Modeling study of the heat of absorption and solid precipitation for CO<sub>2</sub>capture by chilled ammonia

Zhou, Qiang; Liu, Lan; Croiset, Eric; Tan, Zhongchao; Liu, Qingcai; Yang, Jinlong

doi:10.1039/c9ra00164f

Cited by 3 publications

(4 citation statements)

References 56 publications

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“…In practical engineering, the CO 2 loading in the absorbent is considered to be a vital parameter. Studying the CO 2 loading is of great significance in guiding the regeneration degree of the resolver tower . In the experiment to study the effect of CO 2 loading on aerosol, the absorbent loading was adjusted to 0, 0.25, 0.5, 0.75, and 1 mol/L in advance using the weighing method.…”

Section: Resultsmentioning

confidence: 99%

“…Studying the CO 2 loading is of great significance in guiding the regeneration degree of the resolver tower. 50 In the experiment to study the effect of CO 2 loading on aerosol, the absorbent loading was adjusted to 0, 0.25, 0.5, 0.75, and 1 mol/L in advance using the weighing method. The remaining parameters are shown in Table 1, Section V. As shown in Figure 10, the aerosol mass concentration increased from 88.9 to 110.9 mg/ Nm 3 with the absorbent CO 2 loading rising.…”

Section: Co 2 Loadingmentioning

confidence: 99%

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Formation Mechanisms and Emission Characteristics of Aerosol in CO₂ Capture by Chemical Absorption Based on Ethanolamine Solution

Yu,

Wu,

et al. 2024

Energy Fuels

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Aerosols from the chemical absorption systems, which use organic amine solutions as absorbents to capture CO 2 in the flue gas, may pollute the atmosphere and damage the ecosystem. Based on the chemical absorption platform, this study focuses on investigating the formation mechanism and emission characteristics of aerosols in chemical absorption systems. The aerosols generated under standard operating conditions were analyzed using scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). Additionally, controlled experiments were conducted to demonstrate the impact of heterogeneous reactions on aerosol generation. In addition, the effects of practical operating parameters on aerosol emissions were explored and evaluated. The results showed that the emission of aerosols in the flue gas increased significantly after the chemical absorption platform. Most of the aerosols generated in the chemical absorption platform are submicron particles of below 1 μm, with a few micron-sized particles. Aerosol generation is significantly influenced by the presence of CO 2 , which is mainly attributed to heterogeneous reactions. Increasing the liquid-to-gas ratio and the absorbent concentration enhances the heterogeneous reaction, which leads to an increase in aerosol emissions. Lower flue gas temperatures and CO 2 loading inhibit the occurrence of heterogeneous reactions, thus reducing aerosol emissions. According to the results of the maximum emission reduction rate, it was found that the absorbent concentration had the greatest degree of influence on aerosol emissions, the maximum emission reduction rate could reach close to 50%, and the CO 2 loading had the most minor influence on aerosol emissions, which was only 13%.

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Section: Resultsmentioning

confidence: 99%

Section: Co 2 Loadingmentioning

confidence: 99%

Formation Mechanisms and Emission Characteristics of Aerosol in CO₂ Capture by Chemical Absorption Based on Ethanolamine Solution

Yu,

Wu,

et al. 2024

Energy Fuels

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“…The H CO2 values obtained at different temperatures in Table can be used for the calculation of enthalpy of absorption using the Van’t Hoff equation: and the fitting parameters are shown in Table . The enthalpy of absorption was calculated as −9.72 kJ·mol –1 , which, apart from the x –P plot, is another evidence of the physical (i.e., nonreactive) nature of [(ME,F)-mim][Tf 2 N] in CO 2 absorption as it falls within the typical range of −8.0 to −15.0 kJ·mol –1 as other physical absorbents including ILs and small neutral molecules. − The R 2 value being 0.9989 and maximum deviation <0.68% indicate good reliability for predictions of H CO2 values in a reasonably broader temperature range when these parameters are incorporated into eq .…”

Section: Resultsmentioning

confidence: 99%

Properties of Imidazolium Ionic Liquids with Glycerol-Derived Functional Groups

et al. 2022

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The selection of functional groups at the N(1) and N(3) sites of the imidazolium cation provides versatile opportunities for the design and synthesis of novel ionic liquids (ILs). Here, we show how glycerol-derived ethers provide new possibilities for the introduction of highly tailored, branched functional groups and how the selection of symmetric or asymmetric branches influences the properties of the resultant 1-R-3-methylimidazolium bistriflimide ILs. The densities and viscosities of these ILs were measured in the temperature range of 293.15−353.15 K and compared with those of the analogous 1-n-alkyl-3-methylimidazolium ILs. The temperature dependence of corresponding properties was elucidated using either linear or exponential models. Furthermore, CO 2 absorption isotherms were obtained for one of the ILs, 1-(1-(2-methoxyethoxy)-3-(2,2,2-trifluoroethoxy)propan-2-yl)-3-methyl-imidazolium bistriflimide ([(ME, F)-mim]-[Tf 2 N]). This IL had a higher CO 2 capacity than most physical solvents considered including its associated precursor, other imidazolium ILs, and DMPEG.

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“…CO 2 capture and storage (CCS) are efficient ways to alleviate the greenhouse effect and ensure sustainable global development. − Currently, the most widely used systems for CO 2 capture are based on aqueous solutions of amines. Despite their high absorption capacity, they still suffer from several key drawbacks, including high regeneration energy cost, corrosion of the reactor, and solvent loss .…”

Section: Introductionmentioning

confidence: 99%

Intensification of Amino Acid Ionic Liquids with Different Additives for CO₂ Capture

Chen

Zhang

et al. 2022

ACS Sustainable Chem. Eng.

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Amino acid ionic liquids (AAILs) exhibit prominent merits for CO2 capture including biocompatibility and good stability, but they still suffer from several demerits, such as high viscosity and low molecular utilization. Therefore, it is critical to construct proper systems that can address these problems to enhance CO2 absorption of AAILs. In this work, three types of AAIL absorbent systems, DMEE (2-[2-(dimethylamino) ethoxy] ethanol)–AAIL, H2O–AAIL, and EG (ethylene glycol)–AAIL, are prepared with six AAILs that have different amino acids. The absorption performance of these absorbents is characterized to investigate the reinforcing effects of the additives on the absorption properties of AAILs. With temperatures ranging from 293 to 313 K, the CO2 capture studies on the binary systems reveal that AAILs present better absorption efficiency when their concentrations are 40 or 50 wt %. Based on the zwitterion reaction mechanism model and a thermodynamic model, the interactions of AAILs with H2O, DMEE, and EG systems for absorbing CO2 are discussed, respectively. The results obtained in this work indicate that AAIL–DMEE systems are promising candidates for CO2 capture since the interaction between AAILs and DMEE increases the capacity of AAILs and promotes kinetics.

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Modeling study of the heat of absorption and solid precipitation for CO₂capture by chilled ammonia

Abstract: Prediction of (a) solution speciation change and (b) heat of CO2 absorption in the chilled ammonia process (CAP).

Cited by 3 publications

References 56 publications

Formation Mechanisms and Emission Characteristics of Aerosol in CO₂ Capture by Chemical Absorption Based on Ethanolamine Solution

Formation Mechanisms and Emission Characteristics of Aerosol in CO₂ Capture by Chemical Absorption Based on Ethanolamine Solution

Properties of Imidazolium Ionic Liquids with Glycerol-Derived Functional Groups

Intensification of Amino Acid Ionic Liquids with Different Additives for CO₂ Capture

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Modeling study of the heat of absorption and solid precipitation for CO2capture by chilled ammonia

Abstract: Prediction of (a) solution speciation change and (b) heat of CO2 absorption in the chilled ammonia process (CAP).

Cited by 3 publications

References 56 publications

Formation Mechanisms and Emission Characteristics of Aerosol in CO2 Capture by Chemical Absorption Based on Ethanolamine Solution

Formation Mechanisms and Emission Characteristics of Aerosol in CO2 Capture by Chemical Absorption Based on Ethanolamine Solution

Properties of Imidazolium Ionic Liquids with Glycerol-Derived Functional Groups

Intensification of Amino Acid Ionic Liquids with Different Additives for CO2 Capture

Contact Info

Product

Resources

About

Modeling study of the heat of absorption and solid precipitation for CO₂capture by chilled ammonia

Formation Mechanisms and Emission Characteristics of Aerosol in CO₂ Capture by Chemical Absorption Based on Ethanolamine Solution

Formation Mechanisms and Emission Characteristics of Aerosol in CO₂ Capture by Chemical Absorption Based on Ethanolamine Solution

Intensification of Amino Acid Ionic Liquids with Different Additives for CO₂ Capture