Integrated high-gravity process for HCl removal and CO2 capture using carbide slag slurry in a rotor-stator reactor: Experimental and modeling studies

Xiao, Hao; Song, Yunhua; Chen, Jianming; Ma, Hao; Wang, Li; Xiang, Yang; Shao, Lei

doi:10.1016/j.chemosphere.2023.139848

Cited by 4 publications

(1 citation statement)

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“…Bal et al studied the influence of NaOH concentration on HCl absorption in a self-priming venturi scrubber. However, the considerable amounts of CO 2 present in the HCl-containing gas and the reaction between CO 2 and alkali solution lead to substantial alkali consumption. ,− For instance, in the absorption process by alkali solution during recycling operation in conventional columns, a decrease in pH leads to a significant decrease in the absorption efficiency of HCl. , Therefore, to meet emission standards, the alkali solution needs to be replaced with a fresh alkali solution when the pH reaches a certain threshold. This means that a large amount of alkali solution is actually consumed by CO 2 , which increases the number of cycles and costs of the alkali solution.…”

Section: Introductionmentioning

confidence: 99%

Selective Absorption of HCl from a Gas Mixture with CO₂ by Alkali Solution in a Rotor–Stator Reactor

Xiao,

Wu,

Song

et al. 2024

Ind. Eng. Chem. Res.

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This study proposes the utilization of a rotor–stator reactor (RSR) to address the issue of excessive alkali consumption by CO2 in the treatment of off-gas containing HCl and CO2 in conventional columns. First, an investigation was conducted to explore the interaction between HCl absorption and CO2 absorption by alkali solution in the RSR. The results revealed that no discernible interaction between HCl and CO2 absorption occurred in the RSR under the typical concentrations of HCl and CO2 in off-gas. Subsequently, the absorption performances of HCl and CO2 by using different absorbents in the RSR were explored. It was observed that the absorption of HCl by both water and alkali solution in the RSR demonstrated negligible disparities. This may be attributed to the high liquid-side mass-transfer coefficient in the RSR, which mitigated the intensification effect of the reaction on the mass transfer of HCl. According to these findings, a selective absorption process for HCl from a gas mixture containing CO2 employing an alkali solution during a recycle operation in the RSR was implemented. This process facilitated the desorption of CO2 absorbed in the initial stage by lowering the final pH during the recycling operation, resulting in zero consumption of alkali by CO2. Although the process based on the packed column can selectively absorb HCl by intensification such as multiple columns in series, the smaller size of RSR will save the cost of equipment investment.

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Section: Introductionmentioning

confidence: 99%

Selective Absorption of HCl from a Gas Mixture with CO₂ by Alkali Solution in a Rotor–Stator Reactor

Xiao,

Wu,

Song

et al. 2024

Ind. Eng. Chem. Res.

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Optimizing carbonation reaction parameters of calcium carbide slag in acidic/alkaline environment enhancing CO2 mineralization efficiency

Pan,

Chen,

Cao

et al. 2024

Chemical Engineering Journal

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A review of utilizing carbide slag to sequestrate carbon dioxide by mineral carbonation: Mechanisms, processes, and value-added products

Wang,

Lin,

Zhang

et al. 2025

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Integrated high-gravity process for HCl removal and CO2 capture using carbide slag slurry in a rotor-stator reactor: Experimental and modeling studies

Cited by 4 publications

References 33 publications

Selective Absorption of HCl from a Gas Mixture with CO₂ by Alkali Solution in a Rotor–Stator Reactor

Selective Absorption of HCl from a Gas Mixture with CO₂ by Alkali Solution in a Rotor–Stator Reactor

Optimizing carbonation reaction parameters of calcium carbide slag in acidic/alkaline environment enhancing CO2 mineralization efficiency

A review of utilizing carbide slag to sequestrate carbon dioxide by mineral carbonation: Mechanisms, processes, and value-added products

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Integrated high-gravity process for HCl removal and CO2 capture using carbide slag slurry in a rotor-stator reactor: Experimental and modeling studies

Cited by 4 publications

References 33 publications

Selective Absorption of HCl from a Gas Mixture with CO2 by Alkali Solution in a Rotor–Stator Reactor

Selective Absorption of HCl from a Gas Mixture with CO2 by Alkali Solution in a Rotor–Stator Reactor

Optimizing carbonation reaction parameters of calcium carbide slag in acidic/alkaline environment enhancing CO2 mineralization efficiency

A review of utilizing carbide slag to sequestrate carbon dioxide by mineral carbonation: Mechanisms, processes, and value-added products

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Selective Absorption of HCl from a Gas Mixture with CO₂ by Alkali Solution in a Rotor–Stator Reactor

Selective Absorption of HCl from a Gas Mixture with CO₂ by Alkali Solution in a Rotor–Stator Reactor