Global ETD Search
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 129 for “"Fixed Bed"”.
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Modeling for anaerobic fixed-bed biofilm reactors
… physical and chemical aspects of the anaerobic fixed-bed biofilm reactors. In order to investigate the mechanism of equilibrium in an anaerobic biofilm reactor, a non-equilibrium model was derived from the equilibrium model to simulate the gas transfer process involved in biogas production. The …
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Simulation of a fixed-bed methanation reactor.
Thesis: M.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1973
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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 exchange zone height of a fixed-bed cation exchanger
no abstract provided by author
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Gas phase heterogeneous catalyst performance testing in laboratory fixed-bed reactors
… catalysts for gas phase reactions in tubular fixed bed reactors is considered. Transport limitations and particularly internal mass transfer limitations are often cited in this case. Many have given general discussions and guides for effective catalyst performance testing, reviewed or put …
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Correlation by dimensional analysis of breakthrough curves in fixed-bed adsorption systems
Includes bibliographical references.
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Microbial Reduction of Perchlorate in Fixed Bed Biofilm Reactors for Water Treatment
The concept of biofilm structures (thin biofilm and large microbial aggregates) growing in porous media and their effect on the responses of a BAC to changes in influent dissolved oxygen (DO) levels was studied. The effect of mass transfer resistance that can reduce oxygen's negative effect on …
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A CFD Model for a Fixed Bed Reactor for Fischer Tropsch Reaction using Ansys
… types of reactors used for commercial FT, fixed bed tubular reactors are among the most common type of reactor. However, there is a big challenge faced by these tubular reactors. FT is a highly exothermic process and therefore, heat removal in these reactors is needed to be highly efficient …
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Computational Fluid Dynamics of High Temperature Shift Reaction of Reformate Gas in Fixed Bed and Membrane Reactors
… the CFD model was validated with experimental fixed bed reactor (FBR) data and experimental MR data respectively. Comparison between operating the MR in counter-flow configuration versus co-flow configuration revealed that the counter-flow configuration is marginally better in terms of CO …
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Effects of various aqueous environmental conditions on the removal of fluoride in fixed bed column reactors packed with calcium hydroxyapatite pellets
… of more effective fluoride adsorbents. Fixed-bed column tests were conducted using hydroxyapatite pellets as the adsorbent material. The nature of its interaction with water quality parameters including pH and the concentrations of fluoride, carbonate, calcium and phosphate was observed …
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Poly(ethylenimine)-Functionalized Pyroxene Nanoparticles Embedded on Diatomite for Removal of Total Organic Carbon from Industrial Wastewater: Batch and Fixed-bed studies
… industrial wastewater in batch and contenuious fixed-bed column studies under various conditions. Our study includes arrays of characterization techniques for the prepared nanoparticles and for Diatomite (commonly used filter aid) before and after embedding it with the nanoparticles at a very …
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JEMEZ RIVER CASE STUDY: UTILIZING A FROUDE NUMBER SIMILITUDE PHYSICAL MODEL, 1-D MOBILE BED NUMERICAL MODEL, AND A 2-D FIXED BED NUMERICAL MODEL FOR WEIR DESIGN INSIGHT
… healthy upstream riparian vegetation. Localized bed scour began to occur just downstream of the Jemez Weir following construction. The United States Army Corps of Engineers (USACE) built the structure in 2003 and developed a HEC-RAS model in 2010 to re-evaluate the long term bed degradation …
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Gas purification by short cycle pressure swing adsorption. Experimental and theoretical studies of a fixed bed adsorption process for the separation of carbon dioxide from air at ambient temperatures using molecular sieve 5A and activated charcoal adsorbents.
… cyclic operation was achievedusing a pair of fixed bed adsorbers. At any one time the feed gas entered one bed at a high pressure and part of the purified gas was returned to the other bed at a reduced pressure to provide countercurrent regeneration of the adsorbent. The beds of adsorbent used …
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Kinetics and Reaction Engineering Aspects of Syngas Production by the Heterogeneously Catalysed Reverse Water Gas Shift Reaction
… The experiments were performed in a down-flow fixed bed quartz reactor at atmospheric pressure. The reverse water gas shift (RWGS) reaction was examined in both the forward and reverse direction. In addition to these experiments, the consecutive reaction of CO to CH4 was also studied. The …
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