scholarly journals Synthesis of FAU-Zeolite Membrane by a Secondary Growth Method: Influence of Seeding on Membrane Growth and Its Performance in the Dehydration of Isopropyl Alcohol–Water Mixture

ACS Omega ◽  
2021 ◽  
Vol 6 (14) ◽  
pp. 9834-9842
Author(s):  
Masahiko Matsukata ◽  
Yasushi Sekine ◽  
Eiichi Kikuchi ◽  
Motomu Sakai ◽  
Bharathi Subramanian ◽  
...  
Keyword(s):  
Isopropyl Alcohol ◽  
Secondary Growth ◽  
Zeolite Membrane ◽  
Water Mixture ◽  
Fau Zeolite ◽  
Alcohol Water ◽  
Growth Method ◽  
Membrane Growth

Preparation of Membrane Zeolite MCM-22 and Evaluation Process Oil/Water Separation

2015 ◽  
Vol 820 ◽  
pp. 605-608
Author(s):  
A. Santos Barbosa ◽  
A.S. Barbosa ◽  
M.G.F. Rodrigues
Keyword(s):  
Continuous Flow ◽  
Membrane Separation ◽  
Secondary Growth ◽  
Evaluation Process ◽  
Zeolite Membrane ◽  
Water Separation ◽  
Oil Emulsion ◽  
X Ray ◽  
Growth Method ◽  
Oil Water

The objective of this work was prepared by secondary growth method, and evaluate the ability of the MCM-22 zeolite membrane separation system in oil / water in a continuous flow system. The zeolite membrane MCM-22 was characterized by different techniques: X-Ray Spectrometry Energy Dispersive (EDX), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). A continuous flow was used. The test for measuring mass flow of water / oil emulsion was conducted in peristaltic pump, wherein the membrane zeolite MCM-22 was tested. Through the results, we can observe the efficiency of the method used in the preparation of zeolite membrane and was also observed that the zeolite MCM-22 membrane, obtained by secondary growth method showed removal percentages equivalent to the standards required by Resolution 392 CONAMA.

scholarly journals Synthesis of tetraalkyl thiuram disulfides using different oxidants in recycling solvent mixture

2012 ◽  
Vol 18 (1) ◽  
pp. 73-81 ◽  
Author(s):  
Milutin Milosavljevic ◽  
Aleksandar Marinkovic ◽  
Jelena Markovic ◽  
Danijela Brkovic ◽  
Milan Milosavljevic
Keyword(s):  
Isopropyl Alcohol ◽  
Level Structure ◽  
Reaction Medium ◽  
Solvent Mixture ◽  
Azeotropic Mixture ◽  
Water Mixture ◽  
Alcohol Water ◽  
High Yields ◽  
Industrial Level ◽  
Laboratory Synthesis

A new optimized laboratory synthesis of tetraalkyl thiuram disulfides, starting from dialkyl amines and carbon disulfide in presence of three oxidants (hydrogen peroxide, potassium peroxodisulfate and sodium hypochlorite) and appropriate reaction medium: two mixtures of isopropyl alcohol - water used in two consecutive syntheses, was presented in this work. First synthesis was performed in a recycled azeotropic mixture of isopropyl alcohol - water 87.7% - 12.3%, and second in a filtrate obtained after first synthesis, which was a mixture of isopropyl alcohol - water 70.4% - 29.6%. After the second synthesis and filtration, recycled azeotropic mixture isopropyl alcohol - water 87.7% - 12.3% was regenerated from the filtrate by rectification. Considering this, the technology for beneficial use of recycling isopropyl alcohol - water mixture as reaction medium for tetraalkyl thiuram disulfides synthesis was developed. Such concept contributes to extraordinary economical benefit of implemented optimal laboratory synthesis at semi-industrial level. High yields of tetraalkyl thiuram disulfides syntheses were obtained at both laboratory and semiindustrial level. Structure and purity of synthesized compounds were confirmed by elemental analysis, as well as FTIR, 1H and 13C NMR, and MS spectral data.

Synthesis of a self-supporting faujasite zeolite membrane using geopolymer gel for separation of alcohol/water mixture

2014 ◽  
Vol 116 ◽  
pp. 167-170 ◽  
Author(s):  
Jin Zhang ◽  
Yan He ◽  
Yi-pin Wang ◽  
Jin Mao ◽  
Xue-min Cui
Keyword(s):  
Zeolite Membrane ◽  
Water Mixture ◽  
Alcohol Water ◽  
Faujasite Zeolite

scholarly journals Study the Effect of Seeding Suspension Concentration of DD3R Particles on the Modified Surface of Α-Alumina Support for Preparing DD3R Zeolite Membrane with High Quality

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Aynaz Meshkat ◽  
Mohammad Javad Vaezi ◽  
Ali Akbar Babaluo
Keyword(s):  
Secondary Growth ◽  
Dip Coating ◽  
Sem Analysis ◽  
Gas Permeation ◽  
Zeolite Membrane ◽  
Alumina Support ◽  
Suspension Concentration ◽  
Coating Method ◽  
Growth Method ◽  
Modified Surface

In this study, seeding of DD3R particles as an important step in the synthesis of DD3R membrane with secondary growth method was investigated. Dip-coating method is used for seeding of DD3R particles on the modified surface of α-alumina supports. 0.1, 0.2 and 0.3 wt% aqueous suspensions of the DD3R seeds were prepared and each support was coated three times with dipping time of 240 s. Scanning electron microscopy (SEM) analysis was used for the investigation of the quality of seed layer formed on the support. It is shown that the uniform layer of seeds was formed with 0.2 wt% seed suspension concentration. DD3R zeolite membrane was synthesized via hydrothermal method on the support seeded with 0.2 wt% seed suspension concentration. The X-ray diffraction and SEM analysis confirmed the synthesis of uniform DD3R zeolite membrane layer on the support which can be due to the uniform distribution of the DD3R seeds. Single gas permeation tests of N2, CO2 and CH4 were carried out, so that good perm-selectivity for gas mixtures was observed.

scholarly journals Facile Preparation of Bilayer Titanium Silicate (TS-1) Zeolite Membranes by Periodical Secondary Growth

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 850
Author(s):  
Qi Zhang ◽  
Yong Liu ◽  
Xuguang Liu ◽  
Laibo Ma
Keyword(s):  
Room Temperature ◽  
Secondary Growth ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Zeolite Membrane ◽  
Distribution Analysis ◽  
The Novel ◽  
Titanium Silicate ◽  
Water Contact ◽  
Growth Method

A facile periodical secondary growth method, based on conventional secondary growth, is proposed to prepare bilayer TS-1 membranes. The novel periodical secondary growth consists of two or several periods, which involve three steps: the temperature is programmed to a desired crystallization temperature as the first stage, followed by holding for a certain duration, and finally cooling to room temperature. This periodical crystallization model enables a bilayer TS-1 membrane to be produced, while the conventional secondary growth method produces a monolayer TS-1 membrane. The bilayer TS-1 membrane exhibits a superior defect-free structure and hydrophobic properties, as illustrated by SEM, gas permeance, pore size distribution analysis, and water contact angle measurement. It displays an earlier desalination separation factor compared to the monolayer TS-1 membrane. This work demonstrates that the periodical secondary growth is an advanced approach for preparing a bilayer zeolite membrane with excellent properties.

scholarly journals Catalytic combustion of isopropanol over Co–ZSM-5 zeolite membrane catalysts in structured fixed-bed reactor

2018 ◽  
Vol 5 (8) ◽  
pp. 180587 ◽  
Author(s):  
Xiaotong Zhang ◽  
Ying Yan
Keyword(s):  
Catalytic Combustion ◽  
Secondary Growth ◽  
Fixed Bed ◽  
Space Velocity ◽  
Catalytic Performance ◽  
Zeolite Membrane ◽  
Fixed Bed Reactor ◽  
Impregnation Method ◽  
Feed Concentration ◽  
Growth Method

Catalytic combustion of isopropanol in the structured fixed-bed reactor was investigated over Co–ZSM-5 zeolite membrane catalysts. Firstly, ZSM-5 zeolite membrane catalysts with different Si/Al ratios were coated onto the surface of stainless steel fibres via secondary growth method and wet lay-up paper-making method. Then, cobalt oxides were loaded onto the zeolite membranes by impregnation method. The performance of catalytic combustion of isopropanol was conducted over the prepared zeolite membrane catalysts, and the experimental results showed that the catalyst with infinite Si/Al ratio has the highest catalytic activity for the combustion with the lowest T 90 of isopropanol (285°C). Finally, the effects of bed structure, feed concentration, gas hourly space velocity and reaction temperature on the catalytic performance were investigated to analyse the kinetics of isopropanol over the catalyst with infinite Si/Al ratio in the structured fixed-bed reactor. The results showed that the longer residence time could cause higher reaction contact efficiency of isopropanol combustion. T 90 of isopropanol can be dramatically decreased by 105°C in the fixed-bed reactor packed with Co–ZSM-5 zeolite membrane catalysts, compared to the fixed-bed reactor packed with granular catalyst.

Synthesis of Potassium Ion Sieve Membrane by Secondary Growth Method

2011 ◽  
Vol 396-398 ◽  
pp. 2279-2284
Author(s):  
Li Hui Sun ◽  
Jun Sheng Yuan ◽  
Yun Peng Fu ◽  
Jin Hou ◽  
Kong Xiu Zhu
Keyword(s):  
Hydrothermal Synthesis ◽  
Secondary Growth ◽  
Potassium Ion ◽  
Zeolite Membrane ◽  
Ammonium Bromide ◽  
Tetrabutyl Ammonium Bromide ◽  
Tetrabutyl Ammonium ◽  
Growth Method ◽  
Α Al2o3

potassium ionic sieve membrane was synthesized employing the secondary hydrothermal synthesis using tetrabutyl ammonium bromide as templates on the porous α-Al2O3 support.The zeolite membrane were characterized by XRD and SEM. The results show that the prepared membranes is potassium ionic sieve membrane, dense and continuous membrane could be obtained after crystallization synthesis was carried out at 423K for 12h and for three times.

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