Microfluidic-based chemical absorption technology for CO2 capture: Mass transfer dynamics, operating factors and performance intensification.

Carbon capture, utilization, and storage (CCUS) is a crucial strategy for achieving CO 2 emission reduction targets and mitigating the impacts of global warming and climate change. Among various CCUS technologies, chemical absorption of CO 2 has proven to be a mature and widely-used technique in various industrial sectors. However, the current CO 2 chemical absorption process involves large-scale equipment with low efficiencies, making it difficult to control. To address these issues, microfluidic devices have emerged as a promising technology to intensify the CO 2 absorption process by providing a smaller required volume, enhanced mass transfer, cleaner and safer operations, higher productivity, and more efficient energy use. This paper aims at presenting a comprehensive literature review on research advances of the microfluidic technology for CO 2 chemical absorption. The review covers various aspects, including microchannel geometries, two-phase flow patterns, mass transfer models, effects of operating factors, and measures to intensify the CO 2 absorption process. In addition, the paper discusses the measurement of interfacial and local parameters, such as liquid film thickness, velocity field, and local CO 2 concentration, which are primordial for understanding the transport phenomena and for optimizing the CO 2 absorbers. This paper may serve as an essential reference that contributes to the development and exploitation of highly-efficient microfluidic-based CO 2 chemical absorption technology for future large-scale industrial applications. [Display omitted] • Recent researches on microfluidic-based CO 2 chemical absorption are reviewed. • Absorption performance is determined by the mass transfer between CO 2 and absorbent. • Effects of influencing operational factors are discussed. • Optical techniques are frequently used to measure local & interfacial parameters. • Different techniques used to intensify the CO 2 absorption process are surveyed. [ABSTRACT FROM AUTHOR]

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