“…Membrane separation technology has great application potential due to its energy-efficient, cost effective, and environmentally friendly and compact design features com-pared to traditional separation methods, especially for large-scale gas separation. [4,7,8] Currently, few studies on 1,3-C 4 H 6 /other C 4 hydrocarbons have been reported and mainly focus on polymer membranes. Yamaguchi et al [9] fabricated a Nation 117-Na + membrane in 1996 and realized the separation of 1,3-C 4 H 6 from other C 4 hydrocarbons for the first time, the ideal selectivity of 1,3-C 4 H 6 /n-C 4 H 8 is 3.4 under conditions of 100% relative humidity, 0.84 bar feed pressure and 25 • C. Subsequently, Okamoto et al [10] prepared 6FDA-TrMPD, 6FDA-DDBT and PPO membranes for 1,3-C 4 H 6 /n-C 4 H 10 separation, and accordingly their ideal selectivity is 67, 190 and 33, with 1,3-C 4 H 6 permeability of 111, 6.5, and 4.2 Barrer, respectively, at 1.0 bar feed pressure and 50 • C. After that, Adachi et al [11] designed an Ag +doped Polyperfluorosulfonate membrane (PSM) membrane for n-C 4 H 8 /1,3-C 4 H 6 separation through the affinity difference between gas molecules and Ag + , and the highest ideal selectivity is 11.7 together with 1,3-C 4 H 6 permeability is 0.81 Barrer at 70 • C. Nevertheless, these polymer membranes unavoidably suffer from an undesirable trade-off limitation of permeability and selectivity, [8,12] resulting in high selectivity while extremely low permeability.…”