Fabrication And Application Of Zeolite Membranes

2002 ◽  
Vol 752 ◽  
Author(s):  
Hidetoshi Kita
Keyword(s):  
Microwave Heating ◽  
Porous Ceramic ◽  
Heating System ◽  
Zeolite Membrane ◽  
Conventional Heating ◽  
Organic Liquids ◽  
Zeolite Membranes ◽  
Tubular Type ◽  
Vapor Permeation ◽  
Type Zeolite

ABSTRACTZeolite Membranes Were Prepared On A Porous Ceramic Support By Hydrothermal Synthesis Using Conventional Heating System And Microwave Heating. Naa And T Type Zeolite Membranes Were Highly Selective For Permeating Water Preferentially With The High Permeation Flux, While Silicalite Membranes Exhibited Preferential Organic Compound Permeation From Water Such As Ethanol/Water. Nay And Nax Zeolite Membranes Showed A High Alcohol Selectivity For Several Feed Mixtures With Methanol Or Ethanol And A High Benzene Selectivity For Benzene/Cyclohexane And Benzene/N-Hexane Separation. The Performance Of The Zeolite Membranes Was The Most Favorable One For Pervaporation Membranes Which Have Been Published So Far And A Tubular Type Module Using A Type Zeolite Membrane For Dehydration Of Organic Liquids Has Been Put Into Industrial Operation. The Tubular Type Pervaporation And Vapor Permeation Module Can Produce 99.8 Wt% Ethanol From 600 L/H, 90 Wt% Ethanol Feed At 120 °C. For The Mass Production Of Zeolite Membrane A New Synthetic Method Using A Microwave Heating Is Also Proposed.

Vapor Permeation Properties of an NaY-Type Zeolite Membrane for Normal and Branched Hexanes

2002 ◽  
Vol 41 (7) ◽  
pp. 1768-1773 ◽  
Author(s):  
Byeong-Heon Jeong ◽  
Yasuhisa Hasegawa ◽  
Ken-Ichiro Sotowa ◽  
Katsuki Kusakabe ◽  
Shigeharu Morooka
Keyword(s):  
Zeolite Membrane ◽  
Vapor Permeation ◽  
Type Zeolite ◽  
Permeation Properties

scholarly journals Influence of Organic Solvent Species on Dehydration Behaviors of NaA-Type Zeolite Membrane

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 347
Author(s):  
Yasuhisa Hasegawa ◽  
Wakako Matsuura ◽  
Chie Abe ◽  
Ayumi Ikeda
Keyword(s):  
Ethanol Solution ◽  
Zeolite Membrane ◽  
Effect Of Temperature ◽  
Dimethyl Formamide ◽  
Permeation Flux ◽  
Vapor Pressures ◽  
Zeolite Membranes ◽  
Separation Factors ◽  
Type Zeolite

In this study, an NaA-type zeolite membrane was prepared, and the dehydration performances of the membrane were determined by the pervaporation for several organic solvents to understand the lower dehydration performances of zeolite membranes for NMP solutions than those for alcohols. For a 90 wt% ethanol solution at 348 K, the permeation flux and separation factor of the membrane were 3.82 kg m−2 h−1 and 73,800, respectively. The high dehydration performances were also obtained for alcohols and low boiling solvents (acetonitrile, acetone, methyl ethyl ketone (MEK) and tetrahydrofuran (THF)). However, the permeation flux and separation factors decreased significantly for high boiling solvents, such as N,N-dimethylacetamide (DMA), N,N-dimethyl formamide (DMF), dimethyl sulfoxide (DMSO) and N-methyl-2-pyrrolidone (NMP). The influences of the water content and temperature on the dehydration performances for the NMP solutions were determined to understand the lower dehydration performances for those solvents. Those results suggest that the lower dehydration performances for the high boiling solvents were attributed to the lower vapor pressures of water and the higher permeances of those solvents. Furthermore, this study proposes that the permeation behaviors through zeolite membranes could be understood by the determination of the effect of temperature on the permeance of individual components.

scholarly journals Development of Methanol Permselective FAU-Type Zeolite Membranes and Their Permeation and Separation Performances

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 627
Author(s):  
Ayumi Ikeda ◽  
Chie Abe ◽  
Wakako Matsuura ◽  
Yasuhisa Hasegawa
Keyword(s):  
Separation Factor ◽  
Carbon Number ◽  
Zeolite Membrane ◽  
Separation Performance ◽  
Solvent Mixtures ◽  
Permeation Flux ◽  
Aqueous Mixtures ◽  
Chemical Production ◽  
Zeolite Membranes ◽  
Type Zeolite

The separation of non-aqueous mixtures is important for chemical production, and zeolite membranes have great potential for energy-efficient separation. In this study, the influence of the framework structure and composition of zeolites on the permeation and separation performance of methanol through zeolite membranes were investigated to develop a methanol permselective zeolite membrane. As a result, the FAU-type zeolite membrane prepared using a solution with a composition of 10 SiO2:1 Al2O3:17 Na2O:1000 H2O showed the highest permeation flux of 86,600 μmol m−2 s−1 and a separation factor of 6020 for a 10 wt% methanol/methyl hexanoate mixture at 353 K. The membrane showed a molecular sieving effect, reducing the single permeation flux of alcohol with molecular size for single-component alcohols. Moreover, the permeation flux of methanol and the separation factor increased with an increase in the carbon number of the alcohols and methyl esters containing 10 wt% methanol. In this study, the permeation behavior of FAU-type zeolite membranes was also discussed based on permeation data. These results suggest that the FAU-type zeolite membrane has the potential to separate organic solvent mixtures, such as solvent recycling and membrane reactors.

【Rapid communications】 Preparation of Low Silica X-type Zeolite Membranes on Porous Support by Microwave Heating

MEMBRANE ◽  
2013 ◽  
Vol 38 (2) ◽  
pp. 97-100 ◽  
Author(s):  
Zhenzhuo Wang ◽  
Izumi Kumakiri ◽  
Kazuhiro Tanaka ◽  
Hidetoshi Kita
Keyword(s):  
Microwave Heating ◽  
Porous Support ◽  
Zeolite Membranes ◽  
Type Zeolite

Rare Earth Doped Y2O3:RE3+ (RE= Eu, Tm and Tb) Powder Phosphors Prepared by Microwave Heating Technique

2006 ◽  
Vol 517 ◽  
pp. 227-231 ◽  
Author(s):  
Izdihar Ishak ◽  
Alias Daud
Keyword(s):  
Microwave Heating ◽  
Conventional Method ◽  
Blue Emission ◽  
Green Emission ◽  
Heating System ◽  
Heating Time ◽  
Conventional Heating ◽  
X Ray Diffraction ◽  
Powder Samples ◽  
Suitable Technique

A simple microwave heating system was designed for firing phosphor samples. An 800W magnetron operating at 2.45 GHz was used. The system is capable of reaching 1200oC in less than three minutes with the help of SiC succeptor. The synthesis technique prior to the microwave heating is described. The results indicate that the samples start to crystallize after 5 minutes. The X-Ray diffraction (XRD) data indicates that the sample is polycrystalline and acquires the host structure. The Photoluminescence (PL) and Photoluminescence Excitation (PLE) spectra for the powder phosphor prepared show similar results as those prepared using the conventional method. The Y2O3 powder samples doped with Eu show strong red emission at 630nm, the Tb doped samples show a strong green emission at 550nm and Tm doped samples shows blue emission at 460nm. The Scanning Electron microscope (SEM) picture taken show that the crystal size of the microwave irradiated samples was smaller in comparison to those prepared using the conventional method. This may be due to shorter heating time. These results indicate that the microwave heating technique is a reliable, fast and suitable technique to produce these powder phosphors. The characteristics of the phosphors are as good as those prepared using the conventional heating technique.

scholarly journals The Analysis of Parametric Sensitivity Based on Designing and Optimization of a New Microwave Heating System

2017 ◽  
Vol 36 (8) ◽  
pp. 847-853 ◽  
Author(s):  
Hua Chen ◽  
Jin Zhang ◽  
Zebin Fan ◽  
Jinhui Peng ◽  
Shaohua Ju
Keyword(s):  
Microwave Heating ◽  
Heating System ◽  
Absorption Efficiency ◽  
Microwave Energy ◽  
Utilization Efficiency ◽  
Conventional Heating ◽  
Important Index ◽  
Energy Absorption Efficiency ◽  
Matching Performance ◽  
Heating Technology

AbstractMicrowave-assisted heating technology has become a popular alternative to conventional heating technologies because of its many advantages. However, the matching performance of microwave heating system is of particular concern because it provides an important index of the utilization efficiency of microwave energy. In this work, a new microwave heating system is designed by the theory of optical resonator in first. Then the comprehensive analysis of the mutual coupling of high sensitive geometrical and material parameters were investigated based on this new microwave heating system at 2.45 GHz. It is demonstrated that the thickness of materials dramatically influences microwave energy absorption efficiency and should be carefully considered and perhaps given priority. Moreover, it is shown that matching performance is the best when the titanium concentrates thickness at about 0.075 m.

scholarly journals Synthesis and Performance of Deca- Dodecasil 3 Rhombohedral (DDR)-Type Zeolite Membrane In CO2 Separation– A Review

2015 ◽  
Vol 14 (2) ◽  
pp. 48 ◽  
Author(s):  
Muhammad Mubashir ◽  
Yeong Yin Fong ◽  
Lau Kok Keong ◽  
Mohd. Azmi Bin Sharrif
Keyword(s):  
Secondary Growth ◽  
High Energy ◽  
Zeolite Membrane ◽  
Co2 Separation ◽  
Inorganic Membranes ◽  
Zeolite Membranes ◽  
Type Zeolite ◽  
And Performance ◽  
Cryogenic Distillation ◽  
Growth Methods

CO2 capture technologies including absorption, adsorption, and cryogenic distillation are reported. Conventional technologies for CO2 separation from natural gas have several disadvantages including high cost, high maintenance, occupy more space and consume high energy. Thus, membrane technology is introduced to separate CO2 due to their several advantages over conventional separation techniques. Inorganic membranes exhibit high thermal stability, chemical stability, permeability and selectivity for CO2 and CH4 separation as compared to other type of membranes. Zeolite membranes are potential for CO2 separation due to their characteristics such as, well define the pore structure and molecular sieving property. Among the zeolite membranes, DDR membranes exhibit highest selectivity for CO2 and CH4 separation. DDR membranes are synthesized by conventional hydrothermal and secondary growth methods. These methods required very long synthesis duration (25 days) due to extremely low nucleation and crystal growth rate of DDR zeolite. In this review, synthesis and performance of DDR membrane in CO2 separation from CH4 reported by various researchers are discussed. Challenges and upcoming guidelines related to the synthesis DDR membrane and performance of DDR membrane also included.

scholarly journals Preparation of Al-Containing ZSM-58 Zeolite Membranes Using Rapid Thermal Processing for CO2/CH4 Mixture Separation

Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 623
Author(s):  
Eiji Hayakawa ◽  
Shuji Himeno
Keyword(s):  
Thermal Processing ◽  
Rapid Thermal Processing ◽  
Zeolite Membrane ◽  
Porous Substrate ◽  
Zeolite Membranes ◽  
Template Removal ◽  
Molar Ratios ◽  
Mixture Separation ◽  
Type Zeolite ◽  
Reproducible Method

The synthesis of DDR-type zeolite membranes faces the problem of cracks that occur on the zeolite membrane due to differences in the thermal expansion coefficient between zeolite and the porous substrate during the detemplating process. In this study, Al-containing ZSM-58 zeolite membranes with DDR topology were prepared by rapid thermal processing (RTP), with the aim of developing a reproducible method for preparing DDR zeolite membrane without cracks. Moreover, we verified the influence of RTP before performing conventional thermal calcination (CTC) on ZSM-58 membranes with various silica-to-aluminum (Si/Al) molar ratios. Using the developed method, an Al-containing ZSM-58 membrane without cracks was obtained, along with complete template removal by RTP, and it had higher CO2/CH4 selectivity. An all-silica ZSM-58 membrane without cracks was obtained by only using the ozone detemplating method. ZSM-58 crystals and membranes with various Si/Al molar ratios were analyzed by using Fourier-transform infrared (FTIR) spectroscopy to confirm the effects of RTP treatment. Al-containing ZSM-58 zeolites had higher silanol concentrations than all-silica zeolites, confirming many silanol condensations by RTP. The condensation of silanol forms results in the formation of siloxane bonds and stronger resistance to thermal stress; therefore, RTP caused crack suppression in Al-containing ZSM-58 membranes. The results demonstrate that Al-containing ZSM-58 zeolite membranes with high CO2 permeance and CO2/CH4 selectivity and minimal cracking can be produced by using RTP.

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