Test of CO2 absorption capacity

https://doi.org/10.3390/en14206822

“In the present work, a CO₂ absorption capacity was measured and reported in terms of CO₂ loading (mol CO₂/mol amine). For this experiment, 25 mL of a desired amine concentration was loaded into an absorption reactor, which was well immersed in a temperature-controlled water bath (WD11, Hanyang Scientific Equipment Co., Ltd, Korea) with an operating range of 303–373 K and a temperature stability of ± 0.2 °C. CO₂ and N2 gaseous streams were mixed and fed (with total flow rate of 1 L/min) to the saturation cell and then the absorption reactor at atmospheric pressure. Concentration of CO₂ in the mixed gas stream was adjusted by gas flow controllers of CO₂ and N2 and validated with CO₂ gas analyzer with accuracy of ± 0.3% (SprintIR-6S100%, CO₂ METER, Canada). In this study, the CO₂ concentration was set at 10% v/v, which well corresponds with the CO₂ concentration from an exhausted gas stream from a fossil fired power generation plant. After CO₂ reacting with amine in the absorption reactor, 1 mL of the amine sample was taken to determine CO₂ loading by titrating with 1 M HCl standard solution using Chittick apparatus [16]. This procedure was repeatedly done every 1 h until the CO₂ loading was constant (in other words, the system reached equilibrium), which took 4–6 h depending on the PZ/MPDL concentration ratio. The equilibrium CO₂ loading was then reported as CO₂ absorption capacity. The experimental procedure and the experimental set-up for determining CO₂ absorption capacity were validated with 14 %wt. MEA and 30 %wt. MEA at 313 K. It was found that the absorption capacity measured in the present study are well corresponding with those of literatures [17], [18] with AADs of 0.87% and 2.75%, respectively.”