Asymmetric modified carbon molecular sieve hollow fiber membranes having improved permeance

The present invention provides an asymmetric modified CMS hollow fiber membrane having improved gas separation performance properties and a process for preparing an asymmetric modified CMS hollow fiber membrane having improved gas separation performance properties. The process comprises treating a polymeric precursor fiber with a solution containing a modifying agent prior to pyrolysis. The concentration of the modifying agent in the solution may be selected in order to obtain an asymmetric modified CMS hollow fiber membrane having a desired combination of gas permeance and selectivity properties. The treated precursor fiber is then pyrolyzed to form an asymmetric modified CMS hollow fiber membrane having improved gas permeance. 本发明涉及具有改善的渗透性的不对称的改性碳分子筛中空纤维膜。具体地说，本发明提供具有改善的气体分离性能性质的不对称的改性CMS中空纤维膜以及用于制备具有改善的气体分离性能性质的不对称的改性CMS中空纤维膜的工艺。所述工艺包括将聚合物前体纤维在热解之前用包含改性剂的溶液处理。可选择所述溶液中的所述改性剂的浓度以获得具有气体渗透性和选择性性质的期望组合的不对称的改性CMS中空纤维膜。然后使所述经处理的前体纤维热解以形成具有改善的气体渗透性的不对称的改性CMS中空纤维膜。