Separation of C4 paraffins and C4 olefins from each other is an underdeveloped sector of membrane gas separation. Permeabilitieis, diffusivities and solubilities of C4 paraffins (i.e. n-butane and isobutane) and C4 olefins (i.e. cis-2-butene, trans 2-butene, 1-butene, isobutylene and 1,3-butadiene) in three commercial polymers- PEBAX 2533, PolyActive1500PEGT77PBT23 and PolyActive4000PEGT77PBT23 are reported in this study for the first time. The aim of this study is to thoroughly understand the single gas permeation mechanism of the C4 paraffins and C4 olefins through the multiblock copolymers. The cohesive energy density of the polyether segments plays a vital role to determine the permeabilities through the polymer. The selectivity of the olefin/paraffin gas pairs are largely dependent on the content of the ether oxygen of the polyether segments. But the selectivity of the paraffin gas pair and the olefin isomer gas pairs are not influenced by the ether oxygen content of the polyether segments of the multiblock copolymers.

C4 链烷烃和 C4 烯烃彼此的分离是膜气体分离的欠发达领域。C4 链烷烃（即正丁烷和异丁烷）和 C4 烯烃（即顺式）的渗透率、扩散率和溶解度-2-丁烯、反式 2-丁烯、1-丁烯、异丁烯和 1,3-丁二烯）在三种商业聚合物 - PEBAX 2533、PolyActive1500PEGT77PBT23 和 PolyActive4000PEGT77PBT23 中首次在本研究中进行了报道。本研究的目的是彻底了解 C4 链烷烃和 C4 烯烃通过多嵌段共聚物的单一气体渗透机理。聚醚链段的内聚能密度对于确定聚合物的渗透率起着至关重要的作用。烯烃/链烷烃气体对的选择性在很大程度上取决于聚醚链段中醚氧的含量。但是链烷烃气体对和烯烃异构体气体对的选择性不受多嵌段共聚物的聚醚链段的醚氧含量的影响。