The Experts below are selected from a list of 42 Experts worldwide ranked by ideXlab platform
George L. Semin - One of the best experts on this subject based on the ideXlab platform.
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Modelling of Pressure-Driven Membrane separation of electrolytes. 'High temperature' approximation
Journal of Membrane Science, 1998Co-Authors: Alexander G. Maryasov, George L. SeminAbstract:Abstract A model of Pressure-Driven Membrane Process of electrolyte separation is presented. The electric field potential assumed as being known, exact solution for permeate composition is readily obtained. All species are assumed to have the same convection velocity. Local electroneutrality condition is not used. The electric potential has been taken into account under high temperature approximation, thus reducing the problem to algebraic equation in exp(Ψ), where Ψ is dimensionless flow potential, and making it possible to calculate concentrations of ions in permeate. Negative retention is shown to be possible for one-component electrolyte solution. For electrolyte mixtures, concentration of ion with high charge is shown to “govern” the Membrane selectivity in respect to low-charge ions. Results obtained are in qualitative accordance with the earlier experimental data on Membrane separation of reaction mixtures in homogeneous catalysis.
Andrew G. Livingston - One of the best experts on this subject based on the ideXlab platform.
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2.3 Nanofiltration Operations in Nonaqueous Systems
Comprehensive Membrane Science and Engineering, 2017Co-Authors: Ludmila G. Peeva, Patrizia Marchetti, Andrew G. LivingstonAbstract:Nanofiltration is a Pressure-Driven Membrane Process used to remove solutes with molecular weight in the range of 200–2000 g mol−1, typically from aqueous streams. A relatively recent innovation is the extension of nanofiltration (NF) Processes to organic solvents (OSs)—an emerging technology referred to as organic solvent nanofiltration (OSN). Separation of molecules present in OSs by NF has great potential in industries ranging from refining to fine chemical and pharmaceutical synthesis, and OSN is currently an area of intensive investigation. This article summarizes the most recent developments in the field of OSN.
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Encyclopedia of Membrane Science and Technology - Organic Solvent Nanofiltration
Encyclopedia of Membrane Science and Technology, 2013Co-Authors: Gyorgy Szekely, Patrizia Marchetti, Maria F. Jimenez-solomon, Andrew G. LivingstonAbstract:Organic solvent nanofiltration (OSN) is a Pressure-Driven Membrane Process discriminating molecules in the range of 200-1000 Da, providing high quality products through gentle operating conditions. OSN has significant potential in chemical-related industries employing organic solvents including ionic liquids. The main advantages of OSN technologies include low energy consumption, operation time, and Process complexity as well as improved production sustainability, quality, and yield. The article seeks to provide insight into the state-of-the-art research in the field, including the development of new polymeric and ceramic OSN Membranes, modeling studies of the transport mechanisms through OSN Membranes, engineering of Membrane modules, development of new Membrane characterization techniques, and novel OSN application. Keywords: polymeric Membranes; ceramic Membranes; Membrane characterization techniques; transport modelling; mass transfer; concentration polarization; scale-up; ionic liquid recovery; pharmaceutical purification; catalyst recovery
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2.05 – Nanofiltration Operations in Nonaqueous Systems
Comprehensive Membrane Science and Engineering, 2010Co-Authors: Ludmila G. Peeva, M. Sairam, Andrew G. LivingstonAbstract:Nanofiltration is a Pressure-Driven Membrane Process used for removing solutes with molecular weight in the range of 200–1000 g mol−1, typically from aqueous streams. A recent innovation is the extension of nanofiltration Processes to organic solvents, an emerging technology referred to as organic solvent nanofiltration (OSN). The separation of molecules present in organic solvents by nanofiltration has great potential in industries ranging from refining to fine chemical and pharmaceutical synthesis and OSN is currently an area of intensive investigation. This chapter summarizes the most recent developments in the field of OSN. It describes the types of Membranes used in OSN and the methods for their preparation and characterization. An overview of the commercially available OSN Membranes, their separation properties, and manufacturers is also brought to the attention of the reader. Finally, a description of OSN applications at industrial and laboratory scale is presented.
Richard Mbaya - One of the best experts on this subject based on the ideXlab platform.
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Characterization and performance of nanofiltration Membranes
Environmental Chemistry Letters, 2014Co-Authors: Oluranti Agboola, Jannie Maree, Richard MbayaAbstract:The availability of clean water has become a critical problems facing the society due to pollution by human activities. Most regions in the world have high demands for clean water. Supplies for freshwater are under pressure. Water reuse is a potential solution for clean water scarcity. A Pressure-Driven Membrane Process such as nanofiltration has become the main component of advanced water reuse and desalination systems. High rejection and water permeability of solutes are the major characteristics that make nanofiltration Membranes economically feasible for water purification. Recent advances include the prediction of Membrane performances under different operating conditions. Here, we review the characterization of nanofiltration Membranes by methods such as scanning electron microscopy, thermal gravimetric analysis, attenuated total reflection Fourier transform infrared spectroscopy, and atomic force microscopy. Advances show that the solute rejection and permeation performance of nanofiltration Membranes are controlled by the composition of the casting solution of the active layer, cross-linking agent concentration, preparation method, and operating conditions. The solute rejection depends strongly on the solute type, which includes charge valency, diffusion coefficient, and hydration energy. We also review the analysis of the surface roughness, the nodule size, and the pore size of nanofiltration Membranes. We also present a new concept for Membrane characterization by quantitative analysis of phase images to elucidate the macro-molecular packing at the Membrane surface.
Alexander G. Maryasov - One of the best experts on this subject based on the ideXlab platform.
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Modelling of Pressure-Driven Membrane separation of electrolytes. 'High temperature' approximation
Journal of Membrane Science, 1998Co-Authors: Alexander G. Maryasov, George L. SeminAbstract:Abstract A model of Pressure-Driven Membrane Process of electrolyte separation is presented. The electric field potential assumed as being known, exact solution for permeate composition is readily obtained. All species are assumed to have the same convection velocity. Local electroneutrality condition is not used. The electric potential has been taken into account under high temperature approximation, thus reducing the problem to algebraic equation in exp(Ψ), where Ψ is dimensionless flow potential, and making it possible to calculate concentrations of ions in permeate. Negative retention is shown to be possible for one-component electrolyte solution. For electrolyte mixtures, concentration of ion with high charge is shown to “govern” the Membrane selectivity in respect to low-charge ions. Results obtained are in qualitative accordance with the earlier experimental data on Membrane separation of reaction mixtures in homogeneous catalysis.
Oluranti Agboola - One of the best experts on this subject based on the ideXlab platform.
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Characterization and performance of nanofiltration Membranes
Environmental Chemistry Letters, 2014Co-Authors: Oluranti Agboola, Jannie Maree, Richard MbayaAbstract:The availability of clean water has become a critical problems facing the society due to pollution by human activities. Most regions in the world have high demands for clean water. Supplies for freshwater are under pressure. Water reuse is a potential solution for clean water scarcity. A Pressure-Driven Membrane Process such as nanofiltration has become the main component of advanced water reuse and desalination systems. High rejection and water permeability of solutes are the major characteristics that make nanofiltration Membranes economically feasible for water purification. Recent advances include the prediction of Membrane performances under different operating conditions. Here, we review the characterization of nanofiltration Membranes by methods such as scanning electron microscopy, thermal gravimetric analysis, attenuated total reflection Fourier transform infrared spectroscopy, and atomic force microscopy. Advances show that the solute rejection and permeation performance of nanofiltration Membranes are controlled by the composition of the casting solution of the active layer, cross-linking agent concentration, preparation method, and operating conditions. The solute rejection depends strongly on the solute type, which includes charge valency, diffusion coefficient, and hydration energy. We also review the analysis of the surface roughness, the nodule size, and the pore size of nanofiltration Membranes. We also present a new concept for Membrane characterization by quantitative analysis of phase images to elucidate the macro-molecular packing at the Membrane surface.