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The CO₂ content is very high in the pre-salt natural gas (NG) reserves in Brazil, reaching values close to 60% in molar fraction. Offshore CO₂ separation is highly attractive for oil companies, as it facilitates CO₂ injection into the sea, reducing the amount of greenhouse gases released into the atmosphere. The most common devices for CO₂ separation, such as amine units and membrane modules, are more suitable for lower CO₂ percentages than those typically found in NG extracted from pre-salt reserves. Furthermore, the size of these devices increases with the amount of CO₂ removed, thus occupying a large area of the platform deck. Having a robust system that can be installed subsea, with low complexity and little need for maintenance, is of great interest to the oil and gas industry in Brazil, as it promotes CO₂ capture and facilitates CH₄ utilization.
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