Ionic liquids tailored amine aqueous solution for pre-combustion CO2 capture: Role of imidazolium-based ionic liquids

Gao, Jubao; Cao, Lingdi; Dong, Haifeng; Zhang, Xiangping; Zhang, Suojiang

doi:10.1016/j.apenergy.2015.05.073

Cited by 91 publications

(40 citation statements)

References 55 publications

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“…Ionic liquids (ILs) have emerged as potential solvents for gas separation (Zhang et al, 2013;Gao et al, 2015;Cao et al, 2017;Shang et al, 2017;Zhu et al, 2017) due to their outstanding properties, such as high thermal stability, low heat capacity, negligible vapor pressure and adjustable nature. ILs as CO 2 absorbents is one of the most effective alternatives to replace conventional aqueous alkanolamines solvents.…”

Section: Introductionmentioning

confidence: 99%

Protic ionic liquids with low viscosity for efficient and reversible capture of carbon dioxide

Bai

Zeng

et al. 2019

International Journal of Greenhouse Gas Control

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Protic ionic liquids (PILs) are considered as potential solvents for CO 2 capture due to their simple synthetic routes and unique properties. In this work, three low viscous PILs, tetramethylgunidinium imidazole ([TMGH][Im]), tetramethylgunidinium pyrrole ([TMGH][Pyrr]) and tetramethylgunidinium phenol ([TMGH][PhO]) were synthesized and the effect of anions, temperature, CO 2 partial pressure and water content on CO 2 absorption performance of PILs was also systematically studied. It was found that the PILs with larger basicity show higher CO 2 absorption capacity, and [TMGH][Im] simultaneously shows relatively high absorption rate and CO 2 absorption capacity of 0.154 g CO 2 /g IL at 40 ℃, 1 bar. The addition of H 2 O has a positive effect on gravimetric absorption capacity of CO 2 at the range of 0-20 wt% H 2 O, and the highest capacity of 0.186 g CO 2 /g IL was achieved as the water content was 7 wt%. In-situ FTIR, 13 C NMR and theoretical calculations verified that more stable bicarbonate are produced during CO 2 absorption by [TMGH][Im]-H 2 O system. However, neat [TMGH][Im] can react with CO 2 to form the reversible carbamate, leading to excellent recyclability after four absorption-desorption cycles. The results implied that neat [TMGH][Im] shows great potentials in CO 2 absorption applications.

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Section: Introductionmentioning

confidence: 99%

Protic ionic liquids with low viscosity for efficient and reversible capture of carbon dioxide

Bai

Zeng

et al. 2019

International Journal of Greenhouse Gas Control

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“…In order to identify cost-effective approaches for CO 2 capture, new materials and techniques have been studied [1,8,[14][15][16][17][18]. In particular, phase change solvents, a new class of solvents, have emerged and been developed into one of the most promising technologies for CO 2 capture.…”

Section: Introductionmentioning

confidence: 99%

Phase change amino acid salt separates into CO2-rich and CO2-lean phases upon interacting with CO2

et al. 2016

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Concerns over global climate change have led to strong research emphasis worldwide on reducing the emission of greenhouse gases like CO 2 . One avenue for carbon emission reduction is using CO 2 capture and storage from industrial sources. Having low toxicity and low vapor pressure and being resistant to oxidation, natural amino acids could be a better choice over current carbon capture materials. In this study, we pioneered a unique phase change amino acid salt solvent concept in which amino acid salt solution was turned into a CO 2 -rich phase and a CO 2 -lean phase upon simple bubbling with CO 2 and most importantly, this solution captured the most CO 2 (~90%) in the CO 2 -rich phase. Bicarbonate was found to be dominant in the CO 2 -rich phase, which had a high CO 2 loading capacity and good regenerability and cycling properties. Such a phase change amino acid salt solvent may provide unique solutions for industries to reduce CO 2 and other harmful emissions.

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“…As an alternative CCS method to two major existing technologies, namely chemical absorption 13 , 14 , which can be toxic and harmful to the ecosystem, and membrane separation 15 , 16 necessitating frequent maintenance and accordingly high cost, hydrate-based gas separation is one burgeoning technology. Moreover, CO 2 capturing by hydrate-based gas separation has comparable to or even lower energy consumption than chemical absorption or membrane separation 17 .…”

Section: Introductionmentioning

confidence: 99%

Crystal growth of clathrate hydrate formed with H2 + CO2 mixed gas and tetrahydropyran

Maruyama

Matsuura

Ohmura

2021

Sci Rep

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Hydrate-based gas separation technology is applicable to the CO2 capture and storage from synthesis gas mixture generated through gasification of fuel sources including biomass. This paper reports visual observations of crystal growth dynamics and crystal morphology of hydrate formed in the H2 + CO2 + tetrahydropyran (THP) + water system with a target for developing the hydrate-based CO2 separation process design. Experiments were conducted at a temperature range of 279.5–284.9 K under the pressure of 4.9–5.3 MPa. To simulate the synthesis gas, gas composition in the gas phase was maintained around H2:CO2 = 0.6:0.4 in mole fraction. Hydrate crystals were formed and extended along the THP/water interface. After the complete coverage of the interface to shape a polycrystalline shell, hydrate crystals continued to grow further into the bulk of liquid water. The individual crystals were identified as hexagonal, tetragonal and other polygonal-shaped formations. The crystal growth rate and the crystal size varied depending on thermodynamic conditions. Implications from the obtained results for the arrangement of operating conditions at the hydrate formation-, transportation-, and dissociation processes are discussed.

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Ionic liquids tailored amine aqueous solution for pre-combustion CO2 capture: Role of imidazolium-based ionic liquids

Cited by 91 publications

References 55 publications

Protic ionic liquids with low viscosity for efficient and reversible capture of carbon dioxide

Protic ionic liquids with low viscosity for efficient and reversible capture of carbon dioxide

Phase change amino acid salt separates into CO2-rich and CO2-lean phases upon interacting with CO2

Crystal growth of clathrate hydrate formed with H2 + CO2 mixed gas and tetrahydropyran

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