Boundary Condition Effects On Polymeric Membrane Formation
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Boundary Condition Effects On Polymeric Membrane Formation
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Author : Diana Joyce Hellman
language : en
Publisher:
Release Date : 2000
Boundary Condition Effects On Polymeric Membrane Formation written by Diana Joyce Hellman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Membranes (Technology) categories.
Polymeric Membrane Formation By Phase Inversion
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Author : Naser Tavajohi
language : en
Publisher: Elsevier
Release Date : 2024-03-19
Polymeric Membrane Formation By Phase Inversion written by Naser Tavajohi and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-03-19 with Science categories.
Polymeric Membrane Formation by Phase Inversion brings together for the first time analysis of all the four main phase inversion techniques. Effective parameters in each technique are covered together with the methodologies needed to prepare advanced membranes for specific separations in both liquid and gas phases. Roll-to-roll casting, spinning hollow fiber, and electrospinning nanofibers are presented, along with an analysis of the impact of solvent toxicity, membrane production, and the source of raw materials on the environment. Describing a road map for designing different morphological characteristics to prepare specific membranes for special applications, the merits and disadvantages of each method are thoroughly explored and outlined along with the sustainability, scalability and economic perspectives of membrane formation. Providing easy reference for academic and industry professionals working in membrane engineering this is an essential resource. Analyzes membrane formation by phase inversion and modeling Includes state-of-the-art membrane formation methods and related characterization techniques Discusses solvent toxicity and sustainability issues of membrane production
Phase Field Modeling Of The Polymer Membrane Formation Process For Micro And Ultra Filtration
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Author : Michael Rosario Cervellere
language : en
Publisher:
Release Date : 2021
Phase Field Modeling Of The Polymer Membrane Formation Process For Micro And Ultra Filtration written by Michael Rosario Cervellere and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Porous polymer membrane filters are widely used in separation and filtration process. Micro- and ultra-filtration membranes are commonly used in biopharmaceutical applications such as filtering viruses and separating proteins from a carrier solution. The formation of these membrane filters via phase inversion is a complex and interconnected process where varying casting conditions can have a wide variety of effects on the final membrane morphol- ogy. Tailoring membrane filters for specific performance characteristics is a tedious and time consuming process. The time and length scales of membrane formation make it extremely difficult to experimentally observe membrane formation. Modeling the membrane formation process allows one to slow down time and closely observe the formation of complex pore net- works. This allows new understanding and visual representations of the effects of different casting conditions and the resulting pore networks that form. This dissertation presents two separate models for two different membrane formation processes - thermally induced phase separation (TIPS) and non-solvent induced phase sepa- ration (NIPS). The Phase-Field method is employed to model the mesoscopic morphological structures that emerge during membrane formation. The Cahn-Hilliard equation is used to capture the diffusive nature of membrane formation and the Flory-Huggins free energy of mixing describes the thermodynamic equilibriums of the polymer solutions. Large-scale two- and three-dimensional simulations are used for capturing the resulting pore morphology under various casting conditions. The model for TIPS evaluated different casting conditions for the membrane forming system PVDF/DPC (polyvinylidene fluoride/diphenyl carbonate). The effects of casting surface temperature, thermal conductivity, quench rate, and polymer concentration were in- vestigated. Isotropic thermal quenches were used to analyzed pore size and interconnectivity while varying the quench rate and polymer concentration. Anisotropic thermal quenches in which a constant temperature cooling surface is imposed at the top surface were used to an-alyze the pore size and formation of a dense pore region near the casting surface. Different polymer concentrations, casting surface temperatures, and polymer thermal conductivities were used to characterize their effects on pore morphology. The formation of a dense pore region occurs near the top surface and the thickness of this dense pore region is dependent on the previous mentioned casting conditions. The model for NIPS evaluated the effects of coagulation bath composition and polymer concentration on final membrane morphology for PES/NMP/Water (polyethersulfone/n- methyl-2-pyrrolidone/water). These simulations were then compared to handcast mem- branes of a similar membrane forming system for comparison the simulated structures. The NIPS model evaluated coagulation bath composition and polymer concentration and the resulting morphologies. Two and three dimensional simulations were used to look at cross section and top surface morphology respectively. The concentration of NMP in the co- agulation bath was varied to verify the predictive capabilities of the model. The resulting simulations of cross sections and top surfaces had good agreement with handcast membranes when NMP is added to the coagulation bath.
Hollow Fiber Membranes
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Author : Tai-Shung Chung
language : en
Publisher: Elsevier
Release Date : 2021-03-16
Hollow Fiber Membranes written by Tai-Shung Chung and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-03-16 with Technology & Engineering categories.
Hollow Fiber Membranes: Fabrication and Applications focuses on the fabrication and applications of hollow fiber membranes. The book amply discusses the fundamental theories and practical applications of hollow fiber membranes, covering membrane formation mechanisms, hollow fiber spinning techniques, and spinneret design and module fabrication. In addition, novel membrane processes and applications of hollow fiber membranes are introduced. Elaborates membrane formation mechanisms Illustrates novel hollow fiber fabrication techniques and processes Specifies practical spinneret design and module fabrication Reviews hollow fiber membranes spun from specialty polymers Discusses state-of-the-art hollow fiber membrane applications
Recent Developments In Forward Osmosis Processes
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Author : Rodrigo Valladares Linares
language : en
Publisher: IWA Publishing
Release Date : 2017-05-15
Recent Developments In Forward Osmosis Processes written by Rodrigo Valladares Linares and has been published by IWA Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-05-15 with Science categories.
Forward osmosis (FO) is an emerging membrane technology with a range of possible water treatment applications (desalination and wastewater treatment and recovery). Recent Developments in Forward Osmosis Processes provides an overview of applications, advantages, challenges, costs and current knowledge gaps. Commercial technology, hybrid FO systems for both desalination and water recovery applications have shown to have higher capital cost compared to conventional technologies. Nevertheless, due to the demonstrated lower operational costs of hybrid FO systems, the unit cost for each m3 of fresh water produced with the FO system are lower than conventional desalination/water recovery technologies (i.e. ultrafiltration/RO systems). There are key benefits of using FO hybrid systems compared to RO: • chemical storage and feed systems may be reduced for capital, operational and maintenance cost savings, • reduced process piping costs, • more flexible treatment units, • higher overall sustainability of the desalination process, while producing high quality water.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 2007
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Dissertations, Academic categories.
Nbs Special Publication
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Author :
language : en
Publisher:
Release Date : 1971
Nbs Special Publication written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Weights and measures categories.
Membrane Contactors Fundamentals Applications And Potentialities
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Author : Enrico Drioli
language : en
Publisher: Elsevier
Release Date : 2011-08-30
Membrane Contactors Fundamentals Applications And Potentialities written by Enrico Drioli and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-08-30 with Technology & Engineering categories.
Membrane Contactors: Fundamentals, Applications and Potentialities, Volume 11 covers new operations that could be efficiently used to improve the performance of a variety of industrial production cycles in applications ranging from biotechnology to agrofood. This book focuses on the basic "principles of work": required membrane materials and properties; major operating parameters; the importance of module configuration and design and; the performance of membrane contactors in specific processes. The authors’ dynamic approach to this subject makes Membrane Contactors: Fundamentals, Applications and Potentialities, Volume 11 the most comprehensive book currently available on all aspects related to the 'membrane contactor world. * Describes new unit operations in process engineering * Covers a wide variety of industrial applications, from biotechnology to agrofood * Applicable to process intensification and sustainable growth strategies
Report
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Author : United States. National Bureau of Standards
language : en
Publisher:
Release Date : 1968
Report written by United States. National Bureau of Standards and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Hydraulic engineering categories.
Drexel Polymer Notes
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Author :
language : en
Publisher:
Release Date : 1988
Drexel Polymer Notes written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Polymerization categories.