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Eric Favre

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Papers by Eric Favre

Maximizing Mass Transfer Using Highly Curved Helical Pipes: A CFD Investigation

Proceedings of the 6th International Conference on Fluid Flow, Heat and Mass Transfer (FFHMT'19), Jun 1, 2019

Membrane contactors are considered as one of the most promising intensification technologies for ... more Membrane contactors are considered as one of the most promising intensification technologies for gas-liquid absorption processes in food, chemistry, energy and pharmaceutical industries. Two strategies can be applied in order to push process intensification: maximize mass transfer coefficients and maximize the specific membrane surface area (i.e. packing density) of the module. Dean vortices generation is one of the most efficient way for mass transfer improvement but requires helical shape membranes. Consequently, a combined packing geometry and mass transfer study is needed in order to evaluate the optimal performances of helical hollow fiber membrane modules. This work aimed to achieve that target through a systematic analysis of mass transfer performances in highly curved hollow membrane contactors. The impact of the nondimensional numbers * , * (respectively the helical radius and helical pitch both nondimensionalized by the pipe diameter) on mass transfer was evaluated numerically by using CFD. Helical hollow fiber membranes with lengths ranging from 30 to 6000 , nondimensional helical diameters * between 0.05 and 10, and nondimensional helical pitches * between 1.25 and 15 were studied. In addition, mass transfer in packed membrane modules is analyzed thanks to a mass transfer enhancement factor , which is equal to the mass transfer ratio ℎ ∞ / ℎ ∞ (comparing the Sherwood number of helical and straight pipes) multiplied by the packing density ratio / (comparing the packing density of helical and straight pipes). It is shown that enhancement is maximal for highly curved helical pipes. For example, for a Schmidt number of 10, highly curved pipes allow reaching a ℎ ∞ value, which is about 4 times larger than that of a straight tube. For a Schmidt number 1000, the mass transfer efficiency can be enhanced by one order of magnitude.

Membrane separations and energy efficiency

Journal of Membrane Science

Membrane processes are usually considered to offer very promising performances in terms of energy... more Membrane processes are usually considered to offer very promising performances in terms of energy efficiency for industrial separations. This statement particularly holds for homogeneous gas and liquid separations which are traditionally performed thanks to unit operations based on a phase change (distillation, evaporation, condensation, crystallization…). The energy efficiency concept can however be addressed through different methodologies, potentially leading to different, if not opposite conclusions. A critical analysis of the energy efficiency concept for membrane separations is proposed. Starting from the most usual minimum work of separation definition, alternative expressions of this key concept are developed in order to better reflect the different types of separation situations encountered for practical purposes (solute purification and/or recovery, process selectivity). In a second step, the real work of separation of a given process, classically evaluated through modern Process Systems Engineering computations, including thermodynamic modelling and irreversible processes computations, is discussed. The interest of the entropy dissipation function, obtained from Irreversible Processes Thermodynamics (IPT) approach is then presented. The methodology is applied to the separation of a perfect gas mixture (air) and non ideal (seawater) liquid mixture. The local entropy dissipation rate offers the opportunity to analyze the impact of fluid distribution in membrane modules, possibly leading to improved designs through the entropy equipartition theory. The largely unexplored possibilities of IPT to provide a predictive evaluation of the overall energy efficiency of a separation process, based on a diffusional mass transfer mechanism, is finally illustrated.

Status and progress of membrane contactors in post-combustion carbon capture: A state-of-the-art review of new developments

Journal of Membrane Science, 2016

Post-combustion carbon capture (PCC), which can be retrofitted to existing units in power plants ... more Post-combustion carbon capture (PCC), which can be retrofitted to existing units in power plants worldwide, is regarded as the first technologically feasible and effective way to combat human-induced climate change. The membrane contactor is an emerging and promising membrane technology for PCC as it integrates the benefits of both liquid absorption (high selectivity) and membrane separation (modularity and compactness). This review aims to provide a state-of-the-art assessment of the research work carried out so far on membrane contactor technology in PCC. It details common aspects of membrane contactors, such as technological advantages, membrane wetting, mass transfer and module design, as well as new advances (e.g., new membranes and absorbents used in absorption processes) and novel applications (e.g., direct CO 2 stripping and integrated heat recovery in desorption processes). Moreover, the difference in performance between membrane absorption and conventional absorption is also compared and discussed. Lastly, we discuss the status and progress of membrane contactors in PCC and offer some recommendations for future work. This paper provides a clear overview on the recent developments of membrane contactor technology in PCC.

Adiabatic modelling of CO2 capture by amine solvents using membrane contactors

Journal of Membrane Science, 2015

ABSTRACT

Specialty Grand Challenges in Separation Processes

Frontiers in Chemical Engineering

Stripping of CO 2 in Post-combustion Capture with Chemical Solvents: Intensification Potential of Hollow Fiber Membrane Contactors

Energy Procedia

Post-combustion CO2 capture (PCC) is an important strategy in mitigating greenhouse effect. The r... more Post-combustion CO2 capture (PCC) is an important strategy in mitigating greenhouse effect. The robustness of packed columns makes it the standard technology for the gas-liquid absorption of CO2, using aqueous amine solutions as liquid absorbents. Even though it is not the best performing chemical solvent, monoethanolamine (MEA) at 30% wt. is currently considered as the benchmark solvent for PCC [1]. However, the treatment of large quantities of flue gases requires itself equipment of a large size. Hollow fibre membrane contactors (HFMC) are considered as one of the most promising strategies for intensified CO2 absorption process, due to their significantly higher interfacial area than that of packed columns, allowing to reduce the equipment size [2].

Data supporting the validation of a simulation model for multi-component gas separation in polymeric membranes

Data in Brief, 2016

The article describes data concerning the separation performances of polymeric hollow-fiber membr... more The article describes data concerning the separation performances of polymeric hollow-fiber membranes. The data were obtained using a model for simulating gas separation, described in the research article entitled "Interplay of inlet temperature and humidity on energy penalty for CO 2 postcombustion capture: rigorous analysis and simulation of a single stage gas permeation process" (L. Giordano, D. Roizard, R. Bounaceur, E. Favre, 2016) [1]. The data were used to validate the model by comparison with literature results. Considering a membrane system based on feed compression only, data from the model proposed and that from literature were compared with respect to the molar composition of permeate stream, the membrane area and specific energy requirement, varying the feed pressure and the CO 2 separation degree.

Cyclic Membrane Gas Separation Processes Assessment

ABSTRACT The analysis of membrane gas separation processes under transient conditions for practic... more ABSTRACT The analysis of membrane gas separation processes under transient conditions for practical applications is a rather unexplored domain. One of the main advantages of membrane processes compared to other separations is their ability to work under steady conditions, without any separate regeneration step. Nevertheless, unique separation performances can be obtained in some cases when a transient regime is applied. Paul explored this issue in a pioneering study, based on a cyclic process with synchronous valve operation. Followed by this initial work, more theoretical and experimental studies about the cyclic process have been performed. Some interests and also some drawbacks have been defined qualitatively. A general improved selectivity is highlighted with respect to a conventional process, together with a significant decrease on productivity. Thus, the trade-off between these two factors is the key issue to assess whether the cyclic process is competitive with respect to a conventional process. Based on Paul&#39;s process, a cyclic process for membrane gas separations is proposed in our study with more available operating possibilities and less modeling assumptions. The simulation and optimization techniques have been applied to different gas systems, based on reported permeability data through a given polymer. By simulating this process, some other unattainable interests with respect to conventional operations are highlighted besides the improved selectivity, as well as some important unavoidable drawbacks. The main outcome of this study is, for each gas pair, a characteristic chart where steady state and cyclic separation performances (namely selectivity and productivity) are compared. An example is shown on figure 1 for the He/Ar gas pair. It can be seen that the cyclic operation offers a very large increase of the process selectivity to be possibly attained, at the expense of a productivity decrease.

Constant flowrate filtration of hybridoma cells suspensions

J Chem Technol Biotechnol, 2007

The fouling mechanism of rotating sieves (also called spinfilters) in suspended mammalian cells r... more The fouling mechanism of rotating sieves (also called spinfilters) in suspended mammalian cells reactors is still poorly understood, and their design is consequently largely empirical. A laboratory set-up enabling constant flowrate filtration experiments is reported and its use described in order to study the fouling kinetics of 10 microns opening sieves by suspended hybridomas. Significant differences were obtained depending upon cell type and cell viability, under similar operating conditions. A roughly linear pressure drop increase, as predicted by constant flowrate incompressible cake filtration models, was obtained for most experiments. However, the influences of pumping flowrate and cell concentration on pressure drop evolution do not obey incompressible cake constant flowrate filtration laws; a surface colonization approach could possibly lead to a better description in that case.

Une manipulation d'extraction liquide-liquide pédagogique, propre et sûre

Bulletin De L Union Des Physiciens, 2008

Résumé/Abstract Une manipulation d&#39;extraction liquide-liquide en laboratoire reposant sur... more Résumé/Abstract Une manipulation d&#39;extraction liquide-liquide en laboratoire reposant sur l&#39;utilisation d&#39;un mélange biphasique ne faisant pas appel à des solvants organiques (seul composé volatil: eau) est décrite. Les notions de coefficient de partage d&#39;un soluté, d&#39; ...

Application des procédés d'aération sans bulles à l'épuration biologique des eaux résiduaires : État de la technique et applications potentielles

La Tribune De L Eau, 2003

CO� capture in flue gas: Semiempirical approach to select a potential physical solvent

Ind Eng Chem Res, 2006

Dispositif de traitement d'atmosphère intérieure, Enveloppe Soleau

Pioneers in membrane transport: Graham, von Wroblewski � and Lhermite

Journal of Membrane Science, Feb 1, 2004

Gas permeability of combined membrane systems with mobile liquid carrier

Colloid J Engl Tr, 2006

Gas transfer in a membrane system called a selective membrane valve (SMV) is studied. The SMV is ... more Gas transfer in a membrane system called a selective membrane valve (SMV) is studied. The SMV is a system consisting of two mobile gas phases, one mobile liquid phase, and two membranes acting as interfaces between gas and liquid. Such a membrane system has supplementary variable parameters and is designated for the separation of multicomponent gas mixtures. System permeability for individual gases (CO2, O2, and H2) and its dependence on a flow rate of a liquid phase are studied. Time dependences of the non-steady state transfer of CO2 through the immobile layer of chemisorbent (aqueous K2CO3 solution) at its different concentrations are studied for the first time. Two theoretical models are developed: the model of gas transfer through a selective membrane valve system with a mobile liquid absorbent (in the absence of chemical interaction) and the model of a non-steady-state transfer of CO2 through the immobile layer of aqueous potassium carbonate solution. The first model makes it possible to determine gas-to-liquid diffusion coefficients; the second model permits us to plot kinetic permeability curves and to calculate system permeability with allowance for the CO2 transfer accompanied by reversible chemical reaction with the carrier. The model dependences agree well with the experimental data.

Experimental study of hydrogen, carbon dioxide and nitrogen permeation through a microporous silica membrane : short communication

Chemical Engineering Journal, Dec 15, 2001

The transport of hydrogen, carbon dioxide and nitrogen through a microporous tubular silica membr... more The transport of hydrogen, carbon dioxide and nitrogen through a microporous tubular silica membrane has been investigated between 20 and 200 • C and 3-9 bar upstream pressure. Pure compounds permeabilities decrease from H 2 to N 2 and do not show a strong dependence upon upstream pressure. Temperature variation could be described by an Arrhenius law with low apparent activation energies (3.5, 3.7 and 3.4 kJ mol −1 , respectively, for hydrogen, carbon dioxide and nitrogen). The ideal separation selectivity computed from these results leads to values around 3.5 and 3 for H 2 /CO 2 and CO 2 /N 2 separation independent of temperature. These values are significantly smaller than those expected from a strict Knudsen mechanism (4.7 and 3.7, respectively). A viscous contribution, resulting for instance from a too large pore size distribution of the active silica layer, possibly accounts for the experimental results obtained.

Pushing the limits of intensified CO2 post-combustion capture by gas–liquid absorption through a membrane contactor

Chemical Engineering and Processing: Process Intensification, 2015

ABSTRACT The possibility to maximize the intensification (i.e., volume reduction) of post-combust... more ABSTRACT The possibility to maximize the intensification (i.e., volume reduction) of post-combustion carbon dioxide capture by chemical absorption in a monoethanolamine (MEA) solution using a membrane contactor module is reported. The influence of MEA concentration (20–90 wt%) and temperature (293–333 K) on the CO2 capture ratio achieved by a PTFE hollow fiber membrane contactor has been investigated with a CO2/N2 (15/85 vol%) gas mixture and the experimental results modeled. It is shown, through a systematic parametric analysis, that the intensification factor of the absorption unit, defined as the ratio of the CO2 volumetric absorption capacity of the membrane contactor and of the packed column (taken at 1 mol CO2 m−3 s−1), can be largely increased when a concentrated (70 wt%) MEA solution at 333 K is used. A volume reduction up to a factor 9, together with a lower energy penalty due to pressure drop effects (kWh per ton of captured CO2) is potentially obtained compared to packed column performances, when a large enough membrane mass transfer coefficient is achieved (i.e., larger than 10−4 m s−1). The remaining challenges which are required in order to develop this level of performances at industrial scale based on the existing membrane contactor materials are discussed.

CO2/N2 Reverse Selective Gas Separation Membranes : Technological Opportunities and Scientific Challenges

Industrial Engineering Chemistry Research, 2009

Procédé et installation de traitement sélectif des gaz dans un mélange gazeux

Procédé d'extraction liquide-liquide en colonne avec régénération PROCEDE EXTR'AQ®

Contrat de communication de savoir faire et licence d'utilisation exclusive du procédé d'... more Contrat de communication de savoir faire et licence d'utilisation exclusive du procédé d'extraction liquide-liquide en colonne avec régénération PROCEDE EXTR'AQ® (Dépôt INPI N° national 1030756295 en date du 26 Janvier 2010) pour une durée de 5 ans de entre INPL-ENSIC et la société Pignat SA (Référence contrat : #2010/3745, 18 Mai 2010)

Maximizing Mass Transfer Using Highly Curved Helical Pipes: A CFD Investigation

Proceedings of the 6th International Conference on Fluid Flow, Heat and Mass Transfer (FFHMT'19), Jun 1, 2019

Membrane contactors are considered as one of the most promising intensification technologies for ... more Membrane contactors are considered as one of the most promising intensification technologies for gas-liquid absorption processes in food, chemistry, energy and pharmaceutical industries. Two strategies can be applied in order to push process intensification: maximize mass transfer coefficients and maximize the specific membrane surface area (i.e. packing density) of the module. Dean vortices generation is one of the most efficient way for mass transfer improvement but requires helical shape membranes. Consequently, a combined packing geometry and mass transfer study is needed in order to evaluate the optimal performances of helical hollow fiber membrane modules. This work aimed to achieve that target through a systematic analysis of mass transfer performances in highly curved hollow membrane contactors. The impact of the nondimensional numbers * , * (respectively the helical radius and helical pitch both nondimensionalized by the pipe diameter) on mass transfer was evaluated numerically by using CFD. Helical hollow fiber membranes with lengths ranging from 30 to 6000 , nondimensional helical diameters * between 0.05 and 10, and nondimensional helical pitches * between 1.25 and 15 were studied. In addition, mass transfer in packed membrane modules is analyzed thanks to a mass transfer enhancement factor , which is equal to the mass transfer ratio ℎ ∞ / ℎ ∞ (comparing the Sherwood number of helical and straight pipes) multiplied by the packing density ratio / (comparing the packing density of helical and straight pipes). It is shown that enhancement is maximal for highly curved helical pipes. For example, for a Schmidt number of 10, highly curved pipes allow reaching a ℎ ∞ value, which is about 4 times larger than that of a straight tube. For a Schmidt number 1000, the mass transfer efficiency can be enhanced by one order of magnitude.

Membrane separations and energy efficiency

Journal of Membrane Science

Membrane processes are usually considered to offer very promising performances in terms of energy... more Membrane processes are usually considered to offer very promising performances in terms of energy efficiency for industrial separations. This statement particularly holds for homogeneous gas and liquid separations which are traditionally performed thanks to unit operations based on a phase change (distillation, evaporation, condensation, crystallization…). The energy efficiency concept can however be addressed through different methodologies, potentially leading to different, if not opposite conclusions. A critical analysis of the energy efficiency concept for membrane separations is proposed. Starting from the most usual minimum work of separation definition, alternative expressions of this key concept are developed in order to better reflect the different types of separation situations encountered for practical purposes (solute purification and/or recovery, process selectivity). In a second step, the real work of separation of a given process, classically evaluated through modern Process Systems Engineering computations, including thermodynamic modelling and irreversible processes computations, is discussed. The interest of the entropy dissipation function, obtained from Irreversible Processes Thermodynamics (IPT) approach is then presented. The methodology is applied to the separation of a perfect gas mixture (air) and non ideal (seawater) liquid mixture. The local entropy dissipation rate offers the opportunity to analyze the impact of fluid distribution in membrane modules, possibly leading to improved designs through the entropy equipartition theory. The largely unexplored possibilities of IPT to provide a predictive evaluation of the overall energy efficiency of a separation process, based on a diffusional mass transfer mechanism, is finally illustrated.

Status and progress of membrane contactors in post-combustion carbon capture: A state-of-the-art review of new developments

Journal of Membrane Science, 2016

Post-combustion carbon capture (PCC), which can be retrofitted to existing units in power plants ... more Post-combustion carbon capture (PCC), which can be retrofitted to existing units in power plants worldwide, is regarded as the first technologically feasible and effective way to combat human-induced climate change. The membrane contactor is an emerging and promising membrane technology for PCC as it integrates the benefits of both liquid absorption (high selectivity) and membrane separation (modularity and compactness). This review aims to provide a state-of-the-art assessment of the research work carried out so far on membrane contactor technology in PCC. It details common aspects of membrane contactors, such as technological advantages, membrane wetting, mass transfer and module design, as well as new advances (e.g., new membranes and absorbents used in absorption processes) and novel applications (e.g., direct CO 2 stripping and integrated heat recovery in desorption processes). Moreover, the difference in performance between membrane absorption and conventional absorption is also compared and discussed. Lastly, we discuss the status and progress of membrane contactors in PCC and offer some recommendations for future work. This paper provides a clear overview on the recent developments of membrane contactor technology in PCC.

Adiabatic modelling of CO2 capture by amine solvents using membrane contactors

Journal of Membrane Science, 2015

ABSTRACT

Specialty Grand Challenges in Separation Processes

Frontiers in Chemical Engineering

Stripping of CO 2 in Post-combustion Capture with Chemical Solvents: Intensification Potential of Hollow Fiber Membrane Contactors

Energy Procedia

Post-combustion CO2 capture (PCC) is an important strategy in mitigating greenhouse effect. The r... more Post-combustion CO2 capture (PCC) is an important strategy in mitigating greenhouse effect. The robustness of packed columns makes it the standard technology for the gas-liquid absorption of CO2, using aqueous amine solutions as liquid absorbents. Even though it is not the best performing chemical solvent, monoethanolamine (MEA) at 30% wt. is currently considered as the benchmark solvent for PCC [1]. However, the treatment of large quantities of flue gases requires itself equipment of a large size. Hollow fibre membrane contactors (HFMC) are considered as one of the most promising strategies for intensified CO2 absorption process, due to their significantly higher interfacial area than that of packed columns, allowing to reduce the equipment size [2].

Data supporting the validation of a simulation model for multi-component gas separation in polymeric membranes

Data in Brief, 2016

The article describes data concerning the separation performances of polymeric hollow-fiber membr... more The article describes data concerning the separation performances of polymeric hollow-fiber membranes. The data were obtained using a model for simulating gas separation, described in the research article entitled "Interplay of inlet temperature and humidity on energy penalty for CO 2 postcombustion capture: rigorous analysis and simulation of a single stage gas permeation process" (L. Giordano, D. Roizard, R. Bounaceur, E. Favre, 2016) [1]. The data were used to validate the model by comparison with literature results. Considering a membrane system based on feed compression only, data from the model proposed and that from literature were compared with respect to the molar composition of permeate stream, the membrane area and specific energy requirement, varying the feed pressure and the CO 2 separation degree.

Cyclic Membrane Gas Separation Processes Assessment

ABSTRACT The analysis of membrane gas separation processes under transient conditions for practic... more ABSTRACT The analysis of membrane gas separation processes under transient conditions for practical applications is a rather unexplored domain. One of the main advantages of membrane processes compared to other separations is their ability to work under steady conditions, without any separate regeneration step. Nevertheless, unique separation performances can be obtained in some cases when a transient regime is applied. Paul explored this issue in a pioneering study, based on a cyclic process with synchronous valve operation. Followed by this initial work, more theoretical and experimental studies about the cyclic process have been performed. Some interests and also some drawbacks have been defined qualitatively. A general improved selectivity is highlighted with respect to a conventional process, together with a significant decrease on productivity. Thus, the trade-off between these two factors is the key issue to assess whether the cyclic process is competitive with respect to a conventional process. Based on Paul&#39;s process, a cyclic process for membrane gas separations is proposed in our study with more available operating possibilities and less modeling assumptions. The simulation and optimization techniques have been applied to different gas systems, based on reported permeability data through a given polymer. By simulating this process, some other unattainable interests with respect to conventional operations are highlighted besides the improved selectivity, as well as some important unavoidable drawbacks. The main outcome of this study is, for each gas pair, a characteristic chart where steady state and cyclic separation performances (namely selectivity and productivity) are compared. An example is shown on figure 1 for the He/Ar gas pair. It can be seen that the cyclic operation offers a very large increase of the process selectivity to be possibly attained, at the expense of a productivity decrease.

Constant flowrate filtration of hybridoma cells suspensions

J Chem Technol Biotechnol, 2007

The fouling mechanism of rotating sieves (also called spinfilters) in suspended mammalian cells r... more The fouling mechanism of rotating sieves (also called spinfilters) in suspended mammalian cells reactors is still poorly understood, and their design is consequently largely empirical. A laboratory set-up enabling constant flowrate filtration experiments is reported and its use described in order to study the fouling kinetics of 10 microns opening sieves by suspended hybridomas. Significant differences were obtained depending upon cell type and cell viability, under similar operating conditions. A roughly linear pressure drop increase, as predicted by constant flowrate incompressible cake filtration models, was obtained for most experiments. However, the influences of pumping flowrate and cell concentration on pressure drop evolution do not obey incompressible cake constant flowrate filtration laws; a surface colonization approach could possibly lead to a better description in that case.

Une manipulation d'extraction liquide-liquide pédagogique, propre et sûre

Bulletin De L Union Des Physiciens, 2008

Résumé/Abstract Une manipulation d&#39;extraction liquide-liquide en laboratoire reposant sur... more Résumé/Abstract Une manipulation d&#39;extraction liquide-liquide en laboratoire reposant sur l&#39;utilisation d&#39;un mélange biphasique ne faisant pas appel à des solvants organiques (seul composé volatil: eau) est décrite. Les notions de coefficient de partage d&#39;un soluté, d&#39; ...

Application des procédés d'aération sans bulles à l'épuration biologique des eaux résiduaires : État de la technique et applications potentielles

La Tribune De L Eau, 2003

CO� capture in flue gas: Semiempirical approach to select a potential physical solvent

Ind Eng Chem Res, 2006

Dispositif de traitement d'atmosphère intérieure, Enveloppe Soleau

Pioneers in membrane transport: Graham, von Wroblewski � and Lhermite

Journal of Membrane Science, Feb 1, 2004

Gas permeability of combined membrane systems with mobile liquid carrier

Colloid J Engl Tr, 2006

Gas transfer in a membrane system called a selective membrane valve (SMV) is studied. The SMV is ... more Gas transfer in a membrane system called a selective membrane valve (SMV) is studied. The SMV is a system consisting of two mobile gas phases, one mobile liquid phase, and two membranes acting as interfaces between gas and liquid. Such a membrane system has supplementary variable parameters and is designated for the separation of multicomponent gas mixtures. System permeability for individual gases (CO2, O2, and H2) and its dependence on a flow rate of a liquid phase are studied. Time dependences of the non-steady state transfer of CO2 through the immobile layer of chemisorbent (aqueous K2CO3 solution) at its different concentrations are studied for the first time. Two theoretical models are developed: the model of gas transfer through a selective membrane valve system with a mobile liquid absorbent (in the absence of chemical interaction) and the model of a non-steady-state transfer of CO2 through the immobile layer of aqueous potassium carbonate solution. The first model makes it possible to determine gas-to-liquid diffusion coefficients; the second model permits us to plot kinetic permeability curves and to calculate system permeability with allowance for the CO2 transfer accompanied by reversible chemical reaction with the carrier. The model dependences agree well with the experimental data.

Experimental study of hydrogen, carbon dioxide and nitrogen permeation through a microporous silica membrane : short communication

Chemical Engineering Journal, Dec 15, 2001

The transport of hydrogen, carbon dioxide and nitrogen through a microporous tubular silica membr... more The transport of hydrogen, carbon dioxide and nitrogen through a microporous tubular silica membrane has been investigated between 20 and 200 • C and 3-9 bar upstream pressure. Pure compounds permeabilities decrease from H 2 to N 2 and do not show a strong dependence upon upstream pressure. Temperature variation could be described by an Arrhenius law with low apparent activation energies (3.5, 3.7 and 3.4 kJ mol −1 , respectively, for hydrogen, carbon dioxide and nitrogen). The ideal separation selectivity computed from these results leads to values around 3.5 and 3 for H 2 /CO 2 and CO 2 /N 2 separation independent of temperature. These values are significantly smaller than those expected from a strict Knudsen mechanism (4.7 and 3.7, respectively). A viscous contribution, resulting for instance from a too large pore size distribution of the active silica layer, possibly accounts for the experimental results obtained.

Pushing the limits of intensified CO2 post-combustion capture by gas–liquid absorption through a membrane contactor

Chemical Engineering and Processing: Process Intensification, 2015

ABSTRACT The possibility to maximize the intensification (i.e., volume reduction) of post-combust... more ABSTRACT The possibility to maximize the intensification (i.e., volume reduction) of post-combustion carbon dioxide capture by chemical absorption in a monoethanolamine (MEA) solution using a membrane contactor module is reported. The influence of MEA concentration (20–90 wt%) and temperature (293–333 K) on the CO2 capture ratio achieved by a PTFE hollow fiber membrane contactor has been investigated with a CO2/N2 (15/85 vol%) gas mixture and the experimental results modeled. It is shown, through a systematic parametric analysis, that the intensification factor of the absorption unit, defined as the ratio of the CO2 volumetric absorption capacity of the membrane contactor and of the packed column (taken at 1 mol CO2 m−3 s−1), can be largely increased when a concentrated (70 wt%) MEA solution at 333 K is used. A volume reduction up to a factor 9, together with a lower energy penalty due to pressure drop effects (kWh per ton of captured CO2) is potentially obtained compared to packed column performances, when a large enough membrane mass transfer coefficient is achieved (i.e., larger than 10−4 m s−1). The remaining challenges which are required in order to develop this level of performances at industrial scale based on the existing membrane contactor materials are discussed.

CO2/N2 Reverse Selective Gas Separation Membranes : Technological Opportunities and Scientific Challenges

Industrial Engineering Chemistry Research, 2009

Procédé et installation de traitement sélectif des gaz dans un mélange gazeux

Procédé d'extraction liquide-liquide en colonne avec régénération PROCEDE EXTR'AQ®

Contrat de communication de savoir faire et licence d'utilisation exclusive du procédé d'... more Contrat de communication de savoir faire et licence d'utilisation exclusive du procédé d'extraction liquide-liquide en colonne avec régénération PROCEDE EXTR'AQ® (Dépôt INPI N° national 1030756295 en date du 26 Janvier 2010) pour une durée de 5 ans de entre INPL-ENSIC et la société Pignat SA (Référence contrat : #2010/3745, 18 Mai 2010)