Membrane gas separation is an energy-efficient approach to extract helium from natural gas.However,the limited separation performance shown as Robeson’s upper bound has hindered the techno-economic feasibility.This s...Membrane gas separation is an energy-efficient approach to extract helium from natural gas.However,the limited separation performance shown as Robeson’s upper bound has hindered the techno-economic feasibility.This study introduces an advanced copolyimide membrane engineered for He extraction from natural gas.The membranes were facilely achieved by dip-coating theα-alumina substrates in the copolyimide solution followed by in situ thermal rearrangement.In addition to the rigid 5-amino-2-(4-aminobenzene)benzimidazole segments,the active ortho-hydroxyl groups were converted to benzoxazole rings,contributing to extra micropores.The membrane showed an improved mixture selectivity of 120 and He permeance of 23.5 GPU,far surpassing the performance of benchmark membranes for helium separation over CH_(4).The membrane also demonstrated long-term stability as evidenced by the continuous operation over 250 h.Additionally,the membrane exhibited resistance to impurities such as CO_(2) and C_(2)H6,enduring the asymmetric membranes promising for practical helium extraction from natural gas.展开更多
基金sponsored by the National Natural Science Foundation of China(Grant Nos.22378187,22178164,22035002)the Outstanding Young Fund of Jiangsu Province(Grant No.BK20240030)+2 种基金Jiangsu Provincial Carbon Peak Carbon Neutral Science and Technology Innovation Special Fund(Grant No.BE2022033)Jiangsu 333 High Level Talent Training Project,the Excellent Engineer Training Program of Nanjing Tech University(Grant No.ZYXM202405)the Science and Technology Project of Petro-China South-west Oil&Gasfield Company(Grant No.2024D112-03).
文摘Membrane gas separation is an energy-efficient approach to extract helium from natural gas.However,the limited separation performance shown as Robeson’s upper bound has hindered the techno-economic feasibility.This study introduces an advanced copolyimide membrane engineered for He extraction from natural gas.The membranes were facilely achieved by dip-coating theα-alumina substrates in the copolyimide solution followed by in situ thermal rearrangement.In addition to the rigid 5-amino-2-(4-aminobenzene)benzimidazole segments,the active ortho-hydroxyl groups were converted to benzoxazole rings,contributing to extra micropores.The membrane showed an improved mixture selectivity of 120 and He permeance of 23.5 GPU,far surpassing the performance of benchmark membranes for helium separation over CH_(4).The membrane also demonstrated long-term stability as evidenced by the continuous operation over 250 h.Additionally,the membrane exhibited resistance to impurities such as CO_(2) and C_(2)H6,enduring the asymmetric membranes promising for practical helium extraction from natural gas.
