Enhancement of CO₂ capture performance of aqueous MEA by mixing with [NH₂e-mim][BF₄]

Abstract

Alcohol amine solutions have a high absorption capacity and rate for CO 2 capture, however, there are some shortcomings such as high energy-consumption and low stability. To enhance CO 2 capture performance of aqueous MEA, a functional ionic liquid ([NH 2 e-mim][BF 4 ]) was introduced based on the advantages for CO 2 capture. Absorbents were prepared with the molar concentration ratio of [NH 2 e-mim] [BF 4 ] to the 30 vol% aqueous MEA of 0 : 10, 1 : 9, 2 : 8, 3 : 7, 4 : 6 and 6 : 4. The density and the viscosity of the investigated absorbents were measured and the effects of the molar fraction of [NH 2 e-mim][BF 4 ] (n I ) and temperature on CO 2 absorption performance were investigated. CO 2 desorption performance of the solvent at different temperatures was discussed. The stability performance of the absorbent with n I of 2 : 8 (I/M 2:8 ) was examined by five consecutive cyclic tests. The results showed that for pure CO 2 , the I/M 2:8 displayed the highest absorption performance at 303 K under 1 bar: a comparable CO 2 absorption capacity of the 30 vol% aqueous MEA and a higher CO 2 absorption rate at the later absorption stage.Moreover, with the increase of temperature, CO 2 absorption capacity and rate decreased, while CO 2 desorption efficiency and rate increased. 393 K was chosen as the optimum desorption temperature with the desorption efficiency of 99.31%. The introducing of IL contributed to CO 2 desorption performance of the absorbents significantly. The properties (CO 2 absorption capacity, mass loss, density and viscosity) of the I/M 2:8 during the cycles suggested that the IL-MEA mixture had an excellent stability performance.

Kinetic Study of CO2 Hydration by Small-Molecule Catalysts with A Second Coordination Sphere that Mimic the Effect of the Thr-199 Residue of Carbonic Anhydrase

“…For capturing CO 2 , amine-based chemosorbents, which are expected to be the first material to be commercialized, are currently under investigation [3][4][5][6][7]. However, these chemosorbents have certain drawbacks, in that they require a high amount of heat for regeneration, are corrosive, and undergo deterioration [8][9][10]. Therefore, it is necessary to investigate CO 2 capture and storage technologies in order to explore new concepts capable of overcoming the limitations of the existing absorbent.…”

Promotion of CO2 capture performance using piperazine (PZ) and diethylenetriamine (DETA) bi‐solvent blends

“…However, most of the current research regarding amine solutions focuses on the unilateral performance of the absorbant. Some researchers find new amine solutions with low regeneration energy, but their high viscosity causes slow absorption rates; some may find highly efficient amine solutions while their operating cost is too expensive . There is thus a need for a new amine solution that has a high absorption rate and capacity, low regeneration energy consumption, and excellent cycle performance.…”

“…Some researchers find new amine solutions with low regeneration energy, but their high viscosity causes slow absorption rates; 23,24 some may find highly efficient amine solutions while their operating cost is too expensive. 25 There is thus a need for a new amine solution that has a high absorption rate and capacity, low regeneration energy consumption, and excellent cycle performance. Moreover, existing studies about mixed amines lack experimental data on absorption enthalpy; most studies obtain the absorption enthalpy of mixed amines by weighting the absorption enthalpies of single amines, which may cause a certain deviation in calculating regeneration energy consumption.…”

Modeling study of the heat of absorption and solid precipitation for CO2capture by chilled ammonia

“…[7][8][9] In post-combustion capture, alkanolamine solutions, monoethanolamine (MEA) in particular, act as CO 2 absorbents with high reaction rates. [10][11][12] However, amine-based capture suffers from corrosion and high operating cost, including absorbent degradation and relatively high energy consumption. These drawbacks greatly hinder its wide deployment in the electric power industry.…”