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High-efficiency and low-energy-consumption CO2 capture through phase transition optimization via proton-lock mechanism.

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Title: High-efficiency and low-energy-consumption CO2 capture through phase transition optimization via proton-lock mechanism.
Authors: Meng, Haoyu1 (AUTHOR), Jiang, Bin1 (AUTHOR), Yang, Jiahao1 (AUTHOR), Chen, Meisi2 (AUTHOR), Zhang, Feng1 (AUTHOR) zf@nju.edu.cn, Zhang, Zhibing1,3 (AUTHOR) zbzhang@nju.edu.cn
Source: Chemical Engineering Journal. Sep2025, Vol. 519, pN.PAG-N.PAG. 1p.
Subjects: Carbon sequestration, Phase transitions, Carbon dioxide, Energy consumption, Ionic liquids
Abstract: A novel proton-lock mechanism was developed for CO₂ capture, utilizing a phase-transition process in a biphasic system. The mechanism integrates a protic ionic liquid (PIL) with a proton inhibitor (N , N , N ′, N ′-tetramethyl-1,6-hexanediamine, TMHDA), which facilitates the formation of stable bicarbonate species (80.28%) during CO 2 absorption. This approach significantly reduces regeneration energy consumption by nearly 48% compared to traditional monoethanolamine (MEA) solutions, with an energy demand of 1.785 GJ/t CO₂. The proton-lock mechanism effectively minimizes heat consumption and enhances the efficiency of the CO 2 absorption-regeneration cycle, making it a promising solution for large-scale industrial applications. By reducing the energy intensity typically associated with CO 2 capture, this innovative mechanism directly addresses both the environmental and energy challenges posed by conventional absorbents, contributing to more sustainable and energy-efficient carbon capture technologies. • The synergistic effect of TPH at the phase interface enhances CO 2 capture. • A novel proton-lock mechanism was proposed. • The PTH system exhibits significantly higher regeneration efficiency and lower energy consumption. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:A novel proton-lock mechanism was developed for CO₂ capture, utilizing a phase-transition process in a biphasic system. The mechanism integrates a protic ionic liquid (PIL) with a proton inhibitor (N , N , N ′, N ′-tetramethyl-1,6-hexanediamine, TMHDA), which facilitates the formation of stable bicarbonate species (80.28%) during CO 2 absorption. This approach significantly reduces regeneration energy consumption by nearly 48% compared to traditional monoethanolamine (MEA) solutions, with an energy demand of 1.785 GJ/t CO₂. The proton-lock mechanism effectively minimizes heat consumption and enhances the efficiency of the CO 2 absorption-regeneration cycle, making it a promising solution for large-scale industrial applications. By reducing the energy intensity typically associated with CO 2 capture, this innovative mechanism directly addresses both the environmental and energy challenges posed by conventional absorbents, contributing to more sustainable and energy-efficient carbon capture technologies. • The synergistic effect of TPH at the phase interface enhances CO 2 capture. • A novel proton-lock mechanism was proposed. • The PTH system exhibits significantly higher regeneration efficiency and lower energy consumption. [ABSTRACT FROM AUTHOR]
ISSN:13858947
DOI:10.1016/j.cej.2025.165658