Rapid preparation of high-silica CHA-type zeolite membranes and their separation properties

Imasaka, Satoshi; Itakura, Masaya; Yano, Kazuhiro; Fujita, Suguru; Okada, Masashi; Hasegawa, Yasumichi; Abe, Chie; Araki, Sadao; Yamamoto, Hideki

doi:10.1016/j.seppur.2018.01.046

Cited by 40 publications

(27 citation statements)

References 30 publications

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“…These propose that the effect of molecular sieving such as the DDR-, CHA-, and AEI-type zeolite membranes is effective for the CO2 separation from CH4, while the selective adsorption of CO2 is necessary for CO2-N2 mixtures. [25,27,28,32,34,42,43]. Figure 10.…”

Section: Binary Mixture Gas Permeationmentioning

confidence: 99%

Gas Permeation Properties of High-Silica CHA-Type Zeolite Membrane

et al. 2021

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The polycrystalline CHA-type zeolite layer with Si/Al = 18 was formed on the porous α-Al2O3 tube in this study, and the gas permeation properties were determined using single-component H2, CO2, N2, CH4, n-C4H10, and SF6 at 303–473 K. The membrane showed permeation behavior, wherein the permeance reduced with the molecular size, attributed to the effect of molecular sieving. The separation performances were also determined using the equimolar mixtures of N2–SF6, CO2–N2, and CO2–CH4. As a result, the N2/SF6 and CO2/CH4 selectivities were as high as 710 and 240, respectively. However, the CO2/N2 selectivity was only 25. These results propose that the high-silica CHA-type zeolite membrane is suitable for the separation of CO2 from CH4 by the effect of molecular sieving.

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Section: Binary Mixture Gas Permeationmentioning

confidence: 99%

Gas Permeation Properties of High-Silica CHA-Type Zeolite Membrane

et al. 2021

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“…To avoid difficulty and complexity, an excess amount of feed, which often reaches 100‐fold that of the permeated gas, is generally fed to a membrane module in the quest for a negligible change in the upstream flow rate and concentration along the membrane, 11,18 while single‐gas permeance can be obtained without the use of a significant amount of feed due to the lack of a change in the upstream partial pressure. Due to active research in recent years, membrane permeance has improved significantly to reach values larger than 10 −6 mol/(m 2 s Pa) 19‐21 . Recently, we also reported water vapor permeance of 5.5 × 10 −6 mol/(m 2 s Pa) and water flux of 37 kg/(m 2 h) during water/nitrogen separation at 150°C using a 1,2‐bis(triethoxysilyl) ethane‐derived silica membrane, which corresponds to permeated water flow rate of 2.4 L/min (standard temperature and pressure), even though the experiment was performed with a moderate partial pressure difference across the membrane of 107 kPa and a small membrane area of 0.00314 m 2 10 .…”

Section: Introductionmentioning

confidence: 92%

Evaluation of experimentally obtained permeance based on module simulation: How should permeance be evaluated?

et al. 2020

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Permeance and permeance ratio in binary separation generally are obtained from experimental data using an analytical permeance equation consisting of the logarithmic average of the partial pressure difference (hereafter, approximate permeance equation). The aim of the present study was to clarify the applicable range for this equation. First, the separation performance of a membrane module was calculated with various given membrane properties (permeance, permeance ratio) and operation conditions (pressure, flow rate) via numerical computation. The obtained concentrations and flow rates in the retentate and permeate were used to calculate permeances via approximate permeance equation, and the validity was discussed by comparing permeances used for numerical computation with obtained ones. The present work clarifies the validity of the approximate permeance equation, and yields a general guideline stipulating that the partial pressure difference across the membrane at the inlet and outlet should maintain more than 60% to obtain the correct permeance.

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“…CHA membranes have emerged more recently in the PV/VP arena and are manufactured by both Mitsubishi Chemical Corporation (Japan) and Hitachi Zosen Corporation (Japan) . Chabazite is a naturally occurring zeolite exhibiting a psuedohexagonal unit cell with ellipsoidal cages interconnected via 8‐member ring windows in the form of rhombohedral crystals .…”

Section: Inorganic Materialsmentioning

confidence: 99%

“…203,230 CHA membranes have emerged more recently in the PV/VP arena and are manufactured by both Mitsubishi Chemical Corporation (Japan) [231][232][233][234] and Hitachi Zosen Corporation (Japan). [235][236][237] Chabazite is a naturally occurring zeolite exhibiting a psuedohexagonal unit cell with ellipsoidal cages interconnected via 8-member ring windows in the form of rhombohedral crystals. 197,238,239 The maximum pore size of the 3D pore matrix for dehydrated CHA zeolites is 0.38 nm, falling between that of KA and NaA LTA zeolites.…”

Section: Linde Type a (Lta) Zeolitesmentioning

confidence: 99%

Review: membrane materials for the removal of water from industrial solvents by pervaporation and vapor permeation

Vane

2018

J of Chemical Tech & Biotech

109

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Organic solvents are widely used in a variety of industrial sectors. Reclaiming and reusing the solvents may be the most economically and environmentally beneficial option for managing spent solvents. Purifying the solvents to meet reuse specifications can be challenging. For hydrophilic solvents, water must be removed prior to reuse, yet many hydrophilic solvents form hard‐to‐separate azeotropic mixtures with water. Such mixtures make separation processes energy‐intensive and cause economic challenges. The membrane processes pervaporation (PV) and vapor permeation (VP) can be less energy‐intensive than distillation‐based processes and have proven to be very effective in removing water from azeotropic mixtures. In PV/VP, separation is based on the solution–diffusion interaction between the dense permselective layer of the membrane and the solvent/water mixture. This review provides a state‐of‐the‐science analysis of materials used as the selective layer(s) of PV/VP membranes in removing water from organic solvents. A variety of membrane materials, such as polymeric, inorganic, mixed matrix, and hybrid, have been reported in the literature. A small subset of these is commercially available and highlighted here: poly (vinyl alcohol), polyimides, amorphous perfluoro polymers, NaA zeolites, chabazite zeolites, T‐type zeolites, and hybrid silicas. The typical performance characteristics and operating limits of these membranes are discussed. Solvents targeted by the United States Environmental Protection Agency for reclamation are emphasized and ten common solvents are chosen for analysis: acetonitrile, 1‐butanol, N,N‐dimethyl formamide, ethanol, methanol, methyl isobutyl ketone, methyl tert‐butyl ether, tetrahydrofuran, acetone, and 2‐propanol. Published 2018. This article is a U.S. Government work and is in the public domain in the USA.

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Rapid preparation of high-silica CHA-type zeolite membranes and their separation properties

Cited by 40 publications

References 30 publications

Gas Permeation Properties of High-Silica CHA-Type Zeolite Membrane

Gas Permeation Properties of High-Silica CHA-Type Zeolite Membrane

Evaluation of experimentally obtained permeance based on module simulation: How should permeance be evaluated?

Review: membrane materials for the removal of water from industrial solvents by pervaporation and vapor permeation

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