Mass transfer characteristics of CO 2 absorption into a phase-change solvent in a wetted-wall column

Wang, Li Dong; An, Shanlong; Yu, Shengwen; Zhang, Shihang; Zhang, Yifeng; Li, Meng; Li, Qiangwei

doi:10.1016/j.ijggc.2017.08.001

Cited by 49 publications

(25 citation statements)

References 33 publications

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“…The formation of a two-liquid phase can not only reduce the sensible heat significantly but also the latent heat because only the CO 2 -enriched phase is required to be regenerated. However, for the conventional biphasic solvent, with the CO 2 absorption, the tertiary amine gradually transferred from the upper phase to lower phase to participate in CO 2 absorption, resulting in an increase of the lower phase volume ratio. − Therefore, beyond a critical CO 2 loading, the two liquid phases shifted to a one homogeneous liquid phase again . In other words, this makes the biphasic solvents lose their beneficial properties at the high CO 2 loading, which hindered the reduction of regeneration energy consumption.…”

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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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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“…Wang et al 58 investigated 1 M DETA/4 M DEEA with respect to mass transfer characteristics in a wetted wall column. Species analysis shows that the main species in the upper phase solvent is DEEA.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Phase-Change Solvents and Processes for Postcombustion CO₂ Capture: A Detailed Review

Παπαδόπουλος

Tzirakis

Tsivintzelis

et al. 2019

Ind. Eng. Chem. Res.

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This work reviews research activities in the development of phase-change CO2 capture solvents and processes. The focus is on liquid–liquid phase-change solvents in which the CO2-lean phase can be recycled to the absorber prior to regeneration hence the energy demands may be substantially decreased compared to nonphase change processes. The review briefly provides the basic chemical and physical principles required to understand the phase-change behavior in postcombustion CO2 capture systems. The reviewed work is further organized per different solvent type into major sections including experimental property measurement studies, experimental pilot plant studies, thermodynamic and kinetic modeling studies, as well as process modeling and technoeconomic assessment studies. In all sections we provide details regarding experimental approaches, operating conditions of pilot plants, implementations in different industries, and performance data. Key findings include operating observations and performance indicators regarding the investigated solvents and processes as well as a substantiated estimation of their technology readiness level.

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“…The results suggested that the CO 2 reaction rate could be approximated as the formation rate of MAPA carbamate, whereas DEEA as a strong proton receiver made a great contribution to the observed kinetics constant. In addition, Wang et al , established kinetics models of CO 2 absorption into DETA-DEEA and DMBA-DEEA biphasic solvents and concluded that the CO 2 absorption was mainly affected by the liquid film diffusion process. Although the above works have provided useful references for studying the kinetics of CO 2 absorption into bisolvent biphasic systems, kinetics information for the trisolvent biphasic solvent is rare.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and Thermodynamics of CO₂ Absorption into a Novel DETA-AMP-PMDETA Biphasic Solvent

Zhou

et al. 2019

ACS Sustainable Chem. Eng.

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A novel biphasic solvent consisting of diethylenetriamine (DETA), 2-amino-2-methyl-1-propanol (AMP), and pentamethyldiethylenetriamine (PMDETA) is considered as a promising CO2-capturing candidate because of its high absorption capacity, favorable phase separation behavior, fast desorption rate, and high cyclic capacity. In the present work, reaction kinetics and thermodynamics of CO2 absorption into the DETA-AMP-PMDETA biphasic solvent were studied. The kinetics process of CO2 absorption was described using the zwitterion mechanism and invoking the two-film theory. Under the fast pseudo-first-order regime, kinetics parameters, e.g., overall reaction rate constant (k ov,mix), second-order rate constant (k 2,mix), and enhancement factor (E), were determined. Kinetics results indicated that the CO2 reaction rate was mainly determined by DETA and AMP in the biphasic system, while PMDETA molecules would aggregate to form PMDETA clusters, which limited the absorption of CO2 to a certain extent. On the other hand, thermodynamics results showed that the regeneration heat of DETA-AMP-PMDETA biphasic solvents could be significantly reduced compared with that of MEA. In particular, the regeneration heat of the solvent 0.5 mol·L–1 (M) DETA + 1.5 M AMP + 3 M PMDETA (0.5D1.5A3P) was only 1.83 GJ·ton–1 CO2, which was approximately 52% lower than that of 30 wt % MEA. This finding suggested that the DETA-AMP-PMDETA biphasic solvent may be a good alternative to MEA to advance energy-efficient and economical CO2 capture.

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Mass transfer characteristics of CO 2 absorption into a phase-change solvent in a wetted-wall column

Cited by 49 publications

References 33 publications

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

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

Phase-Change Solvents and Processes for Postcombustion CO₂ Capture: A Detailed Review

Kinetics and Thermodynamics of CO₂ Absorption into a Novel DETA-AMP-PMDETA Biphasic Solvent

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Mass transfer characteristics of CO 2 absorption into a phase-change solvent in a wetted-wall column

Cited by 49 publications

References 33 publications

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

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

Phase-Change Solvents and Processes for Postcombustion CO2 Capture: A Detailed Review

Kinetics and Thermodynamics of CO2 Absorption into a Novel DETA-AMP-PMDETA Biphasic Solvent

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Product

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

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

Phase-Change Solvents and Processes for Postcombustion CO₂ Capture: A Detailed Review

Kinetics and Thermodynamics of CO₂ Absorption into a Novel DETA-AMP-PMDETA Biphasic Solvent