Reliable Fabrication of Thin and (h0l)-Oriented Zeolite Al-beta Membranes for Separation of Methanol/Methyl tert-Butyl Ether Mixtures

Abstract

Dense, ∼1 μm thick and (h0l)-oriented zeolite Al-beta membranes have been successfully fabricated on randomly oriented seed layers by secondary growth in the fluoride medium. The incorporation of Al species into the zeolite framework is demonstrated by FTIR, EDS, and 29 Si and 27 Al MAS NMR measurements. The Al incorporation enhances the nucleation rate. The synthesized zeolite Al-beta membranes are applied in methanol/methyl tert-butyl ether (MeOH/MTBE) separation via pervaporation. It exhibits a high flux of 1.83 kg m −2 h −1 with respect to 20 wt % MeOH/ MTBE mixture at 50 °C, while the corresponding separation factor is 20.39. Compared with available zeolite membranes reported in the literature, the synthesized Al-beta membrane is more promising for MeOH/MTBE separation because of its high flux with a moderate separation factor.

High-Performance Co-Based ZIF-67 Tubular Membrane Achieved by ZnO-Induced Synthesis for Highly Efficient Pervaporation Separation of Methanol/Methyl tert-Butyl Ether Mixture

“…Comparison of the pervaporation performance of the ZIF-67 membrane with some polymeric membranes for separation of MeOH/MTBE mixture: PES-C, QPES, PELSC, SPES-C/PEI, [Cu 2 (bdc) 2 (bpy)] n /SPES, PHB, PLA, Al-beta, UiO-66, HPMA-GO, PVA/CA, CTA, CA filled with HZSM-5, PES-C/PVP, PVP, GO-polyimide …”

“…Thus, on the basis of its excellent separation performance and high stability, the developed ZIF-67 membrane is a promising candidate for the pervaporation separation of MeOH/MTBE mixture. 59 [Cu 2 (bdc) 2 (bpy)] n /SPES, 60 PHB, 61 PLA, 62 Al-beta, 11 UiO-66, 21 HPMA-GO, 53 PVA/CA, 63 CTA, 5 CA filled with HZSM-5, 54 PES-C/PVP, 64 PVP, 65 GO-polyimide. 66 Industrial & Engineering Chemistry Research…”

“…In comparison, inorganic membranes such as zeolite membranes become more and more attractive for pervaporation separation owing to their unique properties such as molecular-sized pores and high thermal and chemical stability. To date, there have been several attempts to prepare zeolite membranes such as NaY, 10 Al-beta, 11 and MFI 12 membranes, for the pervaporation separation of MeOH/MTBE mixture. Most membranes still show obvious trade-off effects in the pervaporation process, though great progress has been made.…”

Pervaporation Zeolite-Based Composite Membranes for Solvent Separations

“…Of course, zeolites have also been proposed to separate such organic-organic mixture with the need for methanol selective materials. For instance, Li et al [ 41 ] synthesized thin and (h0l)-oriented zeolite Al-beta membranes that had a highly hydrophilic nature (water contact angle of 45°). Such membranes demonstrated their efficiency and acceptable permeation with J and β values of 1.83 kg m −2 h −1 and 20, respectively.…”

Reactions of [Fe6C(CO)14(S)]2–: Cluster Growth, Redox, Sulfiding

“…This work began by examining redox reactions of [Fe 6 C(CO) 14 (S)] 2-([1] 2-). In CH 2 Cl 2 solution, (Ph 4 P) 2 [1] quantitatively transformed into [Fe 6 C(CO) 16 (S)] 0 ([2] 0 ) upon treatment with two equiv. of [Cp 2 Fe]BF 4 under an atmosphere of CO (Scheme 1) as confirmed by FT-IR spectrum.…”