Development of CO<sub>2</sub> phase change absorbents by means of the cosolvent effect

Yang, Fushen; Jin, Xianhang; Fang, Jiawei; Tu, Weiwei; Yang, Ye; Cui, Chunhua; Zhang, Weidong

doi:10.1039/c8gc00283e

Cited by 44 publications

(13 citation statements)

References 32 publications

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“…There is an ongoing discussion whether such a liquid-liquid phase separation can be used in an advantageous way in CO 2 -absorption processes [72,73,74,75,76,77,78,79,80].…”

Section: Summary Of Resultsmentioning

confidence: 99%

Triacetoneamine-derivates (EvAs) for CO2-absorption from process gases

Kessler

Ninni

Vasiliu

et al. 2020

International Journal of Greenhouse Gas Control

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New amines for reactive absorption of CO 2 from process gases were investigated in a comprehensive experimental screening. All studied amines are derivates of triacetoneamine and differ only in the substituent of the triacetoneamine ring structure. The amines are abbreviated by the acronym EvA with a consecutive number, designating the derivate. About 50 EvAs were considered in this work from which 26 were actually synthesized and investigated in aqueous solution. The mass fraction of the amines in the unloaded solution was eitherw 0 EvA = 0.05 g/g orw 0 EvA = 0.4 g/g. The following properties were studied: solubility of CO 2 , rate of absorption of CO 2 , liquid-liquid and solid-liquid equilibrium, foaming behavior, dynamic viscosity, and acid constants. The nine most promising EvAs were evaluated with the NoVa short-cut method [1]. The method yields estimates for the specific energy demand and recirculation rate for a given purification task. Two typical purification tasks were considered: the CO 2 -removal from natural gas and from synthesis gas, respectively. Some of the EvAs showed significantly improved performance compared to monoethanolamine (MEA) and a solvent-blend of methyl-diethanolamine and piperazine (MDEA/PZ).

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“…There is an ongoing discussion whether such a liquid-liquid phase separation can be used in an advantageous way in CO 2 -absorption processes [72,73,74,75,76,77,78,79,80].…”

Section: Summary Of Resultsmentioning

confidence: 99%

Triacetoneamine-derivates (EvAs) for CO2-absorption from process gases

Kessler

Ninni

Vasiliu

et al. 2020

International Journal of Greenhouse Gas Control

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“…Yang et al developed a solvent of MDEAC4–C6 alcoholH 2 O. The CO 2 cycle capacity was 70% higher than the neat MDEA solution and the corresponding absorption rates increased by 150% compared with the neat MDEA solution . Moreover, sulfolane was used as a phase splitting agent to regulate the phase separation of the conventional MEA aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Phase Splitting Agent Regulated Biphasic Solvent for Efficient CO₂ Capture with a Low Heat Duty

Jiang

Chen

Wang

et al. 2020

Environ. Sci. Technol.

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A biphasic solvent features high absorption capacity and low heat duty for CO 2 capture. Phase separation behavior is essential to cut down energy penalty. Four phase splitting agents with different hydrophobicities, such as 1,3-dimethyl-2-imidazolidinone (DMI), 1-methyl-2-pyrrolidinone (NMP), N,N-dimethylformamide, and sulfolane, were dosed to biphasic solvents, triethylenetetramine and 2-(diethylamino)ethanol. Experimental results revealed that they can tune the phase separation behavior during CO 2 absorption. Generally, under the same CO 2 loading, the volume ratio of the rich phase increased with their hydrophobicity (log P), which accounts for over 50%. Moreover, their influences on absorption capacity, kinetics, and thermodynamics were also investigated. After dosing NMP, the heat duty was decreased by 22%. Furthermore, a phase splitting agent with a positive log P was more conducive to reducing the heat duty, and one with a negative log P enhanced the absorption rate. With DMI, the absorption rate was 114% higher than that of MEA at rich loading. The 13 C NMR analysis showed that the agents were not involved in CO 2 absorption and did not affect the reaction mechanism. Furthermore, quantum calculation was used to verify the reaction mechanism, confirming that the phase splitting agent increases the reaction equilibrium constant and makes it proceed more thoroughly.

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“…In the latter system, the cycling absorption efficiency can be 97.6%. Recently, Yang et al 30 developed the MDEA/C4-C6 alcohol/H 2 O system by means of the cosolvent effect, which expanded the understanding of the phase-change mechanism. However, there are some disadvantages in the existing systems: the low boiling point of propanol, the high toxicity of sulfolane, the significant decline of absorption capacity in the MEA/DEA-heptanol/octanol system, and the relatively high price of MMEA.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Phase-Change Absorbent System MEA + Solvent A (SA) + H₂O Used for the CO₂ Capture from Flue Gas

Zhu

Liu

et al. 2019

Ind. Eng. Chem. Res.

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Amine-based CO 2 postcombustion capture is a commercialized technology for recovery CO 2 from flue gas, and the energy consumption is concentrated in the regenerative stage. The phase-change solvent system, monoethanolamine (MEA, absorbent) + solvent A (SA, solvent) + water (solvent), was investigated on the performances of CO 2 absorption and desorption. CO 2 -rich solvent can be continuously separated for the feeding flow of the regeneration tower; thereby, it significantly reduces the energy of regeneration. The results show that the solvent with suitable composition can easily separate the CO 2 -rich phase from the solvent, and the CO 2 -rich phase accounts for more than 98% of the total CO 2 . At 293−333 K, the temperature has no significant effect on the absorption rate and phase equilibrium. The estimation of energy consumption shows that the reboiler work can be reduced by 43.6% compared with that using 20 wt % MEA aqueous solution.

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Development of CO₂ phase change absorbents by means of the cosolvent effect

Abstract: Development of CO2 phase change absorbents comprising MDEA/C4–C6 alcohol/H2O by means of the cosolvent effect.

Cited by 44 publications

References 32 publications

Triacetoneamine-derivates (EvAs) for CO2-absorption from process gases

Triacetoneamine-derivates (EvAs) for CO2-absorption from process gases

Phase Splitting Agent Regulated Biphasic Solvent for Efficient CO₂ Capture with a Low Heat Duty

Investigation on the Phase-Change Absorbent System MEA + Solvent A (SA) + H₂O Used for the CO₂ Capture from Flue Gas

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Development of CO2 phase change absorbents by means of the cosolvent effect

Abstract: Development of CO2 phase change absorbents comprising MDEA/C4–C6 alcohol/H2O by means of the cosolvent effect.

Cited by 44 publications

References 32 publications

Triacetoneamine-derivates (EvAs) for CO2-absorption from process gases

Triacetoneamine-derivates (EvAs) for CO2-absorption from process gases

Phase Splitting Agent Regulated Biphasic Solvent for Efficient CO2 Capture with a Low Heat Duty

Investigation on the Phase-Change Absorbent System MEA + Solvent A (SA) + H2O Used for the CO2 Capture from Flue Gas

Contact Info

Product

Resources

About

Development of CO₂ phase change absorbents by means of the cosolvent effect

Phase Splitting Agent Regulated Biphasic Solvent for Efficient CO₂ Capture with a Low Heat Duty

Investigation on the Phase-Change Absorbent System MEA + Solvent A (SA) + H₂O Used for the CO₂ Capture from Flue Gas