scholarly journals Potential Applications of Zeolite Membranes in Reaction Coupling Separation Processes

Materials ◽  
2012 ◽  
Vol 5 (11) ◽  
pp. 2101-2136 ◽  
Author(s):  
Michael Daramola ◽  
Elizabeth Aransiola ◽  
Tunde Ojumu
Keyword(s):  
Separation Processes ◽  
Zeolite Membranes ◽  
Potential Applications ◽  
Reaction Coupling

scholarly journals Hydrodynamic Boundary Layers at Solid Wall—A Tool for Separation of Fine Solids

2021 ◽  
Vol 5 (1) ◽  
pp. 11
Author(s):  
Ljubomir Nikolov
Keyword(s):  
Relative Density ◽  
Hydrodynamic Interaction ◽  
Theoretical Study ◽  
Solid Wall ◽  
Separation Processes ◽  
Starting Point ◽  
Potential Applications ◽  
Neutrally Buoyant ◽  
Solid Walls ◽  
Solid Spheres

A theoretical study is performed about the hydrodynamic interaction of fine species entrapped in the boundary layer (BL) at solid wall (plate). The key starting point is the analysis of the disturbance introduced by solid spheres in the background fluid flow. For a neutrally buoyant entity, the type of interaction is determined by the size of the spheres as compared to the thickness of the BL region. The result is granulometric separation of the solids inside the BL domain at the wall. The most important result in view of potential applications concerns the so-called small particles Rp < L/ReL5/4 (ReL is the Reynolds number of the background flow and Rp is the radius of the entrapped sphere). In the case of non-neutrally buoyant particles, gravity interferes with the separation effect. Important factor in this case is the relative density of the solid species as compared to this of the fluid. In view of further practical uses, particles within the range of Δρ/ρ < Fr2/ReL1/2 (Fr is Froude number and Δρ/ρ is the relative density of the entrapped solids) are systematically studied. The trajectories inside the BL region of the captured species are calculated. The obtained data show that there are preferred regions along the wall where the fine solids are detained. The results are important for the assessment of the general efficiency of entrapment and segregation of fine species in the vicinity of solid walls and have high potential for further design of industrial separation processes.

Fabrication and Potential Applications of Nanoporous Membranes for Separation Processes

2021 ◽  
pp. 119-171
Author(s):  
Oluranti Agboola ◽  
Patricia Popoola ◽  
Rotimi Sadiku ◽  
Samuel Eshorame Sanni ◽  
Damilola Elizabeth Babatunde ◽  
...  
Keyword(s):  
Nanoporous Membranes ◽  
Separation Processes ◽  
Potential Applications

scholarly journals Measurements of Activity Coefficients at Infinite Dilution for Organic Solutes in the Ionic Liquids N-Ethyl- and N-Octyl-N-methylmorpholinium Bis(trifluoromethanesulfonyl)imide. A Useful Tool for Solvent Selection

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 634 ◽  
Author(s):  
Łukasz Marcinkowski ◽  
Joachim Eichenlaub ◽  
Elham Ghasemi ◽  
Żaneta Polkowska ◽  
Adam Kloskowski
Keyword(s):  
Ionic Liquids ◽  
Organic Compounds ◽  
Activity Coefficients ◽  
Infinite Dilution ◽  
Retention Data ◽  
Separation Processes ◽  
Study Results ◽  
Conscious Choice ◽  
Potential Applications ◽  
Partial Molar Enthalpies

In recent years, many papers describing ionic liquids (IL) as promising solvents in separation techniques have been published. The conscious choice of appropriate ionic liquid as absorption media in effective extraction of selected types of analytes requires deeper understanding of the analyte−IL interactions. Therefore, intensive research is conducted to determine the values of activity coefficient at infinite dilution, which allows us to characterize the nature of these interactions. Based on the inverse gas chromatography retention data, activity coefficients at infinite dilution γ 13 ∞ of 48 different organic compounds in the ionic liquids N-ethyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide [C2C1Mor][TFSI] and N-octyl-N-methylmorpholinium bis(trifluoromethanesulfonyl)imide [C8C1Mor][TFSI] were determined. The measurements covered a broad range of volatile organic compounds, including n-alkanes, n-alkenes, n-alkynes, alcohols, aldehydes, ketones, aromatic compounds and common polar solvents, representing different types of interactions. Activity coefficients at infinite dilution were measured in the temperature range from 313.15 to 363.15 K. The excess partial molar enthalpies and entropies at infinite dilution were determined. Selectivity at infinite dilution was also calculated for exemplary separation processes in the hexane/benzene system. The obtained results were analyzed and compared with literature data for ionic liquids containing the same anion [TFSI]¯ and different cations. The study results indicate that some potential applications of the investigated ionic liquids in separation problems exist.

On the Optimization of Gas Separation Processes Using Zeolite Membranes

2003 ◽  
Vol 81 (5) ◽  
pp. 525-536 ◽  
Author(s):  
P. Vareltzis ◽  
E.S. Kikkinides ◽  
M.C. Georgiadis
Keyword(s):  
Gas Separation ◽  
Separation Processes ◽  
Zeolite Membranes

Preparing Sodium Methoxide from Sodium Hydroxide by Reaction Coupling with Separation Processes

2014 ◽  
Vol 986-987 ◽  
pp. 101-105 ◽  
Author(s):  
Meng Xiong ◽  
Cheng Xi Wang ◽  
Dan Dan Shao
Keyword(s):  
Sodium Hydroxide ◽  
Sodium Methoxide ◽  
Batch Reactor ◽  
Coupling Reaction ◽  
Sodium Hydroxide Concentration ◽  
Separation Processes ◽  
Reaction Phase ◽  
Different Temperatures ◽  
Reaction Coupling ◽  
Good Agreement

Preparing sodium methoxide by reacting sodium hydroxide with methanol was investigated. The chemical equilibrium constant was small. Removing water out of the reaction phase could drive the reaction to produce more sodium methoxide. The experiments were carried out at different temperatures and 1 atm in semi-batch reactor by liquid evaporating to remove water. The effects of initial sodium hydroxide concentration and liquid evaporating speed were discussed. A mathematical model coupling reaction with separation processes was built and the predicted results by the model were in good agreement with experiment results. The model provides useful information for industrial simulation.

Current Approaches of Nanotechnology for Potential Drinking Water Purification

2020 ◽  
pp. 307-324
Author(s):  
Rohini Singh ◽  
Suman Dutta
Keyword(s):  
Drinking Water ◽  
Water Purification ◽  
Membrane Separation ◽  
Microbial Control ◽  
Toxic Metal ◽  
Separation Processes ◽  
Innovative Methods ◽  
Potential Applications ◽  
Contaminated Drinking Water ◽  
Drinking Water Purification

Uninterrupted supply of adequate and clean drinking water is a fundamental human necessity, and essential to maintain the healthy surroundings. It also influences the development and economic growth, specifically in developing countries. It provides an excellent opportunity for treatment of surface water, groundwater, and wastewater contaminated by toxic metal ions, organic and inorganic solutes, and microorganisms. It facilitates an opportunity to optimize the current conventional techniques and to offer novel and innovative methods of water purification. Various nanomaterials on which purification of contaminated drinking water is based includes nanostructured catalytic membranes, nanosorbents, nanocatalysts, and bioactive nanoparticles. Current and potential applications of nanotechnology in water purification are adsorption, membrane separation processes, photocatalysis, disinfection, and microbial control. This chapter reviews the recent research efforts accomplished in the area of nanotechnology for drinking water purification.

scholarly journals Biopesticide Encapsulation Using Supercritical CO2: A Comprehensive Review and Potential Applications

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 4003
Author(s):  
Dário Rodrigues do Nascimento Junior ◽  
Antonio Tabernero ◽  
Elaine Christine de Magalhães Cabral Albuquerque ◽  
Silvio Alexandre Beisl Vieira de Melo
Keyword(s):  
Supercritical Co2 ◽  
Separation Processes ◽  
Nontarget Organisms ◽  
Advantages And Disadvantages ◽  
Supercritical Fluid Technology ◽  
Potential Applications ◽  
Synthetic Pesticides ◽  
Living Organisms ◽  
Carbon Dioxide Co2 ◽  
And Control

As an alternative to synthetic pesticides, natural chemistries from living organisms, are not harmful to nontarget organisms and the environment, can be used as biopesticides, nontarget. However, to reduce the reactivity of active ingredients, avoid undesired reactions, protect from physical stress, and control or lower the release rate, encapsulation processes can be applied to biopesticides. In this review, the advantages and disadvantages of the most common encapsulation processes for biopesticides are discussed. The use of supercritical fluid technology (SFT), mainly carbon dioxide (CO2), to encapsulate biopesticides is highlighted, as they reduce the use of organic solvents, have simpler separation processes, and achieve high-purity particles. This review also presents challenges to be surpassed and the lack of application of SFT for biopesticides in the published literature is discussed to evaluate its potential and prospects.

An in situ and ex situ TEM study of the formation of thin cobalt silicide films by molecular beam epitaxy on the silicon (100) surface

1988 ◽  
Vol 46 ◽  
pp. 884-885
Author(s):  
D. Loretto ◽  
J. M. Gibson ◽  
S. M. Yalisove ◽  
R. T. Tung
Keyword(s):  
Molecular Beam Epitaxy ◽  
Molecular Beam ◽  
Defect Density ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Ex Situ ◽  
Metal Base ◽  
In Situ Experiments ◽  
Potential Applications

The cobalt disilicide/silicon system has potential applications as a metal-base and as a permeable-base transistor. Although thin, low defect density, films of CoSi2 on Si(111) have been successfully grown, there are reasons to believe that Si(100)/CoSi2 may be better suited to the transmission of electrons at the silicon/silicide interface than Si(111)/CoSi2. A TEM study of the formation of CoSi2 on Si(100) is therefore being conducted. We have previously reported TEM observations on Si(111)/CoSi2 grown both in situ, in an ultra high vacuum (UHV) TEM and ex situ, in a conventional Molecular Beam Epitaxy system.The procedures used for the MBE growth have been described elsewhere. In situ experiments were performed in a JEOL 200CX electron microscope, extensively modified to give a vacuum of better than 10-9 T in the specimen region and the capacity to do in situ sample heating and deposition. Cobalt was deposited onto clean Si(100) samples by thermal evaporation from cobalt-coated Ta filaments.

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