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Absorption capacity and CO2 removal efficiency in tray tower by using 2-(ethylamino)ethanol activated 3-(dimethylamino)propan-1-ol aqueous solution

Kun Fu,Pan Zhang,Dong Fu

The absorption amount ( m ) and loading ( α ) of CO 2 in 2-(ethylamino)ethanol (EAE) activated 3-(dimethylamino)propan-1-ol (3DMA1P) aqueous solution were measured. The temperatures ranged from 303.2 K to 323.2 K. The mass fractions of 3DMA1P and EAE respectively ranged from 0.3 to 0.5 and 0.01 to 0.03. The effects of temperature ( T ) and mass fractions of amines ( w ) on the absorption performance were illustrated. It’s impressive that the addition of very small amounts of EAE into 3DMA1P aqueous solution significantly enhanced the absorption performance. Moreover, comparison showed that 3DMA1P-EAE aqueous solution appeared much higher CO 2 absorption capacity than the widely used MDEA-MEA aqueous solution. Tray towers with different plates ( N p  = 6, 8 and 10) were used to verify the removal efficiency of CO 2 ( η CO 2 ${\eta }_{{\text{CO}}_2}$ ) and the effects of gas flow rate ( G ), absorbent flow rate ( L ), w , absorbent feed temperature ( T ) and N p on η CO 2 ${\eta }_{{\text{CO}}_2}$ were illustrated. Our results showed that when composed of 30% to 50% (mass percent) 3DMA1P and 3% EAE, the absorbents achieved η CO 2 ${\eta }_{{\text{CO}}_2}$ higher than 90%, which met the efficiency requirement specified in a power plant, thus leading to a promising industrial application in the CO 2 capture process.