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More than 99% CO2 recovery ratio with low energy consumption in CO2 recovery and methanation system (C-LOOP) was achieved.

A study conducted by Seiichi Kunitomi et al., was published in the Journal of CO2 Utilization.
In order to reduce CO2 emissions, it is necessary to recover and reuse CO2 generated in combustion facilities such as industrial furnaces. A C-LOOP system was constructed that captured CO2 in the exhaust gas using the physical adsorption method and synthesized methane from the recovered CO2 and hydrogen derived from renewable energy. This system required heating and depressurization to desorb CO2 from the adsorber, which consumes a large amount of energy. This study achieved more than 99% CO2 recovery ratio with 1.4 GJ/ton-CO2 energy consumption by supplying heat generated in the methanation reactor and reducing CO2 partial pressure through H2 sweeping. This achievement indicates significant prospects for realizing zero CO2 emissions from factories.

Title: Low-energy-consumption CO2 Recovery by Combining H2 Sweeping and Methanation with the Conventional VTSA Approach
Authors: Kunitomi, S., Ogasawara, K., Narita, H., Yamamoto, S.
Journal Name: Journal of CO2 Utilization
Published: May 12, 2023
https://doi.org/10.1016/j.jcou.2023.102482

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