Carbon dioxide capture by using hybrid system. Parametric sensitivity analysis and environmental and energy evaluation

Global warming is mainly caused by carbon dioxide (CO2). 2 ). When dealing with natural gas streams containing high concentrations of CO2, 2 , a combination of different technologies, such as absorption, adsorption, membrane, and cryogenic separation, can offer a more convenient and effective mean for separating acid gas. This study focuses on a gas stream that contains 81.14 mole % of CO2. 2 . Two hybrid processes, membrane-absorption with amines and cryogenic-membrane, were evaluated for their capital cost, energy and water consumption, and greenhouse gas (GHG) emissions under different operational conditions. This assessment was carried out using ASPEN HYSYS V.12. The membrane-absorption system demonstrates the least CH4 4 losses, while the hybrid cryogenic-membrane system displayed reduced energy and water requirements and 69 % less GHG emissions than the membrane-amine hybrid system. The cryogenic-membrane system is suitable for enhanced oil recovery (EOR) due to its high purity CO2 2 output and 30 % lower operational costs, although requiring a slightly higher initial investment.