Thermodynamic and kinetic properties of NH3-K2CO3-CO2-H2O system for carbon capture applications

Lillia, Stefano; Bonalumi, Davide; Fosbøl, Philip Loldrup; Thomsen, Kaj; Jayaweera, Indira; Valenti, Gianluca

doi:10.1016/j.ijggc.2019.03.019

Cited by 24 publications

(16 citation statements)

References 24 publications

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“…In addition to the listed species, potassium and mixed potassium–ammonium salts may precipitate in the solution . Solid formation in aqueous MDEA solutions has been the topic of investigation in an earlier study .…”

Section: Theory and Calculationmentioning

confidence: 99%

“…In addition to the listed species, potassium and mixed potassium−ammonium salts may precipitate in the solution. 22 Solid formation in aqueous MDEA solutions has been the topic of investigation in an earlier study. 23 Additionally, several authors have indicated the precipitation of ammonium carbamate (NH 2 COONH 4 ) due to a gas-phase reaction between CO 2 and ammonia.…”

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confidence: 99%

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Vapor–Liquid Equilibrium Measurements for Aqueous Mixtures of NH₃+ MDEA + CO₂and KOH + MDEA

et al. 2022

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Isothermal vapor−liquid equilibrium measurements were performed for aqueous solutions containing N-methyl diethanolamine (MDEA), MDEA + ammonia (NH 3 ), MDEA + potassium hydroxide (KOH), MDEA + carbon dioxide (CO 2 ), NH 3 + CO 2 , and MDEA + NH 3 + CO 2 . The experiments were carried out between 310 and 390 K and 0.07 and 34 bar using a static synthetic apparatus. Overall, 202 data points are reported in terms of total volume, total number of moles, temperature, and pressure. The experimental results for MDEA(aq), NH 3 (aq) + CO 2 (aq), and MDEA(aq) + CO 2 (aq) are in good agreement with the calculations done using the Extended UNIQUAC model within the studied range. The data presented in this work are also comparable to previously published measurements. This work reports for the first time VLE measurements for aqueous mixtures of MDEA + NH 3 and MDEA + KOH. These data suggest that the interactions between MDEA(aq) and NH 3 (aq) or K + (aq) ions have a minor effect on the equilibrium pressures. Consequently, other physical properties are needed to describe the thermodynamic state of these systems, such as heat capacity, heat of dilution, and other phase equilibrium measurements. The isothermal VLE measurements for solutions containing NH 3 (aq) showed a pressure minimum that was confirmed by model estimates and by other works done in similar conditions. As a consequence, it is not possible to estimate the partial pressure of CO 2 based on the difference between the pressure at equilibrium conditions and the partial pressure of the lean solvent. This paper demonstrates that this common approach to determining the partial pressure of gases may introduce a bias in these values. The dissolution of CO 2 into MDEA(aq) + NH 3 (aq) mixtures changes the speciation of the system, leading to an increase in the concentration of their protonated species (MDEAH + (aq) and NH 4 + (aq), respectively). For this reason, the interaction between these charged species must be determined in order to perform reliable phase equilibrium calculations. Ultimately, the measurements reported in this work can be used for thermodynamic modeling of CO 2 capture solvents to ensure accurate results in process simulation.

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Section: Theory and Calculationmentioning

confidence: 99%

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confidence: 99%

Vapor–Liquid Equilibrium Measurements for Aqueous Mixtures of NH₃+ MDEA + CO₂and KOH + MDEA

et al. 2022

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“…20 Bench-scale experiments were performed to study the capture efficiency of the new solvent 21 and the temperature dependence of the rate of absorption. 22 This new process could reduce the parasitic power demand by up to 50%, compared to state-of-the-art MEA-based processes; also, it uses 50−60% less water compared to conventional NH 3based capture. 20 These improvements were supported by detailed process simulations performed in the framework of the extended UNIQUAC model.…”

Section: ■ Introductionmentioning

confidence: 99%

“…A recent technology for CO 2 absorption combines both NH 3 and K 2 CO 3 to obtain improved reaction rates and reduced emissions . Bench-scale experiments were performed to study the capture efficiency of the new solvent and the temperature dependence of the rate of absorption . This new process could reduce the parasitic power demand by up to 50%, compared to state-of-the-art MEA-based processes; also, it uses 50–60% less water compared to conventional NH 3 -based capture .…”

Section: Introductionmentioning

confidence: 99%

Solid–Liquid Equilibrium and Binodal Curves for Aqueous Solutions of NH₃, NH₄HCO₃, MDEA, and K₂CO₃

2021

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Solid−liquid equilibrium (SLE) data were obtained at 0.1 MPa for binary, ternary, and quaternary aqueous solutions containing ammonia (NH 3 ), ammonium bicarbonate (NH 4 HCO 3 ), methyl diethanolamine (MDEA), and potassium carbonate (K 2 CO 3 ) using a modified Beckmann apparatus. The reproducibility of the experimental method was verified by measuring the SLE of aqueous solutions containing NH 3 , K 2 CO 3 , or MDEA in a temperature range between 237 and 273 K. A total of 120 new data points were measured for MDEA−NH 3 and NH 4 HCO 3 −H 2 O mixtures (250 to 305 K), and 23 new data points were obtained for MDEA−K 2 CO 3 −H 2 O solutions (250 to 270 K). These measurements allow for an accurate estimation of water activity in such mixtures and provide insights on the limits of solid formation. The results indicate that the addition of MDEA increases the solubility of NH 4 HCO 3 , whereas a liquid−liquid split was observed when K 2 CO 3 was added to aqueous MDEA. This opens the possibility of using it as a phase demixing solvent for carbon capture. Despite the extensive literature regarding mixed salt−amine solutions, liquid demixing in such systems has not been reported before. For this reason, the binodal curve for the MDEA−K 2 CO 3 −H 2 O solution was measured at 293.15 K using the method of cloud point titration. These results assist the selection of operation parameters that avoid a liquid−liquid split in the process.

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“…The literature focuses on absorption [2][3][4], adsorption, cryogenic distillation [5], and separation [6]. Particularly the adsorption works on the simplest physical principles of capturing and binding an adsorbate in pores and functional sites on the surface of the material [7]. Adsorption, relative to absorption on amine-containing solutions, is not energy-intensive and other immediate advantages refer to compactness and conservation of space, and a wider range of suitable scaffoldings and powders to assemble resilient sorbents [8].…”

Section: Introductionmentioning

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A High-Throughput Imagery Protocol to Predict Functionality upon Fractality of Carbon-Capturing Biointerfaces

et al. 2022

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Surface quality is key for any adsorbent to have an effective adsorption. Because analyzing an adsorbent can be costly, we established an imagery protocol to determine adsorption robustly yet simply. To validate our hypothesis of whether stereomicroscopy, superpixel segmentation and fractal theory consist of an exceptional merger for high-throughput predictive analytics, we developed carbon-capturing biointerfaces by pelletizing hydrochars of sugarcane bagasse, pinewood sawdust, peanut pod hull, wheat straw, and peaty compost. The apochromatic stereomicroscopy captured outstanding micrographs of biointerfaces. Hence, it enabled the segmenting algorithm to distinguish between rough and smooth microstructural stresses by chromatic similarity and topological proximity. The box-counting algorithm then adequately determined the fractal dimension of microcracks, merely as a result of processing segments of the image, without any computational unfeasibility. The larger the fractal pattern, the more loss of functional gas-binding sites, namely N and S, and thus the potential sorption significantly decreases from 10.85 to 7.20 mmol CO2 g−1 at sigmoid Gompertz function. Our insights into analyzing fractal carbon-capturing biointerfaces provide forward knowledge of particular relevance to progress in the field’s prominence in bringing high-throughput methods into implementation to study adsorption towards upgrading carbon capture and storage (CCS) and carbon capture and utilization (CCU).

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Thermodynamic and kinetic properties of NH3-K2CO3-CO2-H2O system for carbon capture applications

Cited by 24 publications

References 24 publications

Vapor–Liquid Equilibrium Measurements for Aqueous Mixtures of NH₃+ MDEA + CO₂and KOH + MDEA

Vapor–Liquid Equilibrium Measurements for Aqueous Mixtures of NH₃+ MDEA + CO₂and KOH + MDEA

Solid–Liquid Equilibrium and Binodal Curves for Aqueous Solutions of NH₃, NH₄HCO₃, MDEA, and K₂CO₃

A High-Throughput Imagery Protocol to Predict Functionality upon Fractality of Carbon-Capturing Biointerfaces

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Thermodynamic and kinetic properties of NH3-K2CO3-CO2-H2O system for carbon capture applications

Cited by 24 publications

References 24 publications

Vapor–Liquid Equilibrium Measurements for Aqueous Mixtures of NH3+ MDEA + CO2and KOH + MDEA

Vapor–Liquid Equilibrium Measurements for Aqueous Mixtures of NH3+ MDEA + CO2and KOH + MDEA

Solid–Liquid Equilibrium and Binodal Curves for Aqueous Solutions of NH3, NH4HCO3, MDEA, and K2CO3

A High-Throughput Imagery Protocol to Predict Functionality upon Fractality of Carbon-Capturing Biointerfaces

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Vapor–Liquid Equilibrium Measurements for Aqueous Mixtures of NH₃+ MDEA + CO₂and KOH + MDEA

Vapor–Liquid Equilibrium Measurements for Aqueous Mixtures of NH₃+ MDEA + CO₂and KOH + MDEA

Solid–Liquid Equilibrium and Binodal Curves for Aqueous Solutions of NH₃, NH₄HCO₃, MDEA, and K₂CO₃