Mass Transfer In The Catalytic Liquid Phase Hydrogenation Of Alpha Methylstyrene In A Stirred Reactor
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Mass Transfer In The Catalytic Liquid Phase Hydrogenation Of Alpha Methylstyrene In A Stirred Reactor
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Author : Jacob David Polejes
language : en
Publisher:
Release Date : 1959
Mass Transfer In The Catalytic Liquid Phase Hydrogenation Of Alpha Methylstyrene In A Stirred Reactor written by Jacob David Polejes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1959 with Chemical reactions categories.
Catalytic Hydrogenation Of Alpha Methylstyrene In Liquid Phase In Stirred Reactor
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Author : Douglas Lewellyn Johnson
language : en
Publisher:
Release Date : 1956
Catalytic Hydrogenation Of Alpha Methylstyrene In Liquid Phase In Stirred Reactor written by Douglas Lewellyn Johnson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1956 with Benzene categories.
Selective Hydrogenation Of Alpha Beta Alpha Beta Unsaturated Aldehydes Towards Clean Synthesis Over Noble Metal Catalysts In Mass Transfer Efficient Three Phase Reactors
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Author : Laiqi Zhang
language : en
Publisher:
Release Date : 1998
Selective Hydrogenation Of Alpha Beta Alpha Beta Unsaturated Aldehydes Towards Clean Synthesis Over Noble Metal Catalysts In Mass Transfer Efficient Three Phase Reactors written by Laiqi Zhang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
The hydrodynamics and mass transfer characteristics of a concurrent downflow contactor (CDC) are studied in this work in order to investigate the viability of this bubble column as a catalytic reactor for the hydrogenation of?,?-unsaturated aldehydes. Oxygen/water was used as the system throughout. In order to obtain reproducible results, a very effective gas-liquid separation method was conceived and developed after much trial and error work. Shutdown and deadleg gas holdup measuring methods were compared and it was found that the shutdown method is more reliable than the deadleg method. The hydrogenation of cinnamaldehyde using both in-house-prepared and commercial palladium, platinum and ruthenium catalysts was carried out in stirred tank reactors and cocurrent downflow reactors in order to study the kinetics and mass transfer characteristics and the selectivity towards the corresponding desired product, hydrocinnamaldehyde or cinnamyl alcohol. When palladium catalysts were used the desired product was hydrocinnamaldehyde. The effects of homogenous reactions, type of solvent, catalyst loading, temperature, pressure, reactant concentration and the effects of promoter or poison on the selectivity towards hydrocinnamaldehyde were investigated systematically. Aldehyde acetals were produced in polar solvents, but not in non-polar solvents. Two methods can be used to obtain hydrocinnamaldehyde selectivity without reduction of the carbonyl double bond: (1) by using non-polar solvents such as toluene; (2) by incorporating poisons or promoters into the reactant solution or onto the surface of the catalysts. 97% selectivity to hydrocinnamaldehyde was achieved. The effects of the solvent, temperature, pressure, catalyst loading, promoters, and reactants concentration on the kinetics were studied and the following reaction kinetics are proposed for the hydrogenation of cinnamaldehyde over non-modified palladium/charcoal catalysts in propan-2-ol and in toluene: Ra = kC\(_{Cat}\)C\(_{H2}\)C\(0_{CAL}\) The apparent activation energy varies with themperature range in propan-2-ol and is 65\(\pm\)5 kJ.mol\({-1}\) in toluene.
Selective Hydrogenation Of Alpha Beta Unsaturated Aldehydes Towards Clean Synthesis Over Noble Metal Catalysts In Mass Transfer Efficient Three Phase Reactors
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Author : Laiqi Zhang
language : en
Publisher:
Release Date : 1998
Selective Hydrogenation Of Alpha Beta Unsaturated Aldehydes Towards Clean Synthesis Over Noble Metal Catalysts In Mass Transfer Efficient Three Phase Reactors written by Laiqi Zhang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
The hydrodynamics and mass transfer characteristics of a concurrent downflow contactor (CDC) are studied in this work in order to investigate the viability of this bubble column as a catalytic reactor for the hydrogenation of ?,?-unsaturated aldehydes. Oxygen/water was used as the system throughout. In order to obtain reproducible results, a very effective gas-liquid separation method was conceived and developed after much trial and error work. Shutdown and deadleg gas holdup measuring methods were compared and it was found that the shutdown method is more reliable than the deadleg method. The hydrogenation of cinnamaldehyde using both in-house-prepared and commercial palladium, platinum and ruthenium catalysts was carried out in stirred tank reactors and cocurrent downflow reactors in order to study the kinetics and mass transfer characteristics and the selectivity towards the corresponding desired product, hydrocinnamaldehyde or cinnamyl alcohol. When palladium catalysts were used the desired product was hydrocinnamaldehyde. The effects of homogenous reactions, type of solvent, catalyst loading, temperature, pressure, reactant concentration and the effects of promoter or poison on the selectivity towards hydrocinnamaldehyde were investigated systematically. Aldehyde acetals were produced in polar solvents, but not in non-polar solvents. Two methods can be used to obtain hydrocinnamaldehyde selectivity without reduction of the carbonyl double bond: (1) by using non-polar solvents such as toluene; (2) by incorporating poisons or promoters into the reactant solution or onto the surface of the catalysts. 97% selectivity to hydrocinnamaldehyde was achieved. The effects of the solvent, temperature, pressure, catalyst loading, promoters, and reactants concentration on the kinetics were studied and the following reaction kinetics are proposed for the hydrogenation of cinnamaldehyde over non-modified palladium/charcoal catalysts in propan-2-ol and in toluene: Ra = kC\(-{Cat}\)C\(-{H2}\)C\( 0-{CAL}\) The apparent activation energy varies with themperature range in propan-2-ol and is 65\(\pm\)5 kJ.mol\( {-1}\) in toluene.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 1970
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Dissertations, Academic categories.
Chemical Engineering Progress
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Author :
language : en
Publisher:
Release Date : 1960
Chemical Engineering Progress written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with Chemistry, Technical categories.
Innovations In Green Chemistry And Green Engineering
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Author : Paul T. Anastas
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-13
Innovations In Green Chemistry And Green Engineering written by Paul T. Anastas and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-13 with Science categories.
Processes that meet the objectives of green chemistry and chemical engineering minimize waste and energy use, and eliminate toxic by-products. Given the ubiquitous nature of products from chemical processes in our lives, green chemistry and chemical engineering are vital components of any sustainable future. Gathering together ten peer-reviewed articles from the Encyclopedia of Sustainability Science and Technology, Innovations in Green Chemistry and Green Engineering provides a comprehensive introduction to the state-of-the-art in this key area of sustainability research. Worldwide experts present the latest developments on topics ranging from organic batteries and green catalytic transformations to green nanoscience and nanotoxicology. An essential, one-stop reference for professionals in research and industry, this book also fills the need for an authoritative course text in environmental and green chemistry and chemical engineering at the upper-division undergraduate and graduate levels.
Absorption In Gas Liquid Dispersions Some Aspects Of Bubble Technology
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Author : Friedrich Heinrich Hermann Valentin
language : en
Publisher:
Release Date : 1967
Absorption In Gas Liquid Dispersions Some Aspects Of Bubble Technology written by Friedrich Heinrich Hermann Valentin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1967 with Bubbles categories.
Modeling Of Process Intensification
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Author : Frerich J. Keil
language : en
Publisher: John Wiley & Sons
Release Date : 2007-06-27
Modeling Of Process Intensification written by Frerich J. Keil and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-06-27 with Technology & Engineering categories.
Combining the knowledge involved in process engineering and process modeling, this is the first book to cover all modeling methods applicable to process intensification. Both the editors and authors are renowned experts from industry and academia in the various fields of process modeling and integrated chemical processes. Following an introduction to the topic, the book goes on to look at equipment and operational methods, monolithic catalysis, HEX, micro- and reverse flow reactors, catalytic and reactive distillation, the simulated-moving bed and vibration bubble column as well as ultrasound and ultrasonic reactors. A final chapter is devoted to processes under supercritical conditions. In its treatment of hot topics of multidisciplinary interest, this book is of great value to researchers and engineers alike.
Comprehensive Dissertation Index
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Author :
language : en
Publisher:
Release Date : 1973
Comprehensive Dissertation Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Dissertations, Academic categories.