Vapor–liquid equilibrium in amino acid salt system: Experiments and modeling

Aronu, Ugochukwu E.; Hessen, Erik T.; Haug–Warberg, Tore; Hoff, Karl Anders; Svendsen, Hallvard F.

doi:10.1016/j.ces.2011.02.033

Cited by 51 publications

(19 citation statements)

References 27 publications

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“…The mass balance of CO 2 in a spheral droplet can be expressed as Considering that the reaction between CO 2 and KSAR is very fast, it is believed that the equilibrium concentration of CO 2 in the droplet is zero ( C CO 2 ,e = 0) when lean CO 2 loading is low . Then, eq can be simplified as where C CO 2 ,0 , determined by P 0 y CO 2 / H e , is the concentration of CO 2 at the gas–liquid interface and k ov can be calculated by eqs –.…”

Section: Model Developmentmentioning

confidence: 99%

Low-Concentration CO₂ Capture from Natural Gas Power Plants Using a Rotating Packed Bed Reactor

et al. 2018

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A rotating packed bed (RPB) was employed as a highly effective reactor to intensify CO 2 capture in a green and natural amino acid salt absorbent, potassium sarcosine (KSAR), from the flue gas containing a low CO 2 concentration. Experimental results show that a good CO 2 capture performance, presented in terms of CO 2 capture efficiency and overall volumetric mass transfer coefficient (K G a), can be obtained at a low CO 2 concentration of 2−6%. CO 2 capture efficiency could reach higher than 80% at a relatively high gas−liquid ratio, with CO 2 loading up to 0.17 mol of CO 2 /mol of KSAR. Comparison results with a packed column show that a RPB can obtain higher CO 2 capture performance with a smaller device size. Moreover, a mathematical model was developed to describe the mass transfer process in a RPB. Calculated values of K G a agreed well with experimental data, with a deviation within ±25%, and the tendency of the CO 2 concentration at the outlet of the RPB can be well-predicted under a high liquid flow rate and high rotation speed. The model provides a view on the mass transfer process of CO 2 capture in the RPB and offers a theoretical basis for the design and application of a RPB in the future.

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Section: Model Developmentmentioning

confidence: 99%

Low-Concentration CO₂ Capture from Natural Gas Power Plants Using a Rotating Packed Bed Reactor

et al. 2018

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“…TNO has also investigated processes based on the potassium salt of amino acids, showing increased stability and resistance to degradation over conventional MEA . In recent years, interest has grown in the performance of different amino acid salts for postcombustion capture, and the CO 2 absorption characteristics for common amino acids and their properties are under extensive investigation. − During CO 2 absorption, amino acid precipitates may be formed at high CO 2 loadings because the pH of the solution decreases, favoring the formation of the zwitterion species, which has limited solubility. Since the conventional absorption–desorption scrubbing process is not designed to handle solids, the vast majority of the studies with amino acid salts deals with homogeneous solutions only, avoiding precipitation by reducing amino acid concentration below the saturation point when the solution is loaded with CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Conceptual Design of a Novel CO₂ Capture Process Based on Precipitating Amino Acid Solvents

Fernández

Heffernan

Ham

et al. 2013

Ind. Eng. Chem. Res.

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Amino acid salt based solvents can be used for CO 2 removal from flue gas in a conventional absorption−thermal desorption process. Recently, new process concepts have been developed based on the precipitation of the amino acid zwitterion species during the absorption of CO 2 . In this work, a new concept is introduced which requires the precipitation of the pure amino acid species and the partial recycle of the remaining supernatant to the absorption column. This induces a shift in the pH of the rich solution treated in the stripper column that has substantial energy benefits during CO 2 desorption. To describe and evaluate this concept, this work provides the conceptual design of a new process (DECAB Plus) based on a 4 M aqueous solution of potassium taurate. The design is supported by experimental data such as amino acid speciation, vapor−liquid equilibria of CO 2 on potassium taurate solutions, and solid−liquid partition. The same conceptual design method has been used to evaluate a baseline case based on 5 M MEA. After thorough evaluation of the significant variables, the new DECAB Plus process can lower the specific reboiler energy for solvent regeneration by 35% compared to the MEA baseline. The specific reboiler energy is reduced from 3.7 GJ/tCO 2 , which corresponds to the MEA baseline, to 2.4 GJ/tCO 2 , which corresponds to the DECAB Plus process described in this work, excluding the low-grade energy required to redissolve the precipitates formed during absorption. Although this low-grade energy will eventually reduce the overall energy savings, the evaluation of DECAB Plus has indicated the potential of this concept for postcombustion CO 2 capture.

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“…Density is one of the flow properties that should be critically evaluated as it is necessary for the detailed characterization of solvent for industrial application [43][44][45]. Increasing the density of solvent used can impact volumetric flowrate of solvent for the CO 2 absorption process, thus affecting the work input for pumps and heat exchangers [20].…”

Section: Fluid Mechanics and Flow Properties Of Nanoparticle-based So...mentioning

confidence: 99%

A Review on Enhancing Solvent Regeneration in CO2 Absorption Process Using Nanoparticles

Rozaiddin

Lau

2022

Sustainability

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The employment of nanoparticles in solvents is a promising method to reduce the energy consumption during solvent regeneration. Numerous experimental and theoretical studies have been conducted to investigate the remarkable enhancement of nanoparticles. Yet, there are limited reviews on the mechanistic role of nanoparticles in enhancing the solvent regeneration performance. This review addresses the recent development on the employment of various nanoparticles, which include metals oxides, zeolites and mesoporous silicas, to enhance the mass and heat transfer, which subsequently minimize the solvent regeneration energy. The enhancement mechanisms of the nanoparticles are elaborated based on their physical and chemical effects, with a comprehensive comparison on each nanoparticle along with its enhancement ratio. This review also provides the criteria for selecting or synthesizing nanoparticles that can provide a high regeneration enhancement ratio. Furthermore, the future research prospects for the employment of nanoparticles in solvent regeneration are also recommended.

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Vapor–liquid equilibrium in amino acid salt system: Experiments and modeling

Cited by 51 publications

References 27 publications

Low-Concentration CO₂ Capture from Natural Gas Power Plants Using a Rotating Packed Bed Reactor

Low-Concentration CO₂ Capture from Natural Gas Power Plants Using a Rotating Packed Bed Reactor

Conceptual Design of a Novel CO₂ Capture Process Based on Precipitating Amino Acid Solvents

A Review on Enhancing Solvent Regeneration in CO2 Absorption Process Using Nanoparticles

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Vapor–liquid equilibrium in amino acid salt system: Experiments and modeling

Cited by 51 publications

References 27 publications

Low-Concentration CO2 Capture from Natural Gas Power Plants Using a Rotating Packed Bed Reactor

Low-Concentration CO2 Capture from Natural Gas Power Plants Using a Rotating Packed Bed Reactor

Conceptual Design of a Novel CO2 Capture Process Based on Precipitating Amino Acid Solvents

A Review on Enhancing Solvent Regeneration in CO2 Absorption Process Using Nanoparticles

Contact Info

Product

Resources

About

Low-Concentration CO₂ Capture from Natural Gas Power Plants Using a Rotating Packed Bed Reactor

Low-Concentration CO₂ Capture from Natural Gas Power Plants Using a Rotating Packed Bed Reactor

Conceptual Design of a Novel CO₂ Capture Process Based on Precipitating Amino Acid Solvents