Integration of a calcium carbonate crystallization process and membrane contactor–based CO2 capture

Aghajanian, Soheil; Nieminen, Harri; Лаари, Арто; Koiranen, Tuomas

doi:10.1016/j.seppur.2021.119043

Cited by 16 publications

(13 citation statements)

References 76 publications

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“…As far as the connection between the activation energies (in Arrhenius equation) and the Gibbs free energy of activation (in HTST theory), both of these two types of energies reflect whether or not a transition processes could easily occur. As to the distinction between the Arrhenius activation energy and the Gibbs free energy of activation, the Arrhenius activation energy is added in the Arrhenius equation due to empirical fitting while the Gibbs free energy of activation is brought up owing to rigorous mathematical derivation concerning the changes of Gibbs free energies in a transition process via thermodynamic treatment; 65 (2) what is more, one special trait that deserve attention is that the temperature power exponent is positively correlated with the activation energy, as shown in Figure 9.…”

Section: Resultsmentioning

confidence: 99%

“…Currently, the massive emission of CO 2 from traditional industries (e.g., coal-fired power plants, steel works, and so forth) is causing severe greenhouse effects to Earth. − In order to cut down CO 2 emission and achieve lower CO 2 concentrations in air, advanced CO 2 capture, utilization, and storage (CCUS) technologies are necessary and fundamental. , Undoubtedly, adsorbents that are industrially economical and effectively capable of collecting as much CO 2 as possible are the footstone of CCUS technologies. As far as current research studies are concerned, solid adsorbents have drawn a lot of attention because they are more circularly thermostable and energy-saving than aqueous solutions of organic amines. − Among CO 2 solid adsorbents, hexagonal boron nitride (h-BN) is the research core since h-BN not only possesses excellent physical properties (e.g., smooth surface and ample adsorption sites) but also is endowed with some attractive chemical features (e.g., delocalized π bond). − Owing to the outstanding properties of h-BN (especially large surface areas and abundant adsorption sites of tertiary amines − ), there have been some studies about applying pure/doped h-BN for capturing CO 2 .…”

Section: Introductionmentioning

confidence: 99%

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Fe-Catalyzed CO₂Adsorption over Hexagonal Boron Nitride with the Presence of H₂O

Wang

2022

ACS Appl. Mater. Interfaces

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The energy barrier of CO 2 chemically adsorbed on hexagonal boron nitride (h-BN) is relatively big. In order to cut down the energy barriers and facilitate fast adsorption of CO 2 , it is necessary to apply catalysts as a promoter. In this study, single-atom iron is introduced as the catalyst to reduce the energy barriers of CO 2 adsorbed on pure/doped h-BN. Through density functional theory calculations, catalytic reaction mechanisms, stability of single-atom iron fixed on adsorbents, CO 2 adsorption characteristics, and features of thermodynamics/reaction dynamics during adsorption processes are fully investigated to explain the catalytic effects of single-atom iron on CO 2 chemisorption. According to calculations, when CO 2 and OH − get into activated states (i.e., CO 2•− and • OH) with the help of single-atom iron, their chemical activities will be promoted to a large degree, which makes the transition state (TS) energy barrier of HCO 3 − to decrease by 92.54%. In the meantime, it is proved that single-atom iron could be stably fixed on doped h-BN with the binding energy larger than 2 eV to achieve sustainable catalysis. With the presence of single-atom iron, TS energy barriers of CO 2 adsorbed on h-BN with the presence of H 2 O decreased by 94.39, 78.87, and 30.63% over pure h-BN, 3C-doped h-BN, and 3N-doped h-BN, respectively. In the meantime, thermodynamic analyses indicate that TS energy barriers are mainly determined by element doping and temperatures are a little beneficial to the reduction of TS energy barriers. With the above aspects combined, the results of this study could supply crucial information for massively and quickly capturing CO 2 in real industries.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fe-Catalyzed CO₂Adsorption over Hexagonal Boron Nitride with the Presence of H₂O

Wang

2022

ACS Appl. Mater. Interfaces

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“…For all the investigated cases, CaCl 2 (purity > 98%, Merck, Darmstadt, Germany) concentration was 1.6 g L −1 , mixing speed was 100 RPM (tip speed of 0.37 m s −1 ) and the feed addition rate was 40 mL min −1 . The aqueous CO 2− 3 was prepared by injecting CO 2 gas (purity > 99.9%) into sodium hydroxide (NaOH, Purity > 98%, Merck) solution-a detailed experimental procedure is provided in [39]. Experiments were performed at a temperature of (20 ± 2) • C. The reactive crystallization experiments and the associated ERT-based measurements were repeated at least three times to ensure the reliability of the results.…”

Section: Process Description Of Caco 3 Reactive Crystallizationmentioning

confidence: 99%

Monitoring and Visualization of Crystallization Processes Using Electrical Resistance Tomography: CaCO3 and Sucrose Crystallization Case Studies

Rao

Aghajanian

Zhang

et al. 2022

Sensors

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In the current research work, electrical resistance tomography (ERT) was employed for monitoring and visualization of crystallization processes. A first-of-its-kind MATLAB-based interactive GUI application “ERT-Vis” is presented. Two case studies involving varied crystallization methods were undertaken. The experiments were designed and performed involving calcium carbonate reactive (precipitative) crystallization for the high conductivity solution-solute media, and the cooling crystallization of sucrose representing the lower conductivity solution–solute combination. The software successfully provided key insights regarding the process in both crystallization systems. It could detect and separate the solid concentration distributions in the low as well as high conductivity solutions using the visual analytics tools provided. The performance and utility of the software were studied using a software evaluation case study involving domain experts. Participant feedback indicated that ERT-Vis software helps by reconstructing images instantaneously, interactively visualizing, and evaluating the output of the crystallization process monitoring data.

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“…The governing chemical reaction is presented in Equation (11) where aqueous CO 2− 3 (aq) flows through an inlet pipe (diameter: 2 mm) into the crystallizer containing a known concentration of calcium chloride (CaCl 2 , purity > 98%, Merck). A detaileds description of the CO 2 capture process and its integration with the calcium carbonate crystallization is given in [48].…”

Section: Caco 3 Crystallization Setup and Process Descriptionmentioning

confidence: 99%

An Ultrasound Tomography Method for Monitoring CO2 Capture Process Involving Stirring and CaCO3 Precipitation

Koulountzios

Aghajanian²,

Rymarczyk³

et al. 2021

Sensors

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In this work, an ultrasound computed tomography (USCT) system was employed to investigate the fast-kinetic reactive crystallization process of calcium carbonate. USCT measurements and reconstruction provided key insights into the bulk particle distribution inside the stirred tank reactor and could be used to estimate the settling rate and settling time of the particles. To establish the utility of the USCT system for dynamical crystallization processes, first, the experimental imaging tasks were carried out with the stirred solid beads, as well as the feeding and stirring of the CaCO3 crystals. The feeding region, the mixing process, and the particles settling time could be detected from USCT data. Reactive crystallization experiments for CO2 capture were then conducted. Moreover, there was further potential for quantitative characterization of the suspension density in this process. USCT-based reconstructions were investigated for several experimental scenarios and operating conditions. This study demonstrates a real-time monitoring and fault detection application of USCT for reactive crystallization processes. As a robust noninvasive and nonintrusive tool, real-time signal analysis and reconstruction can be beneficial in the development of monitoring and control systems with real-world applications for crystallization processes. A diverse range of experimental studies shown here demonstrate the versatility of the USCT system in process application, hoping to unlock the commercial and industrial utility of the USCT devices.

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Integration of a calcium carbonate crystallization process and membrane contactor–based CO2 capture

Cited by 16 publications

References 76 publications

Fe-Catalyzed CO₂Adsorption over Hexagonal Boron Nitride with the Presence of H₂O

Fe-Catalyzed CO₂Adsorption over Hexagonal Boron Nitride with the Presence of H₂O

Monitoring and Visualization of Crystallization Processes Using Electrical Resistance Tomography: CaCO3 and Sucrose Crystallization Case Studies

An Ultrasound Tomography Method for Monitoring CO2 Capture Process Involving Stirring and CaCO3 Precipitation

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Integration of a calcium carbonate crystallization process and membrane contactor–based CO2 capture

Cited by 16 publications

References 76 publications

Fe-Catalyzed CO2Adsorption over Hexagonal Boron Nitride with the Presence of H2O

Fe-Catalyzed CO2Adsorption over Hexagonal Boron Nitride with the Presence of H2O

Monitoring and Visualization of Crystallization Processes Using Electrical Resistance Tomography: CaCO3 and Sucrose Crystallization Case Studies

An Ultrasound Tomography Method for Monitoring CO2 Capture Process Involving Stirring and CaCO3 Precipitation

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Fe-Catalyzed CO₂Adsorption over Hexagonal Boron Nitride with the Presence of H₂O

Fe-Catalyzed CO₂Adsorption over Hexagonal Boron Nitride with the Presence of H₂O