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Showing 1 to 20 of 28 for “"trickle bed"”.
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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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Solid-liquid mass transfer in trickle bed reactors
Hydrodynamic multiplicity in the trickle flow, or low interaction, regime is a well documented phenomenon. Multiple hydrodynamic states are often presented in the form of hysteresis loops where the hydrodynamic parameter studied are shown as a function of the operating history of the bed, i.e. …
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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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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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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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Hydrogen-water isotope exchange in a trickle bed column by process simulation and 3D computational fluid dynamics modelling
… co-currently and counter-currently through a trickle bed column. Numerical simulations were performed by process design and fluid flow modelling. The missing physical properties of deuterium, and particularly of tritium isotopologues in gaseous and water forms, were predicted and validated …
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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.
… were carried out in a continuous flow isothermal trickle bed reactor using crude oil as a feedstock and commercial cobaltmolybdenum on alumina (Co-Mo/¿-Al2O3) as a catalyst. The reactor temperature was varied from 335°C to 400°C, the hydrogen pressure from 4 to10 MPa and the liquid hourly space …
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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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Investigation of Multiphase Reactor Hydrodynamics Using Magnetic Resonance Imaging
… considered: a co-current upflow gas-liquid-solid bed, a co-current downward trickle bed (gas, liquid, solid), and a gas-solid fluidised bed. These reactors were selected as they commonly demonstrate local hydrodynamic anisotropy which affects the global performance of industrial units. MRI was …
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Analisador virtual para a determinação do teor dos contaminantes mapd em um reator tricklebed
… metilacetileno e propadieno (MAPD) em um reator trickle bed em uma indústria de propileno no Brasil. A partir da coleta de dados de processos de uma campanha catalítica, coletados por cromatógrafos a gás, termopares e medidores de vazão, foram desenvolvidos modelos de calibração multivariada …
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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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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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Ultra-fast Imaging of Two-Phase Flow in Structured Monolith Reactors; Techniques and Data Analysis
… traditional chemical engineering systems such as trickle bed and slurry reactors. However, being a relatively new design, its associated flow phenomena and design procedures are not rigorously understood, which is retarding its acceptance in industry. Traditional observations are unable to provide …
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