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Showing 1 to 20 of 25 for “"Chemical separation"”.
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Architecting an electro-chemical separation platform : from the business case to the first commercial product
… gaining significant tractions as a viable separation technique due to its low energy consumption, its intrinsic reversibility and its reagent free nature. As most companies thrive towards a more sustainable approach, electro-chemical based process become more and more attractive. The group …
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Infinite dilution activity coefficient measurements of different organic solutes in cyrene as a potential green solvent for chemical separation processes
… for the degree of Master of Engineering in Chemical Engineering, Durban University of Technology, Durban, South Africa, 2024.
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The Magnetically Assisted Chemical Separation (MACS) Process: Determination of the Sorption Capacity of Ferromagnetic Microparticles Coated With Octyl(Phenyl)-N,N-Diisobutylcarbamoylmethylphosphine Oxide (CMPO) Using Neutron Activation Analysis
Made available in DSpace on 2017-07-06T18:48:53Z (GMT). No. of bitstreams: 3 Kaminski_Michael_D_MS.pdf: 46897775 bytes, checksum: 69d8f3318d129fea8c5c53e7fb3e2236 (MD5) Kaminski_Michael_D_MS_ABS.pdf: 1250313 bytes, checksum: 11084fec33d4babb72739a4c2621def5 (MD5) license.txt: 4813 bytes, checksum: …
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Non-Equilibrium Transport Across Liquid Membranes Using Coordination Cages
… extracting molecules, offering potential for chemical separation systems. However, the equilibrium constraint within bulk liquid membrane systems limits molecular transport efficiency to 50%, hindering widespread adoption. This thesis addresses this limitation by innovatively propelling …
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Irreversibilities and nonidealities in desalination systems
… the actual performance obtained. Least work of separation for a desalination system is derived and generalized to apply to all chemical separation processes driven by some combination of work, heat, and chemical energy (fuel) input. At infinitesimal recovery, least work reduces to the minimum …
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A study of the comparative methods for the rare earth determination in bones and the rare earth content in human bones
… Method, and the Oxalic Acid Method, for the chemical separation of the rare earth group from the other elements in bone ash have been investigated and the difficulties of each of the methods have been cited. A method separation based on the use of oxalic acid as the precipitating agent has …
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Transport of Molecular Cargoes By Coordination Cages Between Immiscible Liquid Phases
Directed transport of materials against chemical potential gradients is a fundamental feature of living systems, underpinning processes that range from transport through cell membranes to neurotransmission. The development of artificial active cargo transport could enable new modes of chemical …
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The mobility of radiocesium and plutonium in Roach Lake in southern Nevada
… the plutonium analysis was performed, after chemical separation, by the detection of its alpha particle emissions with surface barrier detectors. Strontium-90 was determined at only one site, after extraction from the samples, by measuring its daughter yttrium-90 with a gas proportional …
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Recycling of plastics derived from end-of-life (EOL) electronic equipment
This research work focuses on a chemical process to separate mixed plastics from EOL electronic equipment.;The most prominent components of waste plastics, PC (Polycarbonate), PS (Polystyrene) and ABS (Acylonitrile Butadiene Styrene) from obsolete computers are taken to be samples in this work. …
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Chemistry and biology of tricarbonyl complexes of technetium and rhenium
… groups owing to their position in the spectrochemical series. Therefore, these four compounds, M(CO)3(LoR), can be considered structural models for [M(H2O)3(CO)3]+. The reaction of [Re(CO)3(sol)3]+ (sol = H20, MeOH, MeCN) with K[HB(pz)3] (KTp) has yielded a variety of products depending on the …
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Fabrication of Zeolite MFI Membranes on Low Cost Polymer Supports
… in US is attributed to energy intensive chemical separation processes, such as distillation. The alternative membrane-based separation could save up to 90% energy consumption with outstanding separation performance. Zeolite MFI membranes have been demonstrated for xylene and butane isomer …
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Development of a thermometric sensor for fructosyl valine and fructose using molecularly imprinted polymers as a recognition element
… is to mold a material (with the desired chemical properties) around individual molecules. Upon removal of the molecular templates, one is left with regions in the molded material that fit the shape of the template molecules. Thus, molecular imprinting results in materials that can …
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Characterization and applications of pulsed millisecond glow discharge sources
… from coupled methods involving a chromatographic separation followed by mass spectrometric detection. These techniques are employed in modern laboratories in the form of gas and liquid chromatography mass spectrometric systems. Chromatography methods separate and concentrate different chemical …
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Influence of Operational Characterization Methods on DOM Physicochemical Properties and Reactivity with Aqueous Chlorine
The physicochemical properties and chemical reactivity of dissolved organic matter (DOM) are of tremendous practical significance in both natural and engineered aquatic and terrestrial systems. DOM is frequently extracted, fractionated, and concentrated from environmental samples using a variety of …
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Multiphysics modeling, study, and analysis of atmospheric pressure plasma-based mass separation system for high-level radioactive waste treatment
… only 0.1% of the radioactivity. Therefore, clean separation as a group of elements may significantly reduce the HLRW storage volume and maintenance cost. In the case of Spent Fuel (SF), over 95% of the mass is transuranium elements, and only 4–5% is fission products. Here, a clean mass group …
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RECYCLING OF PRECIOUS METALS FROM WASTE PRINTED CIRCUIT BOARDS VIA A COMBINATION OF PYRO AND HYDROMETALLURGICAL PROCESSES
… from waste PCBs. Typically, mechanical separation is the initial step, followed by leaching and chemical separation to further isolate and process the metals. The primary goal of this project was to extract precious metals (Au and Pd) from waste PCBs through various chemical reagents. …
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Feasibility Study of Minor Actinide Transmutation In Light-Water Reactors With Various Am/Cm Separation Efficiencies
… in a typical light water reactor. Due to similar chemical properties of americium and curium and the difficulty associated with their chemical separation, the separation efficiency of these two elements was also considered. Three separation efficiencies for the MA content were considered, and …
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Chemical Reactivity and Regioselectivity of Trimetallic Nitride Endohedral Metallofullerenes
… This dissertation addresses the chemical reactivity and regioselectivity of TNT EMFs. Based on the extraordinarily high stability of TNT EMFs relative to empty cage fullerenes and classic endohedral metallofullerenes, macroscopic quantities of high purity TNT EMFs were obtained …
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Reactivity and Chemical Characterization of Dissolved Organic Matter in an Estuary
… data to quantify the changes of major chemical compound classes in high molecular weight (HMW, >1kDa) DOM isolated along a transect from Great Dismal Swamp through the Elizabeth River/Chesapeake Bay system to the coastal Atlantic Ocean off Virginia, USA. Results show that both …
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Investigation of ThO2 as a structural analogue for spent nuclear fuel dissolution under repository conditions
… the analysed 229Th concentration. However, the chemical separation needed before alpha spectrometry is very time consuming compared to the sample preparation necessary for HR-ICP-MS. When combined with simulations, direct alpha analysis confirmed that during leaching a new layer, with a maximum …
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