Amine-functionalized ultramicroporous metal-organic framework for efficient propylene/propane separation

The separation of propylene/propane (C3H6/C3H8) through an energy-efficient way is a crucial task in the petrochemical industry. However, it remains highly challenging because of their striking similarities between C3H6 and C3H8. Here we report an amine-Functionalized ultramicroporous metal-organic framework (MOF) Zn2(atz)2(ipa) with pH stability. In addition, Zn2(atz)2(ipa) possesses ability to absorb a large number of C3H6 at low pressure. The experience has shown that the high C3H6/C3H8 separation efficiency contributes to its suitable pore shape as well as firm bonding force with exposed –NH2 groups in the pore aperture. The strong affinity towards C3H6 and weak affinity towards C3H8 lead Zn2(atz)2(ipa) to high selectivity under ambient conditions. This work renders a fresh solution to product polymer-grade C3H6 through physical adsorption by MOFs.