Low pressure solubilities of CO2 in five fatty amine polyoxyethylene ethers

• The CO2 solubility in five fatty amine polyoxyethylene ethers (FAPEs) has been reported.
• The experimental data were reduced to Henry’s law constants.
• The Gibbs free energy, enthalpy and entropy changes were calculated.
• Relationship between solubility and structure of FAPE was developed.
• The solubilities of CO2 and thermodynamic properties of dissolution in FAPEs, ILs and other surfactants were compared.

The solubilities of CO2 in five fatty amine polyoxyethylene ethers (FAPEs) with different chain lengths were determined over the pressure from P = (100 to 550) kPa and T = (303.15, 313.15 and 323.15) K using isochoric saturation method. Henry’s constants and the thermodynamic properties such as the standard Gibbs free energy, enthalpy, and entropy changes of CO2 solvation were obtained from the correlation of experimental solubility data. It indicates that CO2 solubility increases with increasing oxyethylene (EO) content of the polyoxyethene ether. Henry’s constant based on mole fraction and the molality of CO2 in FAPE-1815 vary from (1.51 to 2.25) MPa and (1.49 to 2.15) MPa from T = (303.15 to 323.15) K, respectively.