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Showing 1 to 15 of 15 for “"Packed Bed Reactors"”.
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Electrochemical Packed Bed Reactors
Made available in DSpace on 2014-12-13T18:55:32Z (GMT). No. of bitstreams: 1 7624150.pdf: 5329964 bytes, checksum: 5fc4b35ef9bbc2df36b3b2cdbab9bb37 (MD5) Previous issue date: 1976
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Experimental and modeling studies using packed bed reactors: Liquid phase ethylene production by hydrogenation of acetylene
… hydrogenation of acetylene was investigated in packed bed reactors (PBR) using a commercial catalyst. The reactor performance of two-phase flow PBRs was assessed experimentally complemented by a validated mathematical model at different scales.</p><p>The selective hydrogenation of acetylene in …
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Packed bed reactors at the pellet scale: magnetic resonance studies of hydrodynamics, mass transport and reaction
Packed bed reactors are widely used in the chemical and petrochemical industries to facilitate heterogeneous catalytic reactions. Despite the widespread use of packed bed reactors in industry, the flow, transport, and reaction phenomena occurring at the scale of individual catalyst pellets is …
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Towards an understanding of mass transfer and hydrodynamics in packed bed reactors using Nuclear Magnetic Resonance
… phenomena that govern the performance of packed bed reactors. The aim of this work is to gain insight into factors that affect the process of fines deposition and mass transfer inside packed beds to ultimately enable optimisation of these processes. Although mass transfer correlations …
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Biological degradation of soluble microbial products in a combined system of anaerobic packed-bed reactors and a down-flow hanging sponge reactor
… and a smaller footprint. An anaerobic up-flow packed-bed reactor maximizes the advantages by retaining a high concentration of biomass in the system, providing sufficient sludge retention time to slow growing anaerobic microorganisms. The inherent configuration of the reactor, however, is prone …
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The potential of immobilied algal cell systems for the removal of mercury from aqueous solution
… volatile form. Continuous-flow studies using packed-bed reactors showed that unstocked agarose exhibited less mercury volatitlization than alginate. Mercury removal efficiency from medium containing 1 mg Hg r by alginate- and agarose-i;nniobilized Ciziorella during 15-day experiments was over …
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Microchemical systems for kinetic studies of catalytic processes
… this end, we have examined the ability of microreactors with a variety of geometries to efficiently obtain accurate kinetic information. This work primarily focuses on microfabricated packed-bed reactors that utilize standard catalyst particles and briefly explores the use of membrane based …
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3D modelling by computational fluid dynamics of local interactions of momentum, mass and heat transfers with catalyst deactivation in gas-solid catalytic reactors of low aspect ratios
Packed beds of gas-solid systems are extensively used as reactors, separators, dryers, filters, heat exchangers and combustors. The design of packed beds requires a detailed knowledge of local dynamics of flow, composition and temperature. Unfortunately, investigations for the development of 3D …
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Modeling the flow of non-Newtonian fluids in packed beds at the pore scale
… materials, subsurface water contamination, packed-bed reactors, and enhanced oil recovery. The general approach to modeling such processes is at the continuum scale. Semi-empirical expressions, such as Darcy's law, are substituted for velocity in the continuity equation, which is then …
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Visualisation of chemistry in flow
… (FDO) patterns, previously only observed in packed bed reactors, were produced in alternative flow fields for the first time. The two systems studied have allowed greater insight into the structure, dynamics and stability of the patterns. Plug-like flow was produced with an agar gelling agent …
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Transition between Flow Regimes in Porous Media Using Magnetic Resonance Velocimetry: From Laminar to Turbulent
… insight into the design and operation of packed bed reactors. Another new observation is that the transition to the unsteady regime is a highly heterogeneous process, where the evolution of the flow instability depends on the pore geometry. Moreover, pixelwise validation was achieved …
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Characterising Adsorption and Mass Transfer in Porous Media
… correlation data of binary liquid mixtures imbibed in various silica supports. These measurements, in combination with a newly developed model for the relaxation of multi-component mixtures, have provided a comprehensive assessment of the ability of this technique to quantify intra-pellet …
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A mathematical model of a high sulphate wastewater, anaerobic treatment system
… is biological sulphate reduction in anaerobic reactors. During anaerobic treatment, sulphate is reduced to sulphide and alkalinity is generated, raising the pH and precipitating many of the heavy metals. The process requires a carbon source as an electron donor. This may be simple organics such …
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Monolith Catalyst Supports for Hydrogen Production
… issues. It is, therefore, desired to shift from packed bed reactors to monolithic reactors to overcome these issues. :Vfonoliths arc attractive due to their high open frontal area., stability, good mass and heat transfer, as well as easy sea.ling up. The main focus of this study is to coat. …
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Desarrollo de un nuevo proceso de combustión con captura de CO2 empleando óxidos metálicos
… of high temperature solid looping cycles using packed bed reactors. It consists in the combustion of methane and CO2 capture in fixed bed reactors using ilmenite as solid oxygen carrier, a low-cost material extensively studied in the literature. The operation at high pressure allows the use of …