asymmetric membrane, process for preparing a hollow polyimide fiber membrane, and method of separating at least one gas from a gas mixture

摘要

asymmetric membrane, process for preparing a hollow polyimide fiber membrane, and method of separating at least one gas from a gas mixture. The present invention describes a novel type of polyimide membranes including hollow fiber membranes and high permeability flat sheet for air separation and a method of fabricating these membranes. the new hollow polyimide fiber membranes have a ~ 2 ~ permeability greater than 300 gpu and a ~ 2 ~ / n ~ 2 ~ selectivity greater than 3 at 60 198 and under 308 kpa for o ~ separation. 2 ~ / n ~ 2 ~. The new hollow polyimide fiber membranes also have a co-2 ~ permeability greater than 1000 gpu and a unique co-2 ~ / ch ~ 4 ~ gas selectivity greater than 20 at 50 198 c under 791 kpa for separation of co ~ 2 ~ / ch ~ 4 ~.