膜分离法separation membrane利用气体各组分通过薄膜渗透性能的区别，将某种气体组分从气流中分离和提浓，达到脱酸气的目的。The gas components are separated and concentrated from the air flow by the difference of permeability through the film, so as to achieve the purpose of deacidification.适用于从天然气内分离出大量CO2的场合。从气体处理量小于280000m3/d的气流中脱除CO2有较好的经济性。It is suitable for extracting large amount of CO2 from natural gas. It is economical to remove CO2 from the gas flow capacity less than 280000m3/d.