Mass transfer mechanism and model of CO2 absorption into a promising DEEA-HMDA solvent in a packed column

Qing, Hong; Shang, Chunliang; Bai, Liju; Fan, Zihan; Yang, Dong; Dong, Shoulong; Moioli, Stefania; Li, Miyi; Tontiwachwuthikul, Paitoon; Liu, Helei

doi:10.1016/j.seppur.2023.124095

Cited by 21 publications

(2 citation statements)

References 42 publications

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“…However, the substantial energy demand in the solvent thermal regeneration process increases the operating cost dramatically, which severely restricts its widespread industrial application. Numerous studies have been conducted to address this issue by exploring avenues such as the development of new absorbents, reactor optimization, addition of catalysts, and process intensification. − Despite these efforts, several challenges still hinder the commercialization of this technology. Primary among them is the thermal degradation of amines and the elevated energy consumption associated with amine thermal regeneration .…”

Section: Introductionmentioning

confidence: 99%

Comparative Performance Evaluation of Absorbents for the Electrowinning-Coupled Competitive Separation CO₂ Capture Process

Wu,

Fan,

Mao

et al. 2024

ACS Sustainable Chem. Eng.

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Electrowinning-coupled competitive separation (ECCS) CO 2 capture technology, utilizing renewable electricity as the energy input, is regarded as a promising electrochemically mediated CO 2 capture approach to substitute for the traditional solvent-based CO 2 scrubbing method. However, this technology is still distant from practical application due to its energy-intensive property, sensitivity to oxygen, amine degradation, and system complexity. The selection of a suitable solvent plays a crucial role in enhancing the overall performance and scalability of the ECCS system. To address an efficient solvent screening method, this paper proposed a systematic comparison of solvents in terms of thermodynamics, electrochemistry, absorption, and desorption performance. The proposed solvent screening method undergoes a critical evaluation through the development of a thermodynamic model and experimentation. Using MEA, EDA, and NH 3 as examples (solvents extensively discussed in the ECCS system), the paper provides a comprehensive discussion of the solvent screening method. Results indicate that EDA exhibits superior CO 2 absorption and thermodynamic performance. NH 3 solvent demonstrates better CO 2 desorption and electrochemical performance. However, there is an antithetical relationship between the thermodynamic and electrochemical performance. This phenomenon arises because the Cu 2+ −solvent complex, characterized by a stronger coupling performance, is more stable, necessitating a higher potential to reduce the Cu 2+ −solvent complex. This leads to increased energy consumption during the solvent regeneration process. Therefore, when solvent screening is conducted, it is essential to categorize and thoroughly consider thermodynamics, electrochemistry, and absorption and desorption performance.

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Section: Introductionmentioning

confidence: 99%

Comparative Performance Evaluation of Absorbents for the Electrowinning-Coupled Competitive Separation CO₂ Capture Process

Wu,

Fan,

Mao

et al. 2024

ACS Sustainable Chem. Eng.

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“…Amine absorption and cryogenic distillation are two conventional ways that are widely applied to capture high CO 2 concentration gases. It is well known that amine absorption is one of the most mature methods to achieve large-scale applications at present. , Generally, amine solvents need to be regenerated under low or atmospheric pressure for thorough desorption, thus only obtaining the high-purity CO 2 gas product of atmospheric pressure. However, the captured CO 2 gas usually needs to be compressed to 5–20 MPa for pipeline transportation and injection .…”

Section: Introductionmentioning

confidence: 99%

Energetic–Environmental–Economic Assessment of Integrated Different Carbon Capture and Compression Processes for High CO₂ Concentration Gas

Shi,

Zeng,

Chang

et al. 2023

ACS Sustainable Chem. Eng.

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In this work, a novel energetic–environmental–economic assessment methodology for different processes integrating carbon capture and compression was proposed. It was found that for acquiring high-pressure liquid CO2 products, the pressurized desorption (PD) process is better than conventional atmospheric desorption. Based on this, quantitative and comprehensive evaluation and comparison between PD and cryogenic distillation (CD) processes of CO2 concentrations ranging from 50 to 90% were analyzed. The results indicated that the PD process is more energy-intensive than the CD process due to the high regeneration heat. Meanwhile, the green degree analysis results showed that the CD process exhibits an environmental superiority over the PD process when the CO2 concentration exceeds 50%. According to the cost analysis, the CD process presents an almost exponential drop in the total capture cost (TCC) as the CO2 content increases, but the PD process is insensitive. Moreover, we developed a TCC model, taking the feed gas composition and flow rates as variables. It can be seen that as the flow rates of the feed gas are less than 1800 kmol/h, the PD process is more cost-effective than the CD process over a wide range below 73.02% CO2 composition, providing a quantitative method to guide the optimal process selection and design.

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Hybrid behaviors of CO₂ absorption into blended DEEA‐based solution for the improvement of capture performance

Wu,

Yin,

Fan

et al. 2024

J of Chemical Tech & Biotech

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BackgroundAt present, the chemical absorption method of CO2 capture is considered to be an effective means to reduce carbon emissions. The development of blended amine systems with excellent CO2 capture performance is the focus of research.ResultThe hybrid behaviors of N,N‐diethylethanolamine (DEEA) with addition of monoethanolamine (MEA), 2‐(methylamino)ethanol(MAE) and 2‐((2‐aminoethyl)amino)‐ethanol(AEEA) as absorbents were investigated and developed to reduce the energy consumption for solvent regeneration in CO2 capture process. The equilibrium solubility of CO2 for blended DEEA/MEA, DEEA/MAE and DEEA/AEEA with a series of molar ratios (0.0:2.0, 0.5:1.5, 1.0:1.0, 1.5:0.5 and 2.0:0.0) was examined. The experimental results showed that the values of CO2 equilibrium solubility of amine blends exhibited the compromise behavior between each individual amine solution. Additionally, the effects of molar ratios on the relative CO2 absorption rate, regeneration rate and CO2 cyclic capacity for the tested amine blends were studied using an improved rapid absorbent screening method.ConclusionThe experimental data showed that the blended DEEA/MAE solution exhibits much higher CO2 cyclic capacity than those of DEEA/AEEA under the nitrogen atomic conservation. However, the mixing DEEA and AEEA could obviously reduce the CO2 equilibrium solubility and CO2 cyclic capacity compared with that of individual AEEA solution, indicating the DEEA had an inhibiting effect on AEEA. Furthermore, the mass transfer performances of DEEA, DEEA/MAE and DEEA/AEEA were tested in order to validate the accuracy of the improved rapid absorbent screening method.This article is protected by copyright. All rights reserved.

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Mass transfer mechanism and model of CO2 absorption into a promising DEEA-HMDA solvent in a packed column

Cited by 21 publications

References 42 publications

Comparative Performance Evaluation of Absorbents for the Electrowinning-Coupled Competitive Separation CO₂ Capture Process

Comparative Performance Evaluation of Absorbents for the Electrowinning-Coupled Competitive Separation CO₂ Capture Process

Energetic–Environmental–Economic Assessment of Integrated Different Carbon Capture and Compression Processes for High CO₂ Concentration Gas

Hybrid behaviors of CO₂ absorption into blended DEEA‐based solution for the improvement of capture performance

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Mass transfer mechanism and model of CO2 absorption into a promising DEEA-HMDA solvent in a packed column

Cited by 21 publications

References 42 publications

Comparative Performance Evaluation of Absorbents for the Electrowinning-Coupled Competitive Separation CO2 Capture Process

Comparative Performance Evaluation of Absorbents for the Electrowinning-Coupled Competitive Separation CO2 Capture Process

Energetic–Environmental–Economic Assessment of Integrated Different Carbon Capture and Compression Processes for High CO2 Concentration Gas

Hybrid behaviors of CO2 absorption into blended DEEA‐based solution for the improvement of capture performance

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Comparative Performance Evaluation of Absorbents for the Electrowinning-Coupled Competitive Separation CO₂ Capture Process

Comparative Performance Evaluation of Absorbents for the Electrowinning-Coupled Competitive Separation CO₂ Capture Process

Energetic–Environmental–Economic Assessment of Integrated Different Carbon Capture and Compression Processes for High CO₂ Concentration Gas

Hybrid behaviors of CO₂ absorption into blended DEEA‐based solution for the improvement of capture performance