Construction of Fluorinated Propane-Trap in Metal–Organic Frameworks for Record Polymer-Grade Propylene Production under High Humidity Conditions
Propane/propene (C 3 H 8 /C 3 H 6 ) separation is essential in the petrochemical industry but challenging because of their similar physical and chemical properties. Adsorptive separation with C 3 H 8 -selective porous materials can energy-efficiently produce high-purity C 3 H 6 , which is highly promising for replacing conventional cryogenic distillation but suffers from unsatisfactory performance. Herein, through the precise incorporation of fluorinated functional groups into the confined pore space, a new fluorinated metal–organic framework (FDMOF-2) featuring the unique and strong C 3 H 8 -trap is successfully constructed. FDMOF-2 exhibits an unprecedented C 3 H 8 capture capacity of 140 cm 3 cm −3 and excellent C 3 H 8 /C 3 H 6 (1:1, v/v) selectivity up to 2.18 (298 K and 1 bar), thus setting new benchmarks for all reported porous materials. Single-crystal X-ray diffraction studies reveal that the tailored pore confinement in FDMOF-2 provides stronger and multiple attractive interactions with C 3 H 8 , enabling excellent binding affinities. Breakthrough experiments demonstrate that C 3 H 8 can be directly extracted from various C 3 H 8 /C 3 H 6 mixtures with FDMOF-2, affording an outstanding C 3 H 6 production (501 mmol L −1 ) with over 99.99% purity. Benefiting from the robust framework and hydrophobic ligands, the separation performance of FDMOF-2 can be well maintained even under 70% relative humidity conditions.
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