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Comparaison De Differentes Methodes Dinvestigation Sur Les Cinetiques De Transfert En Extraction Liquide Liquide
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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 Etude des phénomènes de transfert de matière et d'énergie lors d'un procédé d'extraction liquide-liquide dans une colonne pulsée by : Papken Sarkis
Download or read book Etude des phénomènes de transfert de matière et d'énergie lors d'un procédé d'extraction liquide-liquide dans une colonne pulsée written by Papken Sarkis and published by . This book was released on 2012 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette étude porte sur la conception d’une nouvelle technologie de colonne d’extraction appliquée au contact liquide-liquide. Cette conception associe le mécanisme de transfert d’énergie pour la fragmentation de la phase légère en gouttelettes et de transfert de matière phase dispersée - phase lourde circulant à contre-courant. Ce mécanisme présente de façon récurrente sur chaque plateau, une coalescence des gouttes suivie d’une fragmentation. Dans une colonne pulsée, la rupture des gouttes (formation de l’émulsion) est favorisée par les perforations des plateaux, sous l’effet de la pulsation de l’ensemble du volume liquide, les plateaux perforés immobiles créent des turbulences et un transfert d’énergie au sein de l’écoulement avec fragmentation des gouttes. Dans une colonne Kühni, le transfert d’énergie se fait à l’aide de turbines à pales droites distribuées de façon régulière sur l’arbre axial séparée par des anneaux fixes. Le but de ce travail consiste à suivre par analyse d’images le transfert de matière et d’énergie de l’acide acétique dans le cadre d’un procédé d’extraction liquide-liquide en utilisant deux types de mélanges, un mélange couramment utilisé (phase aqueuse / phase organique ) et un mélange diphasique aqueux afin de prendre en compte les contraintes environnementales. Ces études ont été effectuées dans une colonne pulsée et les résultats ont été comparés avec ceux obtenus dans une colonne Kühni. Pour cela, nous avons instrumenté les deux colonnes à l’aide d’une caméra numérique à forte résolution (1 μm) et à grande vitesse d’acquisition (1 image tous les 20 millisecondes) afin de qualifier la dispersion spatiale de la phase légère le long de la colonne. L’utilisation du logiciel Visilog 6.7 nous a permis de connaître la distribution statistique des diamètres de l’émulsion, le rapport surface/volume (S/V) et le volume des gouttes (DSD) en fonction des paramètres de fonctionnement (vitesse du rotor, vitesse de pulsation et teneur initiale en acide acétique). Nous avons montré que la distribution en taille des gouttes permet de qualifier les phénomènes de transfert de matière et d’énergie au sein des différentes colonnes. Ces résultats permettent d’accéder à la notion d’efficacité du transfert de matière en termes de transfert d’énergie (agitation) et de matière (diffusion- convection) et qualifient le hold-up et sa limite de fonctionnement caractérisée par l’engorgement (transfert d’énergie sans coalescence de l’émulsion). Les valeurs expérimentales du diamètre moyen de Sauter (d32) sont en bon accord avec celles proposées par les corrélations de Kumar et Hartland.
Book Synopsis Advances in Solid State Fermentation by : S. Roussos
Download or read book Advances in Solid State Fermentation written by S. Roussos and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 641 pages. Available in PDF, EPUB and Kindle. Book excerpt: G.HAINNAUX Departement Milieu et Activites Agricoles, Centre ORSTOM, 911 Avenue d' Agropolis, B.P. 5045, 34032 Montpellier Cedex , France. Solid state fermentation, popularly abbreviated as SSF, is currently investigated by many groups throughout the world. The study of this technique was largely neglected in the past in European and Western countries and there is now a high demand for SSF, meaning in food, environment, agricultural, phannaceutical and many other biotechnological applications. It gives me satisfaction to note that the importance of this technique was realised at my department way back in 1975 since then, our team has put concentrated efforts on developing this technique. xvii Foreword Advances in Solid State Fermentation Foreword M. PUYGRENIER Agropolis Valorisation, Avenue d' Agropolis, 34394 Montpellier Cedex 5, France. On the name of the Scientific Community, I would like to express the wish that this International Symposium on SSF should be successful. Solid State Fermentation is part of biotechnology research. It consists on seeding solid culture medium with bacteria or fungi (filamentous or higher) and on producing, in this medium (solid components and exudates) metabolites and high value products. In fact, this process is very old. In older industries such the food and agricultural, this technique has been extensively used. An example of this is the production of pork sausages and Roquefort cheese. Pharmaceutical industry could make extensive use of SSF in the production of secondary metabolites of many kinds and development in this direction is soon expected.
Book Synopsis New Trends in Fluorescence Spectroscopy by : Bernard Valeur
Download or read book New Trends in Fluorescence Spectroscopy written by Bernard Valeur and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first volume in the new Springer Series on Fluorescence brings together fundamental and applied research from this highly interdisciplinary and field, ranging from chemistry and physics to biology and medicine. Special attention is given to supramolecular systems, sensor applications, confocal microscopy and protein-protein interactions. This carefully edited collection of articles is an invaluable tool for practitioners and novices.
Download or read book Exchange Reactions written by and published by . This book was released on 1965 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Book Synopsis Microstructured Devices for Chemical Processing by : Madhvanand N. Kashid
Download or read book Microstructured Devices for Chemical Processing written by Madhvanand N. Kashid and published by John Wiley & Sons. This book was released on 2014-12-22 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: Faster, cheaper and environmentally friendly, these are the criteria for designing new reactions and this is the challenge faced by many chemical engineers today. Based on courses thaught by the authors, this advanced textbook discusses opportunities for carrying out reactions on an industrial level in a technically controllable, sustainable, costeffective and safe manner. Adopting a practical approach, it describes how miniaturized devices (mixers, reactors, heat exchangers, and separators) are used successfully for process intensification, focusing on the engineering aspects of microstrctured devices, such as their design and main chracteristics for homogeneous and multiphase reactions. It adresses the conditions under which microstructured devices are beneficial, how they should be designed, and how such devices can be integrated in an existing chemical process. Case studies show how the knowledge gained can be applied for particular processes. The textbook is essential for master and doctoral students, as well as for professional chemists and chemical engineers working in this area.
Book Synopsis Intensification of Liquid–Liquid Processes by : Laurence R. Weatherley
Download or read book Intensification of Liquid–Liquid Processes written by Laurence R. Weatherley and published by Cambridge University Press. This book was released on 2020-04-16 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explore and review novel techniques for intensifying transport and reaction in liquid-liquid and related systems with this essential toolkit. Topics include discussion of the principles of process intensification, the nexus between process intensification and sustainable engineering, and the fundamentals of liquid-liquid contacting, from an expert with over forty-five years' experience in the field. Providing promising directions for investment and for new research in process intensification, in addition to a unique review of the fundamentals of the topic, this book is the perfect guide for senior undergraduate students, graduate students, developers, and research staff in chemical engineering and biochemical engineering.
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 An Introduction to Fluid Mechanics and Transport Phenomena by : G. Hauke
Download or read book An Introduction to Fluid Mechanics and Transport Phenomena written by G. Hauke and published by Springer Science & Business Media. This book was released on 2008-08-26 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the foundations of fluid mechanics and transport phenomena in a concise way. It is suitable as an introduction to the subject as it contains many examples, proposed problems and a chapter for self-evaluation.
Book Synopsis Advances in Uranium Ore Processing and Recovery from Non-conventional Resources by : International Atomic Energy Agency
Download or read book Advances in Uranium Ore Processing and Recovery from Non-conventional Resources written by International Atomic Energy Agency and published by Agency. This book was released on 1985 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Book Synopsis Scientific Basis for Nuclear Waste Management XXII: Volume 556 by : David J. Wronkiewicz
Download or read book Scientific Basis for Nuclear Waste Management XXII: Volume 556 written by David J. Wronkiewicz and published by . This book was released on 1999-11-24 with total page 1370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Safe and effective management of nuclear waste provides a broad range of challenges for materials science. Waste processing, waste form and engineered barrier properties, interactions between engineered and geological systems, radiation effects, chemistry and transport of waste species, and long-term predictions of repository performance are just some of the scientific problems facing modern society. This book, the 22nd in a very successful series from MRS, offers an international and inter-disciplinary perspective on the issues, and features developments in both fundamental and applied areas. Topics include: development and characterization of ceramic waste forms; ceramic waste form corrosion; glass waste form processing; glass formulation, properties and structure; glass waste form corrosion; spent nuclear fuel; performance assessment; repository backfill; flow and transport; natural analogues; container corrosion; metal waste form corrosion; radionuclide speciation and solubility; radionuclide sorption; microbial effects; radiation effects; cement waste forms and waste treatment.
Book Synopsis Computational Methods for Multiphase Flow by : Andrea Prosperetti
Download or read book Computational Methods for Multiphase Flow written by Andrea Prosperetti and published by Cambridge University Press. This book was released on 2009-06-25 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thanks to high-speed computers and advanced algorithms, the important field of modelling multiphase flows is an area of rapid growth. This one-stop account – now in paperback, with corrections from the first printing – is the ideal way to get to grips with this topic, which has significant applications in industry and nature. Each chapter is written by an acknowledged expert and includes extensive references to current research. All of the chapters are essentially independent and so the book can be used for a range of advanced courses and the self-study of specific topics. No other book covers so many topics related to multiphase flow, and it will therefore be warmly welcomed by researchers and graduate students of the subject across engineering, physics, and applied mathematics.
Author :Ernst Heinrich Hirschel Publisher :Springer Science & Business Media ISBN 13 :3540708057 Total Pages :507 pages Book Rating :4.5/5 (47 download)
Book Synopsis 100 Volumes of 'Notes on Numerical Fluid Mechanics' by : Ernst Heinrich Hirschel
Download or read book 100 Volumes of 'Notes on Numerical Fluid Mechanics' written by Ernst Heinrich Hirschel and published by Springer Science & Business Media. This book was released on 2009-05-19 with total page 507 pages. Available in PDF, EPUB and Kindle. Book excerpt: In a book that will be required reading for engineers, physicists, and computer scientists, the editors have collated a number of articles on fluid mechanics, written by some of the world’s leading researchers and practitioners in this important subject area.
Book Synopsis The Electrical Conductivity of Aqueous Solutions by : Arthur Amos Noyes
Download or read book The Electrical Conductivity of Aqueous Solutions written by Arthur Amos Noyes and published by . This book was released on 1907 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt:
