Study On The Absorption Performance And Viscosity Of CO₂ In Mixed Amine Solutions

In this work,the absorption capacity and loading and the viscosities of CO₂ in2-amino-2-methyl-1-propanol（AMP）promoted 2-（diethylamino）ethanol（DEAE）aqueous solution were studied at atmospheric pressure.The temperatures were respectively303.2K,313.2Kand323.2K.Themassfractionsof2-（diethylamino）ethanol(w_DEAE)were respectively 0.30 and 0.40.The mass fractions of 2-amino-2-methyl-1-propanol(w _AMP)were respectively 0.00,0.05,0.10 and 0.15.The apparent absorption rates were determined by using the experimental data of the time-dependent absorption capacities.The effects of temperature and solution concentration on the absorption capacity,CO₂ loading and apparent absorption rate were illustrated.The viscosities were modeled by using the Weiland equation.The effects of temperature and mass fraction on viscosities were demonstrated.The results indicate that:（1）At given temperature,the absorption capacity and the apparent absorption rate both increase with increasing mass fraction of absorbent,while the loading decreases with the increasing mass fraction of absorbent;（2）At given mass fraction of absorbent,the absorption capacity of CO₂ and CO₂loading decrease with increasing temperature,while the apparent absorption rate increases with increasing temperature;（3）The viscosity of DEAE-AMP aqueous solutions respectively increases and decreases with increasing mass fraction and temperature;（4）The Weiland equation can correctly correlate and predict the viscosity of DEAE-AMP absorption solution and the calculated values are in good agreement with the experimental data;（5）The apparent absorption rate increases with increasing solution concentration and temperature.However,the increase of solution concentration leads to higher solution viscosity,thus may decrease the absorption rate.