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Contribution A Letude De Lenrobage Des Poudres En Lit Fluidise
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Book Synopsis Contribution à l'étude de l'enrobage des poudres en lit fluidisé by : Khashayar Saleh
Download or read book Contribution à l'étude de l'enrobage des poudres en lit fluidisé written by Khashayar Saleh and published by . This book was released on 1998 with total page 237 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cette étude est consacrée à l'enrobage en discontinu des particules solides, poreuses ou non-poreuses, en lit fluidisé par l'injection d'une solution aqueuse contenant 200 kg/m3 de chlorure de sodium. Nous avons mis au point un dispositif expérimental qui a permis d'étudier l'influence de la taille et la distribution de la taille, et de la porosité des particules sur l'efficacité et la stabilité de l'opération ainsi que sur les mécanismes de croissance. Par ailleurs, nous avons aussi étudié l'influence des conditions opératoires sur la morphologie du dépôt. Les résultats ont montré que pour les particules de tailles supérieures à 160 um, la croissance des particules est gouvernée par le recouvrement en surface. En revanche, la croissance des particules de tailles inférieures à 160 um se fait par le mécanisme d'agglomération. Cependant, l'enrobage de fines particules peut être réalisé en les mélangeant avec une quantité adéquate de grosses particules de même nature. En ce qui concerne la morphologie du dépôt, les résultats expérimentaux ont montré qu'une diminution de la taille des gouttes (augmentation du débit d'air d'atomisation) ou de la tension superficielle (ajout d'un surfactant) peuvent conduire à un dépôt uniforme et compact à la surface de particules solides. Nous avons aussi développé des modèles de connaissances basés sur le concept du bilan de population, qui représentent trés bien l'ensemble des résultats expérimentaux obtenus au cours de cette étude.
Book Synopsis Contribution à l'étude de l'enrobage des particules solides en lit fluidisé by : Réda Chérif
Download or read book Contribution à l'étude de l'enrobage des particules solides en lit fluidisé written by Réda Chérif and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: CE TRAVAIL CONCERNE L'ETUDE DE L'ENROBAGE EN LIT FLUIDISE DE PARTICULES DE SABLE PAR L'INJECTION D'UNE SOLUTION AQUEUSE DE CHLORURE DE SODIUM. NOUS AVONS MIS AU POINT UN DISPOSITIF EXPERIMENTAL QUI A PERMIS D'ETUDIER L'INFLUENCE DES PARAMETRES OPERATOIRES: TEMPERATURE ET VITESSE DE L'AIR, DIAMETRE MOYEN ET MASSE DU SUPPORT, CONCENTRATION ET DEBIT DE LA SOLUTION, DEBIT DE L'AIR D'ATOMISATION, NATURE ET POSITION DE L'ATOMISEUR, SUR LA CROISSANCE DES PARTICULES ET L'EFFICACITE DE L'OPERATION. NOS RESULTATS ONT MONTRE QUE, POUR LE SYSTEME SABLE-NACL, LA CROISSANCE DES PARTICULES SE FAIT ESSENTIELLEMENT PAR RECOUVREMENT EN SURFACE. NOUS AVONS PROPOSE D'UNE PART DEUX LOIS EMPIRIQUES QUI RELIENT LES TAUX DE CROISSANCE ET D'ENROBAGE AUX PARAMETRES DE L'ETUDE, ET D'AUTRE PART UN MODELE PHYSIQUE BASE SUR LE CONCEPT DU BILAN DE POPULATION EN TENANT COMPTE DE LA CROISSANCE PAR DEPOT
Book Synopsis Contribution à l'étude de la granulation des poudres en lit fluidisé by : Véronique Pont
Download or read book Contribution à l'étude de la granulation des poudres en lit fluidisé written by Véronique Pont and published by . This book was released on 2000 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE ETUDE EST CONSACREE A LA GRANULATION DE PARTICULES SOLIDES EN LIT FLUIDISE DISCONTINU PAR LA PULVERISATION DE SOLUTIONS AQUEUSES DE LIANTS (POLYMERES OU SELS MINERAUX). OUTRE LA COMPREHENSION DES PHENOMENES QUI SE PRODUISENT A L'ECHELLE GLOBALE, L'OBJECTIF ESSENTIEL DE CE TRAVAIL EST DE MIEUX COMPRENDRE L'INFLUENCE DES PHENOMENES QUI SE PRODUISENT A L'ECHELLE LOCALE SUR LA CINETIQUE DE CROISSANCE ET SUR LA RESISTANCE MECANIQUE DES AGGLOMERATS FORMES. NOUS AVONS DONC ETUDIE L'INFLUENCE DES PARAMETRES LIES AU PROCEDE (VITESSE DE L'AIR DE FLUIDISATION, DEBIT DE LA SOLUTION LIANTE, CONCENTRATION EN LIANT), DES PROPRIETES DES PARTICULES SOLIDES (TAILLE, FORME, POROSITE ET SOLUBILITE) ET LA VISCOSITE DE LA SOLUTION LIANTE (ENTRE 1 ET 185 CP) SUR LA CINETIQUE DE CROISSANCE DE TAILLE DES AGGLOMERATS FORMES. AFIN D'ETUDIER L'INFLUENCE DES PARAMETRES LIES A LA MOUILLABILITE DE LA SURFACE DES PARTICULES, LA TENSION SUPERFICIELLE DES SOLUTIONS A ETE MODIFIEE ENTRE 72 A 33 MN/M, EN UTILISANT DES TENSIO-ACTIFS ET L'ANGLE DE CONTACT A ETE MODIFIE ENTRE 38\ ET DES VALEURS SUPERIEURES A 90\ PAR UN TRAITEMENT CHIMIQUE CONDUISANT A L'HYDROPHOBISATION PARTIELLE OU TOTALE DE LA SURFACE DES PARTICULES. NOS RESULTATS ONT MONTRE QU'UNE AUGMENTATION DE LA TENSION SUPERFICIELLE, UNE DIMINUTION DE L'ANGLE DE CONTACT ET DE LA TAILLE DES PARTICULES FAVORISENT L'AGGLOMERATION DES PARTICULES, TANDIS QUE LA VISCOSITE DE LA SOLUTION N'A PAS UN EFFET SIGNIFICATIF SUR LA CROISSANCE. AINSI L'AGGLOMERATION DES POUDRES EN LIT FLUIDISE EST ESSENTIELLEMENT DOMINEE PAR LES FORCES CAPILLAIRES (FORCES STATIQUES) ET NON PAS PAR LA FORCE DE DISSIPATION VISQUEUSE. DE PLUS, NOS RESULTATS ONT MONTRE QUE LA CINETIQUE DE SECHAGE DES SOLUTIONS PEUT AUSSI AVOIR UN EFFET
Book Synopsis Enrobage en lit fluidisé by : François Keledjian
Download or read book Enrobage en lit fluidisé written by François Keledjian and published by . This book was released on 2007 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aujourd’hui, le lit fluidisé est largement mis à profit dans le domaine pharmaceutique, notamment pour des opérations de mélange, de granulation humide, de séchage, de pelletisation/sphéronisation ou d’enrobage. Les différents types de lits fluidisés utilisés pour l’enrobage pharmaceutique sont caractérisés par des éléments spécifiques dans leur conception et fonctionnement et par des domaines d’applications propres. Les systèmes d’enrobage à pulvérisation par le bas et à pulvérisation tangentielle conduisent à des enrobages de meilleure qualité que les systèmes à pulvérisation par le haut. Les récents progrès techniques des équipements et l’avancée des connaissances en formulation galénique rendent possibles de nombreuses applications galéniques innovantes de l’enrobage en lit fluidisé. Le dépôt de l’agent d’enrobage sous forme liquide peut être remplacé par l’utilisation de poudres sèches ou par un procédé de fusion lipidique et ce pour tous les systèmes de pulvérisation. Le microenrobage lipidique est préférentiellement réalisé en lit fluidisé avec pulvérisation par le haut alors qu’une pulvérisation par le bas ou tangentielle est plutôt employée pour l’enrobage de pellets par des poudres sèches. Le lit fluidisé avec pulvérisation par le bas offre la possibilité de pouvoir préparer des formes galéniques innovantes et/ou pour des voies d’administration particulières comme : des poudres sèches à inhaler (DPI) ; des pellets enrobés pour libération colique ; des poudres issues des biotechnologies pour administration épidermique à produire en lots de faible taille ; des chewing gums à libération ciblée et prolongée du principe actif et des gélules végétales enrobées gastrorésistantes prêtes à l’emploi. Enfin, le désir d’enrober des particules toujours plus petites a conduit au développement d’un nouveau type d’équipement : le lit fluidisé rotatif. : Galénique ; Enrobage ; Pelliculage ; Lit Fluidisé ; Film ; Poudre ; Libération prolongée ; Gastrorésistance.
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.
Download or read book Granulation written by Agba D. Salman and published by Elsevier. This book was released on 2006-11-24 with total page 1403 pages. Available in PDF, EPUB and Kindle. Book excerpt: Granulation provides a complete and comprehensive introduction on the state-of-the-art of granulation and how it can be applied both in an academic context and from an industrial perspective. Coupling science and engineering practices it covers differing length scales from the sub-granule level through behaviour through single granules, to bulk granule behaviour and equipment design. With special focus on a wide range of industrially relevant areas from fertilizer production, through to pharmaceuticals. Experimental data is complemented by mathematical modelling in this emerging field, allowing for a greater understanding of the basis of particle products and this important industry sector.Four themes run through the book: 1. The Macro Scale processing for Granulation – including up to date descriptions of the methods used for granulation and how they come about and how to monitor – on-line these changes.2. The Applications of granulation from an industrial perspective, with current descriptive roles and how they are undertaken with relevance to industry, and effective properties.3. Mechanistic descriptions of granulation and the different rate processes occurring within the granulator. This includes methods of modelling the process using Population – Balance Equations, and Multi-level Computational Fluid Dynamics Models.4. The Micro Scale: Granules and Smaller, looking at single granules and there interactions and modelling, while also considering the structure of granules and their constituent liquid bridges. * Covers a wide range of subjects and industrial applications * Provides an understanding of current issues for industrial and academic environments* Allows the reader an understanding of the science behind engineered granulation processes
Book Synopsis Dictionary of Civil Engineering by : Jean-Paul Kurtz
Download or read book Dictionary of Civil Engineering written by Jean-Paul Kurtz and published by Springer Science & Business Media. This book was released on 2007-05-08 with total page 1520 pages. Available in PDF, EPUB and Kindle. Book excerpt: I am pleased to present a work which marks a milestone in the history of public works and, more precisely, in that of permanent structures—a comprehensive dictionary of Civil Engineering terms. Since the beginning of time, Man has always tried to find a means to clear the obstacles which nature erected to displace him. With the first tree trunk thrown across a river, man sought to improve the crossing structure. After the invention of the wheel, and to satisfy his thirst for conquest (Roman ways), and comfort (aqueducts), man built bridges that became a preremptory necessity to move quickly. Thus, Man started to build wooden and masonry works. With the passing centuries, the builders became masters in the art of building masonry works. Then came the Industrial Revolution and the advent of the steel (1864), which was closely followed by the invention of the reinforced concrete (1855). The need for railways and improving the road network inspired great works of crossing such as viaducts and tunnels. The boom of the railway network and the development of the car required the construction of an increasing number of new structures. This phenomenon continues today with hundreds of structures built each year throughout the world.
Book Synopsis Processing of Particulate Solids by : J.P. Seville
Download or read book Processing of Particulate Solids written by J.P. Seville and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over half of the products of the chemical and process industries are sold in a particulate form. The range of such products is vast: from agrochemicals to pigments, from detergents to foods, from plastics to pharmaceuticals. However, surveys of the performance of processes designed to produce particulate products have consistently shown inadequate design and poor reliability. `Particle technology' is a new subject facing new challenges. Chemical and process engineering is becoming less concerned with the design of plants to produce generic simple chemicals (which are often single phase fluids) and is now more concerned with speciality `effect' chemicals which may often be in particulate form. Chemical and process engineers are also being recruited in increasing numbers into areas outside their tranditional fields, such as the food industry, pharmaceuticals and the manufacture of a wide variety of consumer products. This book has been written to meet their needs. It provides comprehensive coverage of the technology of particulate solids, in a form which is both accessible and concise enough to be useful to engineering and science students in the final year of an undergraduate degree, and at Master's level. Although it was written with students of chemical engineering in mind, it will also be of use and interest to students of other disciplines. It comprises an account of the fundamentals of teh subject, illustrated by worked examples, and followed by a wide range of selected applications.
Book Synopsis Fluidization Engineering by : D. Kunii
Download or read book Fluidization Engineering written by D. Kunii and published by Elsevier. This book was released on 2013-10-22 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluidization Engineering, Second Edition, expands on its original scope to encompass these new areas and introduces reactor models specifically for these contacting regimes. Completely revised and updated, it is essentially a new book. Its aim is to distill from the thousands of studies those particular developments that are pertinent for the engineer concerned with predictive methods, for the designer, and for the user and potential user of fluidized beds. Covers the recent advances in the field of fluidization. Presents the studies of developments necessary to the engineers, designers, and users of fluidized beds.
Author :John Henry Lorentz Publisher :Historical Dictionaries of Asia, Oceania, and the Middle East ISBN 13 : Total Pages :570 pages Book Rating :4.F/5 ( download)
Book Synopsis Historical Dictionary of Iran by : John Henry Lorentz
Download or read book Historical Dictionary of Iran written by John Henry Lorentz and published by Historical Dictionaries of Asia, Oceania, and the Middle East. This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.
Book Synopsis Powder Technology and Pharmaceutical Processes by : Dominique Chulia
Download or read book Powder Technology and Pharmaceutical Processes written by Dominique Chulia and published by Elsevier Science & Technology. This book was released on 1994 with total page 557 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hardbound. This volume offers a multidisciplinary approach to the operations most commonly used in processing solids in the field of pharmacy and also in the fields of fine chemicals, cosmetics, foods, etc. The authors combine the triple standpoint of formulation, physical characterization of materials and process engineering and have selected the basic facts needed to understand the phenomena by which molecules become particles, particles become granules and granules become tablets, extrudates, microcapsules, etc. These operations are then described in very practical terms, including assessment of their effectiveness and limitations, and critical steps are highlighted.About twenty operations carried out on divided solids are described, ranging from crystallization to formulation, in a manner intended to be within the grasp of all involved: it is not a book solely for specialists, but offers a multidisciplinary background and a methodological help to p
Download or read book Liquid Atomization written by L.P. Bayvel and published by Routledge. This book was released on 2019-01-22 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering the basics of liquid atomization, this book familiarizes readers with the physical processes of liquid atomization, the main types of atomizers and their design, measurements of spray characteristics, experimental investigations of atomizers, and application of atomizers. It demonstrates how to calculate and design atomizers and how to mea
Book Synopsis Historical Dictionary of Pakistan by : Shahid Javed Burki
Download or read book Historical Dictionary of Pakistan written by Shahid Javed Burki and published by . This book was released on 1999 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pakistan is unlike most other countries in the emerging world. It is one of the two nations – the other being the state of Israel – founded on the basis of religion. Although it was created to provide a homeland for the Muslim community of British India, in its original form it was able to accommodate only about half of the people of Islamic faith who lived in the subcontinent. Pakistan’s birth in 1947 resulted in one of the largest movements of people in human history when some 14 million people left their homes, with 8 million Muslims leaving India for what is now Pakistan and 6 million Hindus and Sikhs moving in the opposite direction. This was the first large-scale incidence of ethnic cleansing the world was to witness. --
Book Synopsis Construction Dictionary by : Nawic Education Foundation
Download or read book Construction Dictionary written by Nawic Education Foundation and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive listing of the terms and phrases used in construction. Included are many that are encountered daily on the jobsite or in the construction office.
