Research on Decarburization of Offshore Platforms Based on Membrane–Cryogenic Distillation Coupling Technology

Under the “dual carbon” goals, offshore oil and gas development requires efficient CO2 reduction solutions. This study investigates a membrane–cryogenic distillation-coupled process for treating high-CO2-associated gas (40%–70% CO2). The experimental results demonstrate that the membrane unit enriches CO2 to over 80% under optimized pressure and temperature conditions. Subsequent cryogenic distillation further purifies CO2 to ≥95% with a recovery rate of 80%. The integrated system improves the overall recovery to 80%, reduces energy consumption, and decreases the equipment footprint by approximately 30% compared to conventional methods. This process demonstrates technical feasibility, along with economic and environmental benefits, for decarbonizing offshore gas production, supporting green development in the energy sector.