Construction of Fluorinated Propane-Trap in Metal-Organic Frameworks for Record Polymer-Grade Propylene Production under High Humidity Conditions.
basic_science · Level V
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- Record sourced from PubMed, PMID 36659826.
- Also identified by DOI 10.1002/adma.202207955.
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Abstract
Propane/propene (C<sub>3</sub> H<sub>8</sub> /C<sub>3</sub> H<sub>6</sub> ) separation is essential in the petrochemical industry but challenging because of their similar physical and chemical properties. Adsorptive separation with C<sub>3</sub> H<sub>8</sub> -selective porous materials can energy-efficiently produce high-purity C<sub>3</sub> H<sub>6</sub> , 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<sub>3</sub> H<sub>8</sub> -trap is successfully constructed. FDMOF-2 exhibits an unprecedented C<sub>3</sub> H<sub>8</sub> capture capacity of 140 cm<sup>3</sup> cm<sup>-3</sup> and excellent C<sub>3</sub> H<sub>8</sub> /C<sub>3</sub> H<sub>6</sub> (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<sub>3</sub> H<sub>8</sub> , enabling excellent binding affinities. Breakthrough experiments demonstrate that C<sub>3</sub> H<sub>8</sub> can be directly extracted from various C<sub>3</sub> H<sub>8</sub> /C<sub>3</sub> H<sub>6</sub> mixtures with FDMOF-2, affording an outstanding C<sub>3</sub> H<sub>6</sub> production (501 mmol L<sup>-1</sup> ) 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.