Fabrication of zeolitic imidazolate frameworks based mixed matrix membranes and mass transfer properties of C₄H₆ and N₂ in membrane separation

Abstract

1,3‐Butadiene (BD) is a petrochemical‐based volatile organic compound, extensively used for the manufacture of synthetic rubber. There is no method reported for its recovery from nitrogen mixture. Herein, for the first time, BD is efficiently recovered by gas separation through facile and novel mixed‐metal ZIF‐8 based mixed matrix membranes (MMMs). Addition of Ni‐ZIF‐8 nanoparticles in PDMS matrix, significantly improved the penetrant‐membrane interactions and the solution‐diffusion properties of BD. Positron annihilation lifetime spectroscopy analysis showed that the well dispersion of Ni‐ZIF‐8 in PDMS enhanced the free volume of membrane and created efficient continuous paths for BD diffusion. Then, 15 wt% Ni‐ZIF‐8 MMM exhibited the BD permeance of 323 GPU and the BD/N2 ideal selectivity of 19.5, which were 60 and 81% higher than pure PDMS membrane, respectively. The simultaneous enhancement of BD permeance and BD/N2 ideal selectivity indicated that Ni‐ZIF‐8 was an effective filler applied in MMMs for efficient BD recovery.

Preparation ofZIF‐8—Pebax 1657 nanocomposite membranes forn‐hexane/nitrogen separation as a representative of gasoline vapour recovery

“…Liu et al [27] n-C [28] n-C 6 H 14 /N 2 3 Â 10 À3 * 25 26 0.258 101. 16 Liu et al [27] Pebax Haq et al [47] prepared Ni-ZIF-8-PDMS MMMs for C 4 H 6 /N 2 separation. At 15 wt.% loading of the Ni 2+ modified ZIF-8 nanoparticles, the 1,3-butadiene permeability and C 4 H 6 /N 2 selectivity were increased by 60% and 81%, respectively, compared with those of the pristine PDMS membrane.…”

“…At 15 wt.% loading of the Ni 2+ modified ZIF-8 nanoparticles, the 1,3-butadiene permeability and C 4 H 6 /N 2 selectivity were increased by 60% and 81%, respectively, compared with those of the pristine PDMS membrane. [47] Therefore, the polymer matrices/ inorganic filler particles hybrids, as a new highly efficient generation of membranes, show high potential for VOCs recovery/removal. It should be noted that due to the high flexibility and distinguished structural and performance properties of ZIF-8 nanoparticles, there many other studies [48][49][50][51][52][53] which incorporated them as the filler particles into different Pebax matrices and observed considerable improvement in the resultant nanocomposite membranes' gas/vapour separation performance compared with the pristine polymeric membrane.…”

“…At 10.0 wt.% loading of the ZIF‐8 nanoparticles in the PDMS matrix, the membrane selectivity for C 3 H 8 /N 2 septation increased by 38% compared with that of the pristine PDMS membrane, while its propane permeability decreased by 40%. [ 46 ] Haq et al [ 47 ] prepared Ni‐ZIF‐8–PDMS MMMs for C 4 H 6 /N 2 separation. At 15 wt.% loading of the Ni 2+ modified ZIF‐8 nanoparticles, the 1,3‐butadiene permeability and C 4 H 6 /N 2 selectivity were increased by 60% and 81%, respectively, compared with those of the pristine PDMS membrane.…”

Post‐synthesis amination of polymer of intrinsic microporosity membranes for CO2 separation

“…For diffusion, chain‐scission, crosslinking, metal oxide deposition, nucleophilic polycondensation, and post‐fabrication infiltration have been demonstrated with feasibility to tailor pore sizes and prepare PIM membranes with precise sieving properties 28–33 . Certainly, designing new PIM materials and adding fillers to form mixed matrix membranes are effective for ameliorating separation as well 34–39 . Although these techniques are promising, controlling sorption–diffusion process is still of greatly scientific interest and remains extremely challenging for separation membranes.…”

“…[28][29][30][31][32][33] Certainly, designing new PIM materials and adding fillers to form mixed matrix membranes are effective for ameliorating separation as well. [34][35][36][37][38][39] Although these techniques are promising, controlling sorption-diffusion process is still of greatly scientific interest and remains extremely challenging for separation membranes.…”