Experimental And Model For The Surface Tensions Of PZ And Ionic Liquids Promoted AMP Aqueous Solutions

Surface tension is very important for the absorption of CO2 in amine aqueous solution. It significantly affects the absorption efficiency because both the penetration of CO2 molecules from the gas phase to the liquid phase and the enhancement of the absorption are closely related to it.In this work, the surface tensions of piperazine(PZ) and ionic liquids(ILs) promoted 2-amino-2-methyl-1-propanol(AMP) aqueous solutions were investigated. The BZY-1 surface tension meter was used to measure the surface tensions of ILs-AMP aqueous solutions, CO2-unloaded and CO2-loaded AMP-PZ aqueous solutions. A thermodynamic model was proposed to correlate the surface tensions. The effects of temperature, CO2 loading and the mass fractions of amines and ILs on the surface tensions were demonstrated on the basis of experiments and calculations. Our result show that:1) For both the CO2-unloaded and CO2-loaded AMP-PZ aqueous solutions, the surface tensions decrease with the increase of amine concentration and temperature;2) For the CO2-loaded AMP-PZ aqueous solutions, the increase of CO2 loading tends to increase the surface tensions at given amine concentration;3) For ILs promoted AMP aqueous solutions, the surface tensions decrease with the increase of amine concentration, ILs concentration and temperature;4) The proposed model correctly captures the effects of temperature, mass fraction of amines and CO2 loading on the surface tensions, and the calculated results agree well with the experimental data.