Experimental study and modified modeling on effect of SO2 on CO2 absorption using amine solution

Liu, Chang; Zhao, Zhongyang; Shao, Lingyu; Zhu, Linchao; Feng, Xiao; Jiang, Xuanze; Zheng, Chenghang; Gao, Xiang

doi:10.1016/j.cej.2022.137751

Cited by 21 publications

(8 citation statements)

References 43 publications

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“…In addition, SO 2 is considered an impurity to impede the performance and chemical stability of CO 2 absorbents, which will lead to a decrease in CO 2 capture efficiency. 46,47 As shown in Figure 3b, the CO 2 capture efficiency was reduced to 28.5% with the increase in SO 2 concentration. A prior study showed that SO 3 could cause higher levels of amine emissions in CO 2 capture systems.…”

Section: ■ Materials and Methodsmentioning

confidence: 86%

“…The aerosol mass concentration was 681.01 mg/m 3 with 50 ppm SO 2 and 6 vol % CO 2 , which was 2.82 times that of 6 vol % CO 2 only (as shown in Figure b). In addition, SO 2 is considered an impurity to impede the performance and chemical stability of CO 2 absorbents, which will lead to a decrease in CO 2 capture efficiency. , As shown in Figure b, the CO 2 capture efficiency was reduced to 28.5% with the increase in SO 2 concentration.…”

Section: Resultsmentioning

confidence: 99%

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Preventing Aerosol Emissions in a CO₂ Capture System: Combining Aerosol Formation Inhibition and Wet Electrostatic Precipitation

Shao

Liu

Wang

et al. 2022

Environ. Sci. Technol.

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Aerosol emission from the CO 2 capture system has raised great concern for causing solvent loss and serious environmental issues. Here, we propose a comprehensive method for reducing aerosol emissions in a CO 2 capture system under the synergy of aerosol formation inhibition and wet electrostatic precipitation. The gas−solvent temperature difference plays a vital role in aerosol formation, with aerosol emissions of 740.80 mg/m 3 at 50 K and 119.36 mg/m 3 at 0 K. Different effects of SO 2 and SO 3 on aerosol formation are also found in this research; the aerosol mass concentration could reach 2341.25 mg/m 3 at 20 ppm SO 3 and 681.01 mg/m 3 at 50 ppm SO 2 with different aerosol size distributions. After the CO 2 capture process, an aerosol removal efficiency of 98% can be realized by electrostatic precipitation under different CO 2 concentrations. Due to the high concentration of aerosols and aerosol space charge generated by SO 2 and SO 3 , the removal performance of the wet electrostatic precipitator decreases, resulting in a high aerosol emission concentration (up to 130.26 mg/m 3 ). Thus, a heat exchanger is installed before the electrostatic precipitation section to enhance aerosol growth and increase aerosol removal efficiency. Under the synergy of aerosol formation inhibition and electrostatic precipitation, an aerosol removal efficiency of 99% and emission concentrations lower than 5 mg/m 3 are achieved, contributing to global warming mitigation and environmental protection.

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Section: ■ Materials and Methodsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Preventing Aerosol Emissions in a CO₂ Capture System: Combining Aerosol Formation Inhibition and Wet Electrostatic Precipitation

Shao

Liu

Wang

et al. 2022

Environ. Sci. Technol.

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“…and had a stronger affinity for MDEA. The molecular simulation research 39 showed that the length of the N−C bond in the MDEA-CO 2 system (4.128 Å) was smaller than that of the N−S bond in the MDEA-SO 2 (2.216 Å), which indicated the stronger interaction of N−S. Meanwhile, the length of the N−S bond in the MDEA-SO 2 −CO 2 system was decreased to 2.188 Å, and that of the N−C bond was significantly extended to 5.017 Å.…”

Section: So 2 and Co 2 Absorption Performance In Stage Imentioning

confidence: 99%

A Membrane Cascade Absorption Process for Synergistic Removal of SO₂ and CO₂ from Flue Gas

Feng,

Liu,

et al. 2024

Energy Fuels

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A cascaded hollow fiber membrane contactor (HFMC) process for the simultaneous removal and separation of SO 2 and CO 2 from flue gas was proposed in this study. SO 2 and CO 2 were separated in stage I, where SO 2 and CO 2 showed a strong interaction affect. SO 2 had an obvious inhibition on CO 2 , while CO 2 showed little of a promotion effect on SO 2 . The removal rate of SO 2 was as high as 100%, which of CO 2 was 15.6%. The total CO 2 removal rate could reach 92.55% with 2 mol/L MDEA-MEA aqueous solution with a ratio of 1:0.75 after being absorbed in stage II. Chemical precipitation and thermal desorption were applied in the regeneration of effluent, respectively, by which 66.2% MDEA and 80.5% MDEA-MEA were regenerated. Meanwhile, mixed inorganic calcium salt and pure CO 2 could be obtained as byproducts. After 90 days' being soaked in 0.5 mol/L MDEA solution and 2.5 mol/L MDEA-MEA solution, the contact angle of the hollow fiber membrane was still greater than 90°, the structure of functional group was not obviously changed, and the surface morphology was changed slightly. All of these results indicated that this membrane cascade process integrated with chemical precipitation and thermal desorption regeneration could efficiently remove the acidic gas from flue gas, realize the recycling of absorbent, and utilize the SO 2 and CO 2 as chemical resources. It also provided a new pathway for efficient control and resource utilization of air pollution.

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“…Current efforts mainly focused on avoiding adverse effects of impurity or intermediate components on catalysts, by weakening undesirable species absorption, engineering protective or sacrificial layers, promoting catalytic reaction selectivity, etc. − However, these strategies of passivity defense were still insufficient to deal with complicated reactions in industrial production. From the opposite perspective, it could be treated as positive strategy by converting some unexpected species into active sites through in situ surface reconstruction, participated and accelerated original catalytic reaction. , Chemical carbon dioxide (CO 2 ) capture technologies, which demonstrate encouraging progress and feasibility in mitigating human-induced CO 2 emissions, rely on the rapid reversible zwitterion-mediated reaction combined with amine solvent and CO 2 . , Unfortunately, the intricate hydrogen-bonding network in alkaline amine solvents severely hampers the CO 2 desorption kinetics. , Additionally, sulfur dioxide (SO 2 ), a strong acid coexists with CO 2 , tends to preferentially bind with amines to form S–N bonds, inevitably resulting in SO 2 poisoning of amine solvent in practice . Therefore, development of a high-performance catalyst for enhancing the CO 2 desorption kinetics and sulfur resistance was urgently required in the pursuit of cost-effective chemical CO 2 capture.…”

Section: Introductionmentioning

confidence: 99%

“…9,10 Additionally, sulfur dioxide (SO 2 ), a strong acid coexists with CO 2 , tends to preferentially bind with amines to form S−N bonds, inevitably resulting in SO 2 poisoning of amine solvent in practice. 11 Therefore, development of a highperformance catalyst for enhancing the CO 2 desorption kinetics and sulfur resistance was urgently required in the pursuit of cost-effective chemical CO 2 capture.…”

Section: Introductionmentioning

confidence: 99%

Sulfur Migration Enhanced Proton-Coupled Electron Transfer for Efficient CO₂ Desorption with Core-Shelled C@Mn₃O₄

Xing,

Chen,

Zhan

et al. 2024

Environ. Sci. Technol.

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Transforming hazardous species into active sites by ingenious material design was a promising and positive strategy to improve catalytic reactions in industrial applications. To synergistically address the issue of sluggish CO2 desorption kinetics and SO2-poisoning solvent of amine scrubbing, we propose a novel method for preparing a high-performance core–shell C@Mn3O4 catalyst for heterogeneous sulfur migration and in situ reconstruction to active –SO3H groups, and thus inducing an enhanced proton-coupled electron transfer (PCET) effect for CO2 desorption. As anticipated, the rate of CO2 desorption increases significantly, by 255%, when SO2 is introduced. On a bench scale, dynamic CO2 capture experiments reveal that the catalytic regeneration heat duty of SO2-poisoned solvent experiences a 32% reduction compared to the blank case, while the durability of the catalyst is confirmed. Thus, the enhanced PCET of C@Mn3O4, facilitated by sulfur migration and simultaneous transformation, effectively improves the SO2 resistance and regeneration efficiency of amine solvents, providing a novel route for pursuing cost-effective CO2 capture with an amine solvent.

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Experimental study and modified modeling on effect of SO2 on CO2 absorption using amine solution

Cited by 21 publications

References 43 publications

Preventing Aerosol Emissions in a CO₂ Capture System: Combining Aerosol Formation Inhibition and Wet Electrostatic Precipitation

Preventing Aerosol Emissions in a CO₂ Capture System: Combining Aerosol Formation Inhibition and Wet Electrostatic Precipitation

A Membrane Cascade Absorption Process for Synergistic Removal of SO₂ and CO₂ from Flue Gas

Sulfur Migration Enhanced Proton-Coupled Electron Transfer for Efficient CO₂ Desorption with Core-Shelled C@Mn₃O₄

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Experimental study and modified modeling on effect of SO2 on CO2 absorption using amine solution

Cited by 21 publications

References 43 publications

Preventing Aerosol Emissions in a CO2 Capture System: Combining Aerosol Formation Inhibition and Wet Electrostatic Precipitation

Preventing Aerosol Emissions in a CO2 Capture System: Combining Aerosol Formation Inhibition and Wet Electrostatic Precipitation

A Membrane Cascade Absorption Process for Synergistic Removal of SO2 and CO2 from Flue Gas

Sulfur Migration Enhanced Proton-Coupled Electron Transfer for Efficient CO2 Desorption with Core-Shelled C@Mn3O4

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Product

Resources

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Preventing Aerosol Emissions in a CO₂ Capture System: Combining Aerosol Formation Inhibition and Wet Electrostatic Precipitation

Preventing Aerosol Emissions in a CO₂ Capture System: Combining Aerosol Formation Inhibition and Wet Electrostatic Precipitation

A Membrane Cascade Absorption Process for Synergistic Removal of SO₂ and CO₂ from Flue Gas

Sulfur Migration Enhanced Proton-Coupled Electron Transfer for Efficient CO₂ Desorption with Core-Shelled C@Mn₃O₄