 3-aminopropyldimethylamine and N,N-diethyl 1,3-propanediamine at temperatures from 273 K to 363 K

• Experimental vapor pressures of pure MAPA, DMAPA, DEAPA and their aqueous solutions are reported.
• The investigated temperatures are 273 K through 363 K.
• The MAPA binary system exhibits negative deviations in GE values.
• The DMAPA and DEAPA systems exhibit negative, sinusoidal and positive deviations in GE values.
• The 3rd order Redlich–Kister, and NRTL or UNIQUAC models have been used to correlate the (P-x-y) data.

The vapor pressures of the pure components 3-aminopropylmethylamine (MAPA), 3-aminopropyldimethylamine (DMAPA) and N,N-diethyl 1,3-propanediamine (DEAPA) along with the binary mixtures (MAPA + water), (DMAPA + water) and (DEAPA + water) were measured by means of a static apparatus at temperatures between (273 and 363) K. The data were correlated with the Antoine equation. From these data, excess Gibbs functions (GE) were calculated for several constant temperatures, and fitted to a three parameters Redlich–Kister equation using the Barker’s method. Additionally, the NRTL and UNIQUAC models have been used for the correlation of the total pressure.

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