ZIF-8@DBzPBI-BuI composite membranes for olefin/paraffin separation

Covalent‐Linking‐Enabled Superior Compatibility of ZIF‐8 Hybrid Membrane for Efficient Propylene Separation

“…[ 47 ] It is worth mentioning that good ZIF‐PIM compatibility and porous PIM‐1 endow ZIF‐8 86 ‐CN 14 @tPIM‐1 with top‐class selectivity among reported ZIF‐8 MMMs and most advanced permeability over the others (Figure 5c). [ 18–31 ] Another comparison with ZIF‐8 polycrystalline membranes shows that ZIF‐8 86 ‐CN 14 @tPIM‐1 has superior C 3 H 6 permeability and moderate competence in C 3 H 6 /C 3 H 8 selectivity (Table S5, Supporting Information). The selectivity–permeability points lie well above the latest upper bound, [ 48 ] and C 3 H 6 /C 3 H 8 selectivity (23.4) and C 3 H 8 permeance (≈22 GPU) are of the industrial interest for C 3 H 6 /C 3 H 8 separation from purge gas or olefin cracker according to selectivity and permeance requirements of 6–10/15–20 and 20–40 GPU.…”

“…The literature showed that the ZIF–polymer compatibility in ZIF‐8 MMMs was improved by matrix modification (i.e., synthesis of new polymer, post functionalization or binder addition). [ 15–27 ] Although the selectivity was increased, the permeability was largely sacrificed; however, high permeability is very demanding in membrane propylene separation. [ 32 ] ZIF‐8 functionalization is another method to modify the ZIF–polymer interfaces in MMMs; however, few studies have been reported on this phenomenon, [ 28–31 ] probably due to metal saturated coordination and ligand chemical inertness in the ZIF‐8 structure.…”

“…[ 12 ] Thus, ZIF‐8 has been explored as the filler to fabricate MMMs for this purpose. [ 13–31 ] In ZIF‐8 MMMs, the C 3 H 6 /C 3 H 8 selectivity is kinetically controlled by the ZIF‐8 fillers themselves. Thus, the interface engineering between ZIF‐8 and polymer is of paramount importance for tailoring the membrane selectivity because few phase‐boundary defects can severely suppress the selectivity for C 3 H 6 over C 3 H 8 .…”

Leveraging Nanocrystal HKUST-1 in Mixed-Matrix Membranes for Ethylene/Ethane Separation

“…However, doing so requires a complex coalition of both the petrochemical and biorefining industries, which will involve challenges including finding affordable feedstock access, enabling capabilities for industrial-scale commercialization and value-chain integration, as well as soliciting stable and supportive regulations by the government [10,11]. Regardless of how the industry eventually evolves, light hydrocarbon separation, such as the separation of ethylene from its paraffin counterpart, ethane (C 2 H 6 ), is deemed necessary after contaminants removal to give the precursor [12,13]. Essentially, ethylene/ethane (C 2 H 4 /C 2 H 6 ) separation is critical as the purity of the ethylene precursor directly influences the quality of the high-value commercial end-products.…”

Poly(ethylene oxide)/Ag ions and nanoparticles/1-hexyl-3-methylimidazolium tetrafluoroborate composite membranes with long-term stability for olefin/paraffin separation

“…22 In addition, membranes using ZIF and MOF have also been reported. [23][24][25][26][27][28][29][30][31][32] NPs formed therein. We reasoned that BMIM + BF 4 À would stabilize the smaller nascent Ag NPs, inhibiting their aggregation and thus maintaining membrane permeability.…”