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