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Etude Des Transferts Interfaciaux En Extraction Liquide Liquide Sous Champ Electrique
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Book Synopsis Etude des transferts interfaciaux en extraction liquide-liquide sous champ électrique by : Muriel Hund-Huart
Download or read book Etude des transferts interfaciaux en extraction liquide-liquide sous champ électrique written by Muriel Hund-Huart and published by . This book was released on 1988 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'étude expérimentale du transfert de matière est réalisée pour 3 systèmes ternaires mettant en jeu principalement des molécules plutôt que des ions. Deux phénomènes sont observés: un effet électrostatique (orientation des molécules) et un effet électrodynamique (modification de la tension interfaciale). Un contacteur à électrode externe, soumis à des oscillations forcées est utilisé pour l'extraction de l'acide acétique. Lorsque la fréquence des oscillations est égale à la fréquence de résonance naturelle des gouttes on observe une diminution de la vitesse de chute et une augmentation du coefficient de transfert. La taille des gouttes a aussi une influence.
Book Synopsis Etude des effets du champ électrique sur les transferts interfaciaux et dans une colonne d'extraction liquide-liquide by : Christine Fombarlet
Download or read book Etude des effets du champ électrique sur les transferts interfaciaux et dans une colonne d'extraction liquide-liquide written by Christine Fombarlet and published by . This book was released on 1984 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'application d'un champ électrique en extraction liquide-liquide, permet d'améliorer les coefficients de transfert et de jouer sur les aires interfaciales par des effets de dispersion et de coalescence. La possibilité d'appliquer un champ à un milieu liquide-liquide, dépend des propriétés de ce milieu. Une méthode de mesure de la permittivité et de la conductivité est mise au point et appliquée aux milieux diphasiques semblables à ceux traités dans les colonnes d'extraction liquide-liquide. un nouveau type de cellule à l'interface plane permet l'étude du transfert sous champ électrique pour les systèmes de l'hydrométallurgie. L'influence favorable du champ est attribuée à un phénomène d'orientation des molécules. Une colonne à plateaux électrifiés, mettant en jeu des phénomènes de coalescence et de dispersion est réalisée et testée. Avec la meilleure géométrie d'électrodes, elle permet de multiplier l'efficacité par quatre. Une petite installation pilote capable de traiter des débits beaucoup plus importants, est réalisée et permet d'approfondir l'étude hydrodynamique sous champ électrique.
Book Synopsis Extraction liquide-liquide sous champ électrique. Contacteur à électrodes externes by : Dominique Sciolla
Download or read book Extraction liquide-liquide sous champ électrique. Contacteur à électrodes externes written by Dominique Sciolla and published by . This book was released on 1987 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mise en place d'un contacteur muni d'électrodes isolées des fluides par un revêtement diélectrique et alimente par un générateur haute tension de fréquence ajustable. L'étude expérimentale porte principalement sur l'hydrodynamique (rétention et dispersion électrostatique, distribution de temps de séjour...), le comportement électrique du contacteur et le transfert de matière.
Book Synopsis Comparaison de différentes méthodes d'investigation sur les cinétiques de transfert en extraction liquide-liquide by : Sandrine Colombani
Download or read book Comparaison de différentes méthodes d'investigation sur les cinétiques de transfert en extraction liquide-liquide written by Sandrine Colombani and published by . This book was released on 2000 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: En extraction liquide-liquide, les études cinétiques font appel à de nombreuses techniques, dont le choix semble plus conjoncturel que scientifique. Par ailleurs, la comparaison des résultats publiés concernant un même système chimique et différentes techniques est complexe. Les objectifs de ce travail sont une meilleure compréhension des phénomènes de transfert et la proposition d’une méthodologie pour les étudier. L’extraction du fer (III) en milieu chlorhydrique par le TBP est étudiée avec trois dispositifs choisi à l’issue d’une bibliographie critique : une cellule à aire interfaciale constante de type ARMOLLEX, un dispositif de colonnes à goutte unique et une cellule homothétique fortement agitée. L’étude thermodynamique de l’extraction a montré que le complexe extrait est HFeCl4(TBP)55h2O)n. Un mécanisme original est proposé et validé pour expliquer cette stœchiométrie inhabituelle. Une étude comparative de l’influence des paramètres hydrodynamiques sur la cinétique d’extraction permet de déterminer l’existence d’un régime mixte en cellule ARMOLLEX (coexistence d’une résistance diffusionnelle en phase organique et d’une résistance interfaciale chimique) et d’un régime chimique en goutte unique. Les études effectuées montrent que le système Fe(III)-HCI/TBP-dodécane est réversible thermodynamiquement et cinétiquement. Les mécanismes réactionnels proposés ont pour étape limitante la formation du complexe interfacial HFeCl4(TBP)2. Un essai en cellule homothétique fortement agitée montre que ce système est trop rapide pour être étudié à l’aide de cette technique. L’apparente indépendance de la cinétique de transfert par rapport aux paramètres hydrodynamiques, souvent associée à l’atteinte du régime chimique en cellule à aire interfaciale constante, est remise en question. La nécessité de confirmer la nature du régime de transfert par une autre technique telle que la goutte unique est démontrée. Une méthodologie des études cinétiques est proposée.
Book Synopsis Contribution à l'étude des cinétiques d'extraction liquide-liquide dans le cas de transferts rapides by : Claude Jaouen
Download or read book Contribution à l'étude des cinétiques d'extraction liquide-liquide dans le cas de transferts rapides written by Claude Jaouen and published by . This book was released on 1979 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modelling in Aquatic Chemistry by : OECD Nuclear Energy Agency
Download or read book Modelling in Aquatic Chemistry written by OECD Nuclear Energy Agency and published by Nuclear Energy Agency. This book was released on 1997 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Practical Sonochemistry by : Timothy J Mason
Download or read book Practical Sonochemistry written by Timothy J Mason and published by Woodhead Publishing. This book was released on 2002-11-01 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: This updated version of Practical Sonochemistry for advanced students and teachers in chemistry and chemical engineering conveys the increasing growth in applications and equipment to power ultrasound. Equipment now on the market offers a wider range of frequencies with more reproducible experimentation and a variety of scale-up systems. The book provides detailed descriptions of newer ultrasonic equipment and its applications, and practical laboratory uses of ultrasound technology for industrial scale performance.Modern exercises familiarise readers with recent sonochemical operations. The book also includes methods for estimating ultrasonic energy entering the system (dosimetry), which will standardise sonochemical methodology and enable practitioners to reproduce results from other laboratories. Conveys the increasing growth in applications and equipment to power ultrasound Provides detailed descriptions of new ultrasonic equipment and its applications and practical laboratory uses of ultrasound technology for industrial scale performance Includes methods for estimating ultrasonic energy entering the system (dosimetry), which will standardise sonochemical methodology and enable practitioners to reproduce results from other laboratories
Book Synopsis Basic Concepts for Simple and Complex Liquids by : Jean-Louis Barrat
Download or read book Basic Concepts for Simple and Complex Liquids written by Jean-Louis Barrat and published by Cambridge University Press. This book was released on 2003-03-27 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presenting a unified approach, this book focusses on the concepts and theoretical methods that are necessary for an understanding of the physics and chemistry of the fluid state. The authors do not attempt to cover the whole field in an encyclopedic manner. Instead, important ideas are presented in a concise and rigorous style, and illustrated with examples from both simple molecular liquids and more complex soft condensed matter systems such as polymers, colloids, and liquid crystals.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Book Synopsis Artificial Intelligence in Society by : OECD
Download or read book Artificial Intelligence in Society written by OECD and published by OECD Publishing. This book was released on 2019-06-11 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The artificial intelligence (AI) landscape has evolved significantly from 1950 when Alan Turing first posed the question of whether machines can think. Today, AI is transforming societies and economies. It promises to generate productivity gains, improve well-being and help address global challenges, such as climate change, resource scarcity and health crises.
Book Synopsis On the Continuity of the Gaseous and Liquid States by : J. D. Van Der Waals
Download or read book On the Continuity of the Gaseous and Liquid States written by J. D. Van Der Waals and published by Courier Corporation. This book was released on 2004-01-01 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This much-cited thesis by J. D. van der Waals, the recipient of the 1910 Nobel Prize in physics, is accompanied by an introductory essay by J. S. Rowlinson and another work by van der Waals on the theory of liquid mixtures. 1988 edition.
Book Synopsis Adhesion between polymers and concrete / Adhésion entre polymères et béton by : H. R. Sasse
Download or read book Adhesion between polymers and concrete / Adhésion entre polymères et béton written by H. R. Sasse and published by Springer. This book was released on 2013-11-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preface Adhesion is a phenomenon architects and civil engineers are not very familiar with. In other disciplines knowledge about surface properties and the background of bonding energies is also far from satisfactory; nevertheless there are many important· applications in concrete engineering, where adhesion is necessary for success and durability. These include: - coating and painting - repair of concrete surfaces - bonding of fresh to old concrete - crack injection - glueing of precast elements - glueing of steel to concrete, etc. In 1981 RILEM established the technical committee 52-RAC 'Resin Adherence to Concrete'. The main aims of the committee's work were - to collect research results and practical experiences - to initiate and coordinate research programs - to develop, on a scientific base, test methods for field and for laboratory purposes. One of the results of the committee's work is a state-of-the-art report, which will be presented orally as a General Report at the International Symposium ISAP '86, and will be printed either in the RILEM journal Materials and Structures or separately. Several test recommendations have been elaborated and will be prepared as drafts for the participants ofISAP '86. These are: - direct tensile test - pull-off test - direct shear test - slant shear test - four-point bending test - dynamic loading test - thermal compatibility test (two versions) - injectibility test.
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development Publisher : ISBN 13 :9789283600046 Total Pages : pages Book Rating :4.6/5 ( download)
Book Synopsis AGARD Conference Proceedings by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Download or read book AGARD Conference Proceedings written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Managing California's Snow Zone Lands for Water by : Henry Walter Anderson
Download or read book Managing California's Snow Zone Lands for Water written by Henry Walter Anderson and published by . This book was released on 1963 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Chemical Thermodynamics of Neptunium and Plutonium by : Robert J. Lemire
Download or read book Chemical Thermodynamics of Neptunium and Plutonium written by Robert J. Lemire and published by Elsevier. This book was released on 2001-08-26 with total page 876 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unlike earlier books in this series, this review describes the selection of chemical thermodynamic data for species of two elements, neptunium and plutonium. Although this came about more by circumstance than design, it has allowed for a more consistent approach to chemical interpretation than might have occurred in two separate treatments. It has also drawn attention to cases where the available data do not show expected parallels, and where further work may be useful to confirm or refute apparent differences in the behaviour of neptunium and plutonium.
Book Synopsis Unsteady State Processes in Catalysis by : Yu S. Matros
Download or read book Unsteady State Processes in Catalysis written by Yu S. Matros and published by VSP. This book was released on 1990-12 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last decades the investigation methods of unsteady state catalytic processes have been widely developed by the response-technique methods. From this research emerged the realization that under unsteady state conditions and, especially under artificially created ones, it is possible to increase the productivity or selectivity of a catalyst or a catalytical process as a whole. The scientific literature in this field is mostly theoretical and aims at structuring and analysing mathematical models of unsteady state catalytical processes. In this book the theoretical and applied aspects of an efficiency of artificially created unsteady conditions in catalysis are discussed. It contains the lectures from researchers from all over the world that were held during the International Conference ''Unsteady State Processes in Catalysis'', 5--8 June 1990, Novosibirsk (USSR). Topics include: -- The problems of dynamics of a catalyst surface -- Kinetic models of unsteady processes -- Dynamics of chemical reactors -- Artificially created unsteady processes in a catalytic reactor.
Book Synopsis Government at a Glance Southeast Asia 2019 by : OECD
Download or read book Government at a Glance Southeast Asia 2019 written by OECD and published by OECD Publishing. This book was released on 2019-09-10 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Government at a Glance Southeast Asia 2019 is the first edition in the Government at a Glance series for the region. It provides the latest available data on public administrations in the 10 ASEAN member countries: Brunei Darussalam, Cambodia, Indonesia, Lao People’s Democratic Republic, Malaysia, Myanmar, the Philippines, Singapore, Thailand and Viet Nam.
