Cho et al. (2025): Enhanced CO₂ capture using amine-based extractants in liquid-liquid hollow fiber membrane contactors for direct ocean carbon capture

Seong-Jun Cho, Ho Geun Jeong, Tae Hoon Choi, Soon Jin Kwon, Seong Uk Hong, Jong Hak Kim, Jae-Deok Jeon, IN: Desalination, https://doi.org/10.1016/j.desal.2025.119143

One of the novel direct ocean carbon capture (DOC) proposed to achieve negative carbon emissions is the liquid-liquid hollow fiber membrane contactor (LL-HFMC). The ocean, with a CO₂ concentration approximately 150 times higher than that of the atmosphere, provides a more energy-efficient and cost-effective alternative to direct air capture (DAC). Despite its advantages, there is a lack of research on the effects of membranes and extractants in the DOC process. This study aims to optimize extractants for LL-HFMC in the DOC process through a systematic evaluation of amine-based extractants. The performance of monoethanolamine (MEA), ethylenediamine (EDA), diethylenetriamine (DETA), and triethylenetetramine (TETA) were compared alongside sodium hydroxide (NaOH), a benchmark extractant in LL-HFMC processes. Polypropylene hollow fiber membranes were used as the contactor medium.

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