Study On Absorption Performance Of CO₂ In MEA Promoted K₂CO₃ Aqueous Solutions

The absorption capacity and CO₂ loading in monoethanolamine?MEA?promoted potassium carbonate?K₂CO₃?aqueous solutions were measured at normal pressure.The temperatures ranged from 333.2K to 353.2K.The mass fractions of K₂CO₃ and MEA respectively ranged from 0.30 to 0.35 and 0 to 0.06.The 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 absorption rate were illustrated.Our results show that:?1?The absorption capacity of CO₂ respectively increases decreases with increasing mass fraction of absorbent and increasing temperature,while the CO₂ loading decreases with the increase of both mass fraction of absorbent and increasing temperature;?2?MEA can promote the absorption rate of CO₂.When the mass fractions of MEA are of small values,the absorption rate of CO₂ can be promoted very significantly;?3?The absorption rate of CO₂ increases with increasing temperature and increasing solution concentration;?4?At given mass fraction of K₂CO₃?0.3?,the optimal mass fractions of the additive are around 0.045-0.060,under which both high absorption rate and large CO₂ loading can be achieved simultaneously.