Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Gas Membrane Characterization Via The Time Lag Method For Neat And Mixed Matrix Membranes
Download Gas Membrane Characterization Via The Time Lag Method For Neat And Mixed Matrix Membranes full books in PDF, epub, and Kindle. Read online Gas Membrane Characterization Via The Time Lag Method For Neat And Mixed Matrix Membranes ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Gas Membrane Characterization Via the Time-Lag Method for Neat and Mixed-Matrix Membranes by : Haoyu Wu
Download or read book Gas Membrane Characterization Via the Time-Lag Method for Neat and Mixed-Matrix Membranes written by Haoyu Wu and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Separation technologies with polymeric membranes are widely studied and have a wide range of applications. The membrane's heart is a dense selective layer whose permeability should strongly depend on the permeating species' properties. In turn, permeability depends on the diffusivity and solubility of the permeating species in the selective layer, which are considered intrinsic properties of the polymer forming the selective layer. When developing new membrane materials, the ultimate objective is to exceed the famous "upper bound" limit by achieving simultaneously higher selectivity and higher permeability. This objective is impossible without a reliable and accurate characterization method to determine the selective layer's intrinsic transport properties. The time-lag method is the most common membrane characterization technique, initially developed for polymeric membranes. However, as the membrane technology and material science advance, the selective layer structure becomes more complex and not limited to organic polymers. As a result, the time-lag method needs to be reviewed and adapted to these more complicated cases, which was the main objective of this thesis. Numerical simulation of dynamic gas permeation experiments is a powerful tool to examine different aspects of the time-lag method. Therefore, we have established a comprehensive variable-mesh finite-difference scheme, which was used throughout the thesis. It allowed us to investigate the effect of different random and resolution errors and an extrapolation error on the resulting time lag of an ideal membrane. We then considered more complex systems, particularly those of glassy polymers and mixed matrix membranes, to investigate the effect of different transport mechanisms on the results of dynamic and steady-state gas permeation experiments. In parallel, we also focused on developing a novel gas permeation system that would monitor dynamic gas permeation experiments based on pressure decay at the feed side. All the existing constant-volume gas permeation systems rely on monitoring pressure to rise at the membrane's permeate side. Although this work is still ongoing, we have made considerable progress. Among the numerous contributions made through this thesis, there are three of particular significance. We have developed an analytical model to predict mixed matrix membranes' relative permeability with the uniformly dispersed non-permeable fillers of different shapes. The model requires three structural parameters arising from the filler's shape and size, and it is superior to all existing analytical models, including the famous Maxwell model. We have also demonstrated that the diffusivity of mixed matrix membranes determined by the time-lag method depends on the number of layers of dispersed particles. In the limiting case of a single layer of uniformly impermeable fillers, it is possible for the diffusivity determined by the time-lag method to be greater than that of the host polymer, which might appear as counterintuitive in the absence of defects at the polymer-particle interface. In the case of glassy polymers, it is possible to observe an upward deviation from the steady-state flux, resulting from a non-instantaneous equilibrium between permeating species in Henry's and Langmuir adsorption sites.
Book Synopsis Mixed Matrix Membranes by : Clara Casado-Coterillo
Download or read book Mixed Matrix Membranes written by Clara Casado-Coterillo and published by MDPI. This book was released on 2019-12-16 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mixed matrix membranes (MMMs) have attracted a large amount of interest in research laboratories worldwide in recent decades, motivated by the gap between a growing interest in developing novel mixed matrix membranes by various research groups and the lack of large-scale implementation. This Special Issue contains six publications dealing with the current opportunities and challenges of mixed matrix membranes development and applications to solve environmental and health challenges of the society of 21st century.
Book Synopsis Membrane Characterization for Linear and Nonlinear Systems by : Neveen Alqasas
Download or read book Membrane Characterization for Linear and Nonlinear Systems written by Neveen Alqasas and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas separation with polymer membranes are becoming one of the mainstream separation techniques for a myriad of industrial applications. Membrane technologies are recognized as a viable and economical unit operation compared to more conventional separation processes. The design and material selection of membrane separation processes depends highly on the transport properties of separated gas molecules within the membrane material. Therefore, to use efficient methods for gas membrane characterization is paramount for the proper design of membrane separation processes. A membrane can be typically characterized by three main properties: permeability, solubility and diffusivity. The permeability of a membrane is the product of its diffusivity and solubility, therefore obtaining two of the three parameters is sufficient to fully characterize a membrane. The time-lag method is one of the oldest and most used gas membrane characterization methods. However, it suffers from various limitations that make the method not applicable for many types of membranes. The focus in this study was to develop new gas membrane characterization techniques that are based on extracting the membrane properties from the upstream gas pressure measurements rather than only from the downstream pressure measurements. It is believed that characterizing the membrane based on the upstream pressure measurements would be highly useful in characterizing barrier materials which are usually difficult to characterize using the conventional time-lag method. Moreover, glassy polymers which are widely used in industry exhibit behavior associated with nonlinear sorption isotherms and, therefore, the conventional time-lag method is incapable of obtaining an accurate estimation of glassy polymer properties. As a result, sorption experiments to generate a sorption isotherm are usually required in addition to permeation experiments to fully characterize glassy polymer membranes. To quantify the errors associated with the conventional time-lag assumptions and to fundamentally comprehend the impact of nonlinearities on the time-lag method, a comprehensive numerical investigation has been undertaken using the finite difference method. The investigation has clearly put in evidence the effect of the various Langmuir parameters on the accuracy of the time lag and on the time required to achieve steady state. This investigation also allowed assessing the errors associated with the usual assumptions made on the boundary conditions in determining the time lag. In this study, three novel gas membrane characterization methods were developed and proposed. Two of the proposed methods are concerned with the characterization of membranes that can be represented with a linear sorption isotherm. These two methods are entirely based on the upstream pressure measurements. The third membrane characterization method that is proposed is based on the dynamic monitoring of both upstream and downstream pressure measurements and is applicable to systems that exhibit a nonlinear isotherm sorption behavior. The three proposed methods are promising and further experimental validation is recommended to determine their full range of applicability.
Book Synopsis Gas Separation Membranes by : Ahmad Fauzi Ismail
Download or read book Gas Separation Membranes written by Ahmad Fauzi Ismail and published by Springer. This book was released on 2015-04-28 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the tremendous progress that has been made in the development of gas separation membranes based both on inorganic and polymeric materials. Materials discussed include polymer inclusion membranes (PIMs), metal organic frameworks (MOFs), carbon based materials, zeolites, as well as other materials, and mixed matrix membranes (MMMs) in which the above novel materials are incorporated. This broad survey of gas membranes covers material, theory, modeling, preparation, characterization (for example, by AFM, IR, XRD, ESR, Positron annihilation spectroscopy), tailoring of membranes, membrane module and system design, and applications. The book is concluded with some perspectives about the future direction of the field.
Book Synopsis Fundamental Aspects of Membrane Characterization by Constant Volume and Constant Pressure Techniques by : Siamak Lashkari
Download or read book Fundamental Aspects of Membrane Characterization by Constant Volume and Constant Pressure Techniques written by Siamak Lashkari and published by . This book was released on 2008 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Membrane Separation Processes by : Ahmad Fauzi Ismail
Download or read book Membrane Separation Processes written by Ahmad Fauzi Ismail and published by Elsevier. This book was released on 2021-10-15 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Membrane Separation Processes: Theories, Problems, and Solutions provides graduate and senior undergraduate students and membrane researchers in academia and industry with the fundamental knowledge on the topic by explaining the underlying theory that is indispensable for solving problems that occur in membrane separation processes. All major membrane processes are discussed, and an economic analysis is provided. Separation processes such as RO, UF, MF, RO, PRO and MD are thoroughly discussed. During the last two decades, the scope of the R&D of membrane separation processes has been significantly broadened. Other sections in the book cover membrane contactor and membrane adsorption. In addition, hybrid systems in which two or more membrane systems are combined are now being investigated for large-scale applications. Written by renowned experts with extensive experience with industry, education and R&D who have complementary expertise In-depth coverage of the most important conventional and emerging membrane processes Provides fundamental membrane theories for solving problems in separation processes without using complicated software
Book Synopsis Membrane Characterization by : Nidal Hilal
Download or read book Membrane Characterization written by Nidal Hilal and published by Elsevier. This book was released on 2017-02-20 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Membrane Characterization provides a valuable source of information on how membranes are characterized, an extremely limited field that is confined to only brief descriptions in various technical papers available online. For the first time, readers will be able to understand the importance of membrane characterization, the techniques required, and the fundamental theory behind them. This book focuses on characterization techniques that are normally used for membranes prepared from polymeric, ceramic, and composite materials.
Book Synopsis Gas Separation Membranes by : Ahmad Fauzi Ismail
Download or read book Gas Separation Membranes written by Ahmad Fauzi Ismail and published by Springer. This book was released on 2015-05-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the tremendous progress that has been made in the development of gas separation membranes based both on inorganic and polymeric materials. Materials discussed include polymer inclusion membranes (PIMs), metal organic frameworks (MOFs), carbon based materials, zeolites, as well as other materials, and mixed matrix membranes (MMMs) in which the above novel materials are incorporated. This broad survey of gas membranes covers material, theory, modeling, preparation, characterization (for example, by AFM, IR, XRD, ESR, Positron annihilation spectroscopy), tailoring of membranes, membrane module and system design, and applications. The book is concluded with some perspectives about the future direction of the field.
Book Synopsis Membranes For Gas Separations by : Moises A Carreon
Download or read book Membranes For Gas Separations written by Moises A Carreon and published by World Scientific. This book was released on 2017-08-11 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book aims at illustrating several examples of different membrane compositions ranging from inorganic, polymeric, metallic, metal organic framework, and composite which have been successfully deployed to separate industrially relevant gas mixtures including hydrogen, nitrogen, methane, carbon dioxide, olefins/parafins among others. Each book chapter highlights some of the current and key fundamental and technological challenges for these membranes that must be overcome in order to envision its application at industrial level.
Book Synopsis Synthesis and Characterization of Mixed Matrix Membranes for Gas Separation by : Yanfeng Zhang
Download or read book Synthesis and Characterization of Mixed Matrix Membranes for Gas Separation written by Yanfeng Zhang and published by . This book was released on 2007 with total page 562 pages. Available in PDF, EPUB and Kindle. Book excerpt: Short single-walled carbon nanotubes (SWNT) functionalized with carboxylic acid groups were made and incorporated into Matrimid ® to form mixed-matrix membranes. SEM images of mixed-matrix membranes cross-sections showed good dispersion and interfacial contact. Pure gas permeation showed 100% increase in permeability compared with pure Matrimid ®, while the ideal selectivity of O2 /N2, CO2 /CH4 and H2 /N2 remained unchanged. The higher permeability can be attributed to the higher diffusivity in the SWNT.
Book Synopsis Porous Polymer Networks by : Vikas Mittal
Download or read book Porous Polymer Networks written by Vikas Mittal and published by . This book was released on 2019-01-31 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main aim of the book is to assimilate the fundamental know how about the synthesis, properties as well as applications of a large range of recently developed and commercially viable porous polymer networks.
Book Synopsis Membrane Technology and Applications by : Richard W. Baker
Download or read book Membrane Technology and Applications written by Richard W. Baker and published by John Wiley & Sons. This book was released on 2004-05-31 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: Table of Contents Preface Acknowledgments for the first edition Acknowledgments for the second edition 1 Overview of Membrane Science and Technology 1 2 Membrane Transport Theory 15 3 Membranes and Modules 89 4 Concentration Polarization 161 5 Reverse Osmosis 191 6 Ultrafiltration 237 7 Microfiltration 275 8 Gas Separation 301 9 Pervaporation 355 10 Ion Exchange Membrane Processes - Electrodialysis 393 11 Carrier Facilitated Transport 425 12 Medical Applications of Membranes 465 13 Other Membrane Processes 491 Appendix 523 Index 535.
Book Synopsis Membrane Engineering for the Treatment of Gases by : Enrico Drioli
Download or read book Membrane Engineering for the Treatment of Gases written by Enrico Drioli and published by Royal Society of Chemistry. This book was released on 2017-10-06 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: Elaborating on recent and future developments in the field of membrane engineering, Volume 1 focuses on new membrane materials which have recently emerged in gas separation. Covering graphene/graphene oxide based membranes, PIMs, thermally rearranged membranes, and new mixed matrix membranes, alongside membrane pilot plant trials of gas separation, such as CO2 from flue gas and biogas, as well as a cost analysis of competitive membrane and hybrid systems, this book provides a comprehensive account. Together with Volume 2, these books form an innovative reference work on membrane engineering and technology in the field of gas separation and gaseous phase membrane reactors.
Book Synopsis Membrane Engineering for the Treatment of Gases: Gas-separation problems with membranes by : Enrico Drioli
Download or read book Membrane Engineering for the Treatment of Gases: Gas-separation problems with membranes written by Enrico Drioli and published by Royal Society of Chemistry. This book was released on 2011 with total page 319 pages. Available in PDF, EPUB and Kindle. Book excerpt: This two-volume set presents the state of the art, and potential for future developments, in membrane engineering for the separation of gases.
Book Synopsis Metal-organic Framework Membranes For Molecular Gas Separations by : Moises A Carreon
Download or read book Metal-organic Framework Membranes For Molecular Gas Separations written by Moises A Carreon and published by World Scientific. This book was released on 2020-07-30 with total page 283 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique compendium describes research progress on metal-organic framework (MOF) membranes for different relevant industrial gas separations. Specifically, the book focuses mainly on gas separations which are important in flue gas treatment, natural gas purification, hydrogen purification, and nuclear reprocessing. The advantages of using MOFs in mixed matrix membranes are discussed. Some of the pressing challenges in the field, and strategies to potentially overcome them are also distinctly outlined.This volume is a useful reference materials for professionals, academics, researchers and postgraduate students in chemical engineering and materials engineering.
Book Synopsis Cryptands And Cryptates by : Luigi Fabbrizzi
Download or read book Cryptands And Cryptates written by Luigi Fabbrizzi and published by World Scientific. This book was released on 2017-11-08 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cryptands were introduced by Jean-Marie Lehn in 1969 as cage-shaped selective ligands for alkali and alkaline-earth metal ions, which lie at the heart of supramolecular chemistry. This book reports on much of the research in the field since the '70s, and looks at, amongst other topics, metal coordination chemistry, anion coordination chemistry, the encapsulation and taming of reactive anions, the formation of cascade complexes and the design of fluorescent sensors for ionic analytes.Cryptands and Cryptates has been written as a coursebook, structured as a series of lectures for graduate students or advanced researchers in chemistry, materials science, chemical biology and nanotechnology. It is fully illustrated to show experiments and results, and is intended to stimulate further interest in this fertile field of supramolecular chemistry.Chapters are preceded by a Foreword by Jean-Marie Lehn.
Book Synopsis Polymeric Gas Separation Membranes by : Robert E. Kesting
Download or read book Polymeric Gas Separation Membranes written by Robert E. Kesting and published by Wiley-Interscience. This book was released on 1993-12-14 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Supplemented with over 200 helpful illustrations, this book offers an exposition of the chemical natures of hypothetical black box membranes and those of specific polymers. Chemical structure at the functional group level is considered as the synthesis of steric and polar factors.
