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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Trickle-bed reactor"”.
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Catalytic hydrodenitrogenation and hydrodeoxygenation of model compounds in a trickle bed reactor
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1983.
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Local liquid velocity measurement of trickle bed reactor using digitial industrial X-ray radiography
<p>"Trickle Bed Reactors (TBRs) are fixed beds of particles in which both liquid and gas flow concurrently downward. They are widely used to produce not only fuels but also lubrication products. The measurement and the knowledge of local liquid velocities (VLL) in TBRs is less which is essential …
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Selective oxidation of methane in a trickle bed reactor over a platinum-based catalyst
… to methanol was possible with weakly adsorbed oxygen species over transition metal surfaces such as Ag and Pt at high oxygen and water partial pressures. Recent experimental studies also indicated that the presence of water through site blocking action had beneficial effects on catalytic …
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Catalytic hydrodeoxygenation of dibenzofuran in a trickle bed reactor : kinetics, poisoning, and phase distribution effects
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1988.
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Investigation of local velocities and phase holdups, and flow regimes and maldistribution identification in a trickle bed reactor
"Trickle bed reactors are packed beds of catalyst on which gas and liquid reactants flow concurrently downward. In this work, the experimental work was carried out in 0.14 m diameter Plexiglas column using air-water system flowing over a packed bed of 3 mm glass bead particles. The local liquid and …
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Kinetic Modelling Simulation and Optimal Operation of Trickle Bed Reactor for Hydrotreating of Crude Oil. Kinetic Parameters Estimation of Hydrotreating Reactions in Trickle Bed Reactor (TBR) via Pilot Plant Experiments; Optimal Design and Operation of an Industrial TBR with Heat Integration and Economic Evaluation.
… HDT process that can be confidently applied to reactor design, operation and control, the accurate estimation of kinetic parameters of the relevant reaction scheme are required. This thesis aims to develop a crude oil hydrotreating process (based on hydrotreating of whole crude oil followed by …
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MULTIPHASE REACTION STUDIES IN STIRRED TANK AND FIXED BED REACTORS
A biphasic stirred tank reactor and a trickle bed reactor were studied to understand complex multiphase reactor behavior arising from mass transfer effects on reactions and to improve modeling accuracy for rational design and optimization.
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The aerobic, water-assisted selective oxidation of methane over platinum-based catalysts
… investigated initially in a gas-phase, fixed bed reactor that is equipped with a steam generator. Initial results from the selective oxidation of methane yielded CO2. Accidentally flooding the reactor resulted in the formation of selective oxidation products such as methanol, methoxymethanol …
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Hydrodynamics of trickle bed reactors (TBRS) packed with industrial catalyst using advanced measurement techniques
… characteristics on the hydrodynamics od a trickle bed reactor (TBR) have been investigated using advanced measurements techniques of Gamma-ray densitometry (GRD) and Optical fiber probe and conventional measurement techniques of high-frequency differential pressure transducer and load cell. …
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Hidrogenação de ácido levulínico a gama-valerolactona empregando fosfetos de metais de transição suportados em sílica
… evaluation were performed in a three phase trickle bed reactor, using H2 as hydrogen source and water as solvent, at 30 bar, 125 ˚C and weight hourly space velocity of 15 h -1 . In such conditions, theoretical calculations showed the absence of mass-transfer limitations. Among the evaluated …
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The thermodynamics, mechanism and kinetics of the catalytic conversion of propylene and water to diisopropyl ether over amberlyst 15
… exchange resin catalyst. It was produced in a trickle bed reactor at pressures between 1 bar and 60 bar, at temperatures between 70°C and 160°C and at overall propylene to water ratios between 1:5 and 10:1. Reaction proceeded in the liquid phase within the catalyst particles. The only reactions …
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NMR Relaxometry and Diffusometry Studies for Investigating Heterogeneous Catalysis
The work described in this thesis mainly concerns the development and implementation of nuclear magnetic resonance (NMR) methods to provide quantitative information on chemical conversion within a novel NMR compatible trickle-bed reactor (TBR). Techniques to map the distribution of chemical species …
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Hydrogen-water isotope exchange in a trickle bed column by process simulation and 3D computational fluid dynamics modelling
… light and heavy waters for recycling to fusion reactors or for low level nuclear deposits. This thesis presents the hydrogen-water isotope exchange reaction that is taking place co-currently and counter-currently through a trickle bed column. Numerical simulations were performed by process …
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Magnetic Resonance Studies of Three-Phase Heterogeneous Catalytic Hydrogenation Reactions
The work described in this thesis focuses on the development and implementation of nuclear magnetic resonance (NMR) methods to study heterogeneously catalysed hydrogenation reactions, under continuous reaction conditions. The techniques developed aimed to elucidate the chemical composition inside …
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Catalytic Upgrading of Lignin From Biomass
… solid residue. Using a custom-built flow-through reactor, we determined the mechanisms under which the catalyst was rapidly deactivating, we learned what factors limit rates of lignin extraction from biomass, and we began to understand how the biosynthetic production of lignin in the plant …
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Novel, High Activity Hydroprocessing Catalysts: Iron Group Phosphides
… catalysts were tested in a three-phase trickle bed reactor for the simultaneous hydrodenitrogenation (HDN) of quinoline and hydrodesulfurization (HDS) of dibenzothiophene using a model liquid feed at realistic conditions (30 atm, 370 °C). The reactivity studies showed that the nickel …
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Preparation and Reactivity of Niobium-Containing Hydrotreating Catalysts
… catalysts were tested in a three-phase trickle-bed reactor for the simultaneous hydrodenitrogenation (HDN) of quinoline and hydrodesulfurization (HDS) of dibenzothiophene. The niobium oxynitride presented low HDS activity and moderate HDN activity, whereas the supported bimetallic …
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Hydrodynamics Of Trickle Bed Reactors: Measurements And Modeling
… tools to assist us in performance evaluation of trickle bed reactors: TBRs). The study focuses on experimental characterization of the flow distribution, and development of computational fluid dynamics: CFD) model of trickle flow. The experimental study has been performed to examine the quality …
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Hydrocracking of long chain n-Paraffins under Fischer-Tropsch conditions
… Fischer-Tropsch conditions in a plug-flow fixed trickle-bed reactor equipped with a homogeneously operating evaporator and on-line GC-FID analysis. It was found that none of the bimetallic catalysts produced showed any greater tolerance to carbon monoxide when compared to the monometallic …
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