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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 79 for “"counter current"”.
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Enantioseparation using a counter-current bioreactor
The potential of countercurrent chromatography (CCC) as a small footprint bioreactor/separator for manufacture of enantiopure chiral molecules was explored, using as a model reaction the isolation of L-amino butyric acid (L-ABA) from a DL-ABA racemate and the enantioselectivity of D-amino acid …
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Monoclonal antibody (mAb) purification by counter current chromatography (CCC)
Counter current chromatography (CCC) is a form of liquid liquid chromatography, which the Brunel Institute for Bioengineering (BIB) team have developed to process scale. In this thesis, its application has been successfully extended to the rapid, scalable purification of monoclonal antibodies (mAb) …
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H to infinity optimal control of a counter-current process
… bearing ore and the activated carbon flow in a counter-current fashion. This counter-current flow enables a high percentage of the gold to be recovered. Gold can then be recovered through an elution process. Large amounts of activated carbon are used in the process and a formal multi variable …
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A process for separation by semi-continuous counter-current crystallization
A process is proposed to perform separations via crystallization by using multiple tanks and constraining crystal growth to solid surfaces. Multiple tanks allow multiple recrystallizations to improve product purity and to ensure high recovery of the component of interest. Crystal growth on solid …
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The Simulation of a Controlled Tubular Reactor with Counter-current Heat Transfer
The results of complete simulation of a plug flow reactor and a cascade of five continuous flow stirred tank reactors (CSTR) on a digital computer under transient open loop and controlled conditions are compared with the experimental results of the same system partially simulated as a cascade of …
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Performance index analysis of control systems synthesized for a counter-current process
… output regulation and minimal control effort. A counter-current heat exchanger process (simulating the carbon-in-pulp gold extraction process) has been designed and constructed. The quality of control systems synthesized for this process is gauged using these performance indices. The control of …
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Modelling of fluid flow and kinetics in counter-current reactors for pyrometallurgical refining
… and kinetic (mass transfer) simulation of a counter-current reaction launder (CCRL) for metals refining are presented. Physical modelling was conducted in a 200 cm long (L) by 20 cm wide (W) channel, using tetrachlorethylene to model 'metal' and water to model 'slag'. A thermal tracer …
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Combined bioreaction and separation in a simulated counter-current chromatographic bioreactor-separator system
… bioreaction and separation in a simulated counter-current chromatographic bioreactor-separator system (SCCR-S). The SCCR-S system consisted of twelve 5.4cm i.d x 75cm long columns packed with calcium charged cross-linked polystyrene resin. Three bioreactions, namely the saccharification of …
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Flooding and non-equilibrium in counter-current flows with reference to pressurised water reactors
… downcomer annulus. The experiments involved the countercurrent flows of air and water and the data were compared with existing flooding correlations for tubes. The comparison revealed the inadequacy of the existing correlations. In the Phase 1 test section arrangement, it was found experimentally …
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Drying of portland cement raw material slurries:predicting the performance of a counter-current spray drier
An extensive review of literature has been carried out concerning the drying of single drops, sprays of droplets and the prediction of spray drier performances. The experimental investigation has been divided into two broad parts mainly: (1) Single Drop Experiments, and (2) Spray Drying and …
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Chemistry at liquid-liquid interfaces: con- and counter-current extraction and biologically active membranes in microchannels
… in which one phase is left stationary, con- and counter-current flow. It is found that reversed-micelle extraction does not behave like typical diffusion based extraction. What is observed is an unusual perturbation at the liquid-liquid interface during the extraction that leads to turbulent flow …
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Development of an efficient method for isolation and purification of bioactive Compounds from panax ginseng and rhodiola rosea using high performance counter current chromatography
… purification techniques using high performance counter-current chromatography (HPCCC) are widely applied for this purpose. High performance counter-current chromatography (HPCCC) is a form of liquid liquid chromatography with the higher “g” ” field, which the Brunel Institute for Bioengineering …
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Developing Co-current and Counter-current Spray Drying Computational Fluid Dynamics (CFD) Simulation Studies to Predict the Quality of Microencapsulated Fish Oil with Egg White Hydrolysates Powders
… were performed to study the effect of co-current and counter-current spray drying configurations on the quality of microencapsulated fish oil with EWH powders in the last section of this work. Also, the separation of powder particles from drying air at the spray dryer’s cyclone separator …
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Removal of metal ions from solution by foam fractionation methods
… foam stability and foam drainage, and the counter-current flow of liquid and foam. The experimental results obtained were tested with models proposed for the counter-current liquid-foam flow. It was found that the pattern of flow is different at low -s liquid flow from that at high flow …
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A Mechanistic Model for Flooding in Vertical Tubes
In a counter-current two-phase flow system, flooding can be defined as the onset of flow reversal of the liquid component which results in an upward co-current flow. Flooding in the surge line of pressurized water reactors poses a significant technical challenge in the analysis of several …
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A numerical investigation of the influence of monsoonal wind reversals over the East African coastal ocean
… the Somali basin is given. discussing the Somali Current East African Coastal Current, South Equatorial Counter Current Southern Gyre, and the Great Whirl The motivation of this dissertation is to improve the understanding of the circulation patterns within the Somali Basin from intra seasonal to …
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Surface circulation in the KwaZulu-Natal Bight and its impact on the connectivity of marine protected areas
… surrounding coastline. As a result, the Agulhas Current is forced offshore, allowing the formation of complex circulation features on the KwaZulu-Natal Bight's shelf that assist with recruitment and retention of marine organisms in this region. This study aims to gain a deeper understanding of …
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Effects of Variables on a Soaker-Stripper Reactor for Thermal Cracking of Deasphalted Oil
… of the 553 °C+ fraction over 50%. One important current challenge is to increase that conversion level by optimization of the reactor and the flow regime inside it. In this work, a pilot plant was designed, procured and built to investigate the thermal cracking of DAO with steam in a …
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Analysing aspects of the performance of an ironblast furnace
… its behaviour. This involved the simulation of a counter current compressible gas flow, through a packed bed, dealing with the momentum and thermal energy of both phases. Directional resistances were added to the gas momentum, so as to account for the interphase friction caused by the packed bed. …
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