Copper electrowinning-coupled CO2 capture in solvent based post-combustion capture

Wang, Changhong; Jiang, Ke; Yu, Hai; Yang, Shenghai; Li, Kangkang

doi:10.1016/j.apenergy.2022.119086

Cited by 24 publications

(3 citation statements)

References 44 publications

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“…Investigations on the replenishment mechanism of the electrolyte and additives as well as economic estimations of the cost input and output return for crude Pb electrorefining in the Lugalvan BNO12-assisted MSA system are now being performed. The energetic performance and process design of electrorefining would be further improved by low-investment microkinetic modeling. − Preparation of novel electrodes with nano- and polymeric materials will further improve the electrochemical performance of the deposition process. − The continuous drop in price of renewable electricity would further advance electrorefining toward lower-cost operation. Overall, crude Pb electrorefining in the Lugalvan BNO12-assisted MSA system would operate in a more technically and economically beneficial mode once receiving reasonable optimizations of process and condition and hold great potential toward practical application.…”

Section: Discussionmentioning

confidence: 99%

Green Electrorefining of Crude Lead with High-Quality Deposits in an Additive-Assisted Methanesulfonic Acid System

XIANG

Zhu

Song

et al. 2022

ACS Sustainable Chem. Eng.

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The conventional electrorefining process of crude lead (Pb)�employing a bone glue (BG)-and calcium lignosulfonate (CL)synergistically assisted fluosilicic acid (H 2 SiF 6 ) system�suffers the undesired environment burden caused by the high saturated vapor pressure and low stability of H 2 SiF 6 . Herein, we propose an additiveassisted methanesulfonic acid (MSA) system for green and efficient electrorefining of crude Pb based on the low volatility and high stability of MSA. Combinations of MSA with additives are evaluated and screened using photographic images, SEM observations, XRD, white light interference, etc. The electrochemical analysis of cyclic voltammetry and chronoamperometry elucidates the Pb deposition behavior in the Lugalvan BNO12-assisted MSA system, in which a three-dimensional nucleation model is applicable. Using MSA as the solvent and β-naphthol ethoxylate (Lugalvan BNO12) as the assisted additive, the bench-scale operation of crude Pb electrorefining experimentally achieves an electric energy requirement (W) of 87 kWh e /t Pb and a cathodic current efficiency (η) of 99.6%. This is very competitive with the W of 120 kWh e /t Pb and η of 95.0% for the BG-CL-assisted H 2 SiF 6 system. Also, the bench-scale operation obtains a plat and dense deposit sample with a Pb purity of >99.99%. The distribution behavior of elements shows that most of the Pb element is recovered in the form of the cathodic Pb, elements Sn, Zn, and Fe mainly accumulate in the electrolyte, and elements As, Sb, Bi, Ag, and Cu remain in the anode slime. This work opens new directions for more technically and economically feasible Pb electrorefining.

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Section: Discussionmentioning

confidence: 99%

Green Electrorefining of Crude Lead with High-Quality Deposits in an Additive-Assisted Methanesulfonic Acid System

XIANG

Zhu

Song

et al. 2022

ACS Sustainable Chem. Eng.

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“…Wu et al , conducted systematic research on the MEA–Cu-based system, achieving an extremely competitive regeneration energy of 60.76 kJ/mol CO 2 under a current density of 200 A/m 2 . In addition, Wang and Li et al − proposed the ECCS process with NH 3 as an absorbent, conducted comprehensive investigations, and eventually achieved an experimentally optimized energy requirement of 52 kJ e /mol CO 2 in bench-scale operation. Some research has also focused on mixed amines, such as Rahimi et al, , who investigated a mixture of EDA and aminoethylethanolamine (AEEA) and concluded that the energy requirement for mixing solvent is about 10% lower than that of pure EDA.…”

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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“…This 4-stage cycle makes distinct the electrochemical reactions from the CO 2 -transfer processes to make it easier to design and study: each stage, and thus each reactor, only has one process being intentionally driven at a time. Despite low minimum energy demands for electrochemical CO 2 capture, bench-scale energy demands are still greater than established CO 2 capture design targets due to poor energy efficiencies ,,− and unoptimized sorbent chemistries …”

Section: Introductionmentioning

confidence: 99%

Kinetic Drawbacks of Combining Electrochemical CO₂ Sorbent Reactivation with CO₂ Absorption

Boualavong,

Gorski

2023

Ind. Eng. Chem. Res.

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Electrochemical CO 2 capture approaches, where electrochemical reactions control the sorbent's CO 2 affinity to drive subsequent CO 2 absorption/desorption, have gained substantial attention due to their low energy demands compared to temperature-swing approaches. Typically, the process uses separate electrochemical and mass-transfer steps, producing a 4-stage (cathodic/anodic, absorption/desorption) process, but recent work proposed that these energy demands can be further reduced by combining the electrochemical and CO 2 mass-transfer reactor units. Here, we used computational models to examine the practical benefit of combining electrochemical sorbent reactivation with CO 2 absorption due to this combination's implicit assumptions about the process rate and therefore, the reactor size and cost. Comparing the minimum energy demand and process time of this combined reactor to those of the separated configuration, we found that the combined absorber can reduce the energy demand by up to 67% but doing so can also increase the process time by several orders of magnitude. In contrast, optimizing the solution chemistry could benefit both the energy demand and process time simultaneously.

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Copper electrowinning-coupled CO2 capture in solvent based post-combustion capture

Cited by 24 publications

References 44 publications

Green Electrorefining of Crude Lead with High-Quality Deposits in an Additive-Assisted Methanesulfonic Acid System

Green Electrorefining of Crude Lead with High-Quality Deposits in an Additive-Assisted Methanesulfonic Acid System

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

Kinetic Drawbacks of Combining Electrochemical CO₂ Sorbent Reactivation with CO₂ Absorption

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Copper electrowinning-coupled CO2 capture in solvent based post-combustion capture

Cited by 24 publications

References 44 publications

Green Electrorefining of Crude Lead with High-Quality Deposits in an Additive-Assisted Methanesulfonic Acid System

Green Electrorefining of Crude Lead with High-Quality Deposits in an Additive-Assisted Methanesulfonic Acid System

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

Kinetic Drawbacks of Combining Electrochemical CO2 Sorbent Reactivation with CO2 Absorption

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

Kinetic Drawbacks of Combining Electrochemical CO₂ Sorbent Reactivation with CO₂ Absorption