Simultaneous measurement of gas hold-up and mass transfer coefficient by tracer dynamic technique in "emulsair" reactor with an emulsion-venturi distributor
Identifieur interne : 001448 ( Main/Exploration ); précédent : 001447; suivant : 001449Simultaneous measurement of gas hold-up and mass transfer coefficient by tracer dynamic technique in "emulsair" reactor with an emulsion-venturi distributor
Auteurs : B. Gourich [Maroc] ; M. Belhaj Soulami [Maroc] ; A. Zoulalian [France] ; M. Ziyad [Maroc]Source :
- Chemical engineering science [ 0009-2509 ] ; 2005.
Descripteurs français
- Pascal (Inist)
- Mesure simultanée, Retenue gaz, Hydrodynamique, Coefficient transfert masse, Transfert masse, Traceur, Réacteur, Emulsion, Venturi, Ecoulement cocourant, Ecoulement descendant, Energie cinétique, Recirculation, Carbone dioxyde, Coefficient transfert matière volumétrique, Expansion volume, Régime écoulement, Barbotage, Corrélation, Analyse corrélation, Méthode dynamique, Débit fluide.
English descriptors
- KwdEn :
- Bubbling, Carbon dioxide, Cocurrent flow, Correlation, Correlation analysis, Downward flow, Dynamic method, Emulsion, Flow regime, Gas holdup, Hydrodynamics, Kinetic energy, Mass transfer, Mass transfer coefficient, Reactor, Recirculation, Simultaneous measurement, Tracers, Venturi, Volume expansion, Volumetric mass transfer coefficient.
Abstract
Hydrodynamics and gas-liquid mass transfer have been investigated in an "Emulsair" reactor with cocurrent downflow of gas and liquid. This consists of a cylindrical tank with conical bottom topped by an emulsion-venturi as the gas-liquid distributor in which the gas is self-aspired by action of the kinetic energy of the liquid recirculation. An original tracer dynamic technique using the CO2-N2/water system that enables the simultaneous measurement of overall gas hold-up and overall volumetric mass transfer coefficient has been developed and validated using conventional techniques, such as volume expansion for gas hold-up and dynamic oxygenation for mass transfer. It has been shown that gas hold-up and KLaL can be deduced from the moments of experimental response curves using a CO2 pulse in the gas feed. Experimental results have proved that hydrodynamics and mass transfer in the Emulsair reactor are strongly influenced by the flow regime in the divergent. Two different regimes have been observed depending on the liquid recirculation flow rate: annular and homogeneous bubbling flows. In both regimes, self-aspired gas flow rate, gas hold-up and KLaL have been reported to increase with the liquid flow rate. The operation effectiveness, estimated from the gas-to-liquid flow rate ratio, has been shown to pass through a maximum around 0.59 as a function of liquid recirculation. A comparison with the literature proved that this maximum is higher than those observed for other kinds of gas-liquid reactors equipped with a venturi. Correlations for mass transfer estimation have been derived and are in agreement with the literature.
Affiliations:
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Gourich</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Génie des Procédés, Ecole Supérieure de Technologie de Casablanca, B.P. 8012</s1><s2>Oasis Casablanca</s2><s3>MAR</s3><sZ>1 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Oasis Casablanca</wicri:noRegion></affiliation><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Département de Chimie, Faculté des sciences, Université Mohammed V, Avenue Ibn Battouta, B.P. 1014</s1><s2>Rabat</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Maroc</country><placeName><settlement type="city">Rabat</settlement><region nuts="2">Rabat-Salé-Kénitra</region></placeName></affiliation></author><author><name sortKey="Belhaj Soulami, M" sort="Belhaj Soulami, M" uniqKey="Belhaj Soulami M" first="M." last="Belhaj Soulami">M. Belhaj Soulami</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Laboratoire d'Ingénierie des Procédés et Environnement, (LIPE), ENIM, B.P. 753</s1><s2>Agdal Rabat</s2><s3>MAR</s3><sZ>2 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Agdal Rabat</wicri:noRegion></affiliation></author><author><name sortKey="Zoulalian, A" sort="Zoulalian, A" uniqKey="Zoulalian A" first="A." last="Zoulalian">A. Zoulalian</name><affiliation wicri:level="3"><inist:fA14 i1="04"><s1>Laboratoire de Génie des Procédés, ESSTIB, Université de Nancy 1, B.P. 239</s1><s2>54506 Vandoeuvre</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Grand Est</region><region type="old region" nuts="2">Lorraine (région)</region><settlement type="city">Vandoeuvre</settlement></placeName></affiliation></author><author><name sortKey="Ziyad, M" sort="Ziyad, M" uniqKey="Ziyad M" first="M." last="Ziyad">M. Ziyad</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Département de Chimie, Faculté des sciences, Université Mohammed V, Avenue Ibn Battouta, B.P. 1014</s1><s2>Rabat</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Maroc</country><placeName><settlement type="city">Rabat</settlement><region nuts="2">Rabat-Salé-Kénitra</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Chemical engineering science</title><title level="j" type="abbreviated">Chem. eng. sci.</title><idno type="ISSN">0009-2509</idno><imprint><date when="2005">2005</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Chemical engineering science</title><title level="j" type="abbreviated">Chem. eng. sci.</title><idno type="ISSN">0009-2509</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bubbling</term><term>Carbon dioxide</term><term>Cocurrent flow</term><term>Correlation</term><term>Correlation analysis</term><term>Downward flow</term><term>Dynamic method</term><term>Emulsion</term><term>Flow regime</term><term>Gas holdup</term><term>Hydrodynamics</term><term>Kinetic energy</term><term>Mass transfer</term><term>Mass transfer coefficient</term><term>Reactor</term><term>Recirculation</term><term>Simultaneous measurement</term><term>Tracers</term><term>Venturi</term><term>Volume expansion</term><term>Volumetric mass transfer coefficient</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Mesure simultanée</term><term>Retenue gaz</term><term>Hydrodynamique</term><term>Coefficient transfert masse</term><term>Transfert masse</term><term>Traceur</term><term>Réacteur</term><term>Emulsion</term><term>Venturi</term><term>Ecoulement cocourant</term><term>Ecoulement descendant</term><term>Energie cinétique</term><term>Recirculation</term><term>Carbone dioxyde</term><term>Coefficient transfert matière volumétrique</term><term>Expansion volume</term><term>Régime écoulement</term><term>Barbotage</term><term>Corrélation</term><term>Analyse corrélation</term><term>Méthode dynamique</term><term>Débit fluide</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Hydrodynamics and gas-liquid mass transfer have been investigated in an "Emulsair" reactor with cocurrent downflow of gas and liquid. This consists of a cylindrical tank with conical bottom topped by an emulsion-venturi as the gas-liquid distributor in which the gas is self-aspired by action of the kinetic energy of the liquid recirculation. An original tracer dynamic technique using the CO<sub>2</sub>-N<sub>2</sub>/water system that enables the simultaneous measurement of overall gas hold-up and overall volumetric mass transfer coefficient has been developed and validated using conventional techniques, such as volume expansion for gas hold-up and dynamic oxygenation for mass transfer. It has been shown that gas hold-up and K<sub>L</sub>a<sub>L</sub> can be deduced from the moments of experimental response curves using a CO<sub>2</sub> pulse in the gas feed. Experimental results have proved that hydrodynamics and mass transfer in the Emulsair reactor are strongly influenced by the flow regime in the divergent. Two different regimes have been observed depending on the liquid recirculation flow rate: annular and homogeneous bubbling flows. In both regimes, self-aspired gas flow rate, gas hold-up and K<sub>L</sub>a<sub>L</sub> have been reported to increase with the liquid flow rate. The operation effectiveness, estimated from the gas-to-liquid flow rate ratio, has been shown to pass through a maximum around 0.59 as a function of liquid recirculation. A comparison with the literature proved that this maximum is higher than those observed for other kinds of gas-liquid reactors equipped with a venturi. Correlations for mass transfer estimation have been derived and are in agreement with the literature.</div></front></TEI><affiliations><list><country><li>France</li><li>Maroc</li></country><region><li>Grand Est</li><li>Lorraine (région)</li><li>Rabat-Salé-Kénitra</li></region><settlement><li>Rabat</li><li>Vandoeuvre</li></settlement></list><tree><country name="Maroc"><noRegion><name sortKey="Gourich, B" sort="Gourich, B" uniqKey="Gourich B" first="B." last="Gourich">B. Gourich</name></noRegion><name sortKey="Belhaj Soulami, M" sort="Belhaj Soulami, M" uniqKey="Belhaj Soulami M" first="M." last="Belhaj Soulami">M. Belhaj Soulami</name><name sortKey="Gourich, B" sort="Gourich, B" uniqKey="Gourich B" first="B." last="Gourich">B. Gourich</name><name sortKey="Ziyad, M" sort="Ziyad, M" uniqKey="Ziyad M" first="M." last="Ziyad">M. Ziyad</name></country><country name="France"><region name="Grand Est"><name sortKey="Zoulalian, A" sort="Zoulalian, A" uniqKey="Zoulalian A" first="A." last="Zoulalian">A. Zoulalian</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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