基于NaOH溶液CO₂膜吸收系统的膜结构及传质性能

Carbon capture and utilization is an effective way to achieve the carbon reduction target. Gas absorption by alkaline solution on membrane can store CO₂ in the form of HCO^-₃ and CO^-₃, and the solution can be further used to convert the absorbed CO₂ into clean fuels. The structure and mass transfer characteristics of PTFE, PVDF, PP membranes in the membrane absorption of CO₂ by NaOH solution were investigated by single-sided membrane immersion and mass transfer experiments. The results showed that the swelling rates of PTFE and PP membranes in NaOH solution increased, and their pore size, porosity, hydrophobicity and mass transfer coefficient decreased. The mass transfer coefficient of PVDF membrane system was close to that of absorption without membrane, which could be attributed to the reaction between the membrane and NaOH solution, causing the structure damage and inability to function as the phase-interface.