Spelling suggestions: "subject:"andeparation -- 1echnology"" "subject:"andeparation -- atechnology""
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Microfabricated continuous flow separation and manipulation systems for human whole bloodJung, Young Do 31 March 2010 (has links)
The objective of the research in this dissertation is to develop microsystem based separation technologies for whole cell cancer analysis using human whole blood as the input sample. This research work is carried out with two different approaches; one based on a miniaturized cascade magnetophoresis system and a second based on dielectrophoresis. The miniaturized systems can be fabricated using MEMS technologies combined with plastic fabrication techniques.
The design, fabrication, packaging, and characterization of several versions of the magnetophoresis and dielectrophoresis microsystems for whole cell cancer analysis in human whole blood sample are presented. The developed magnetophoresis systems have demonstrated improved throughput in the removal of RBC from a human whole blood sample and its application to the separation of tagged cancer cells based on their surface expression level of a specific protein. The dielectrophoresis microsystem has successfully shown the ability to steer a blood stream between two outlets and to separate WBCs or cancer cells from a human whole blood sample.
The developed microsystem based separation technologies can be further applied to the development of integrated system for cancer detection and treatments.
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Investigation of poly(pyrrolone-imide) materials for the olefin/paraffin separationBurns, Ryan Lance 28 August 2008 (has links)
Not available / text
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Membrane fouling of activated sludgeShi, Xinlong., 史昕龍. January 2004 (has links)
published_or_final_version / abstract / toc / Civil Engineering / Master / Master of Philosophy
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The separation of hexafluoropropylene and hexafluoropropylene oxide using toluene and a novel solvent.10 September 2010 (has links)
ABSTRACT
PELCHEM, the chemical division of NECSA, produces the fluorocarbon hexafluoropropylene (HFP) onsite.
In 2005 PELCHEM initiated research into the wet oxidation of HFP to produce the higher value
fluorocarbon hexafluoropropylene oxide (HFPO). Although successful in the conversion of HFP to HFPO,
the product stream contained both the product and the unreacted HFP. As a result, PELCHEM contracted
the Thermodynamics Research Unit at the University of KwaZulu-Natal to investigate the separation of
HFP and HFPO.
A solvent selection procedure was used to identifY potential solvents and an initial list of two hundred and
seven candidate solvents compiled. Utilising the UNIFAC group contribution method, the initial list was
narrowed down to thirty solvents using the criterion of selectivity at infinite dilution. Through the
comparison of specific solvent properties such as recoverability, safety, environmental factors and
economic considerations, a final list of ten solvents was generated. The list of ten solvents was proposed to
PELCHEM who identified four solvents for further studies. The work involving the two solvents, toluene
and hexafluoroethane (RI 16), is presented in this dissertation. The solvent toluene has been previously
used by the du Pont company for the separation of HFP and HFPO, while R116 is a novel solvent for this
application. The solvent selection procedure was performed in collaboration with a member of the
Thermodynamics Research Unit, and the work on the remaining two solvents is presented in the
dissertation of (Nelson 2008).
Experimental binary high pressure vapour liquid equilibrium data were measured for the HFP + toluene,
HFPO + toluene, R116 + HFP, and R116 + HFPO systems at two temperatures: 273.15 and 3 13.15 K. Pure
component vapour pressure data for HFPO in the temperature range of 271.90 to 318.20 K were also
measured. The HPVLE measurements were performed at the Thermodynamics Energy and Phase
Equilibria laboratories at Ecoles des Mines de Paris using two experimental techniques and equipment. The
binary systems involving toluene were measured on a static synthetic Pressure Volume Temperature
apparatus equipped with a variable volume cell. The binary systems involving RI16 were measured on a
static analytic apparatus equipped with a Rapid On-line Sampler Injector. None of the systems measured
for this project have been reported in the literature. The four binary systems and the pure component
vapour pressure measurements thus constitute new data sets.
All experimental data were modelled via the direct method using the computer software Thermopack.
Three model combinations were used to represent the data: the Peng-Robinson equation of state with the
Wong-Sandler mixing rules, the Peng-Robinson equation of state with the Modified-Huron-Vidal first
order mixing rules, and the Soave-Redlich-Kwong equation of state with the Wong-Sandler mixing rules.
The Mathias-Copeman alpha function was used in conjunction with the equation of state models, and the NRTL activity coefficient model was incorporated into the mixing rules. Due to time constraints,
experimental data for the binary system HFP + HFPO were not measured. Data for this system was
predicted at two temperatures, 273.15 and 313.15 K, via the PSRK-UNIFAC method. The critical line for
the supercritical systems R116 + HFP and R116 + HFPO were calculated in Thermopack.
PELCHEM required a commercial grade HFPO product stream of purity greater than 99 % (mole), and a
purified HFP product stream of purity greater than 95 % for the recycle and conversion of HFP into HFPO.
Using the regressed experimental high pressure vapour liquid equilibrium data, two preliminary separation
processes were designed in Aspen Plus to achieve these objectives. The first scheme involved toluene and
utilised the process of extractive distillation with toluene introduced as a liquid solvent. The toluene bonded
to the HFP and was removed as a bottoms product which allowed a purified HFPO stream to be recovered
as a distillate. The second scheme involved RI16 and utilised the process of gas stripping, with a liquid
mixture of HFP and HFPO contacted with a gaseous stream of R116. The R116 removed the HFP from the
liquid mixture, resulting in a purified HFPO stream. The toluene process resulted in an overall HFPO
product recovery of 98.46 % and HFPO product purity of99.88 % (mole). The RI16 process resulted in an
overall HFPO product recovery of96.57 % and HFPO product purity of99.71 %. For the component HFP,
the toluene process resulted in an overall HFP product recovery of 99.42 % and product purity of96.41 %.
The RI16 process resulted in an overall product recovery of99.36 % and product purity of93.45 %.
From a comparison of the preliminary design of the separation processes on the basis of patent issues,
performance, and other miscellaneous factors, it was concluded that the RI16 process compared favourably
to the process involving the solvent toluene. The preliminary process designs were presented to PELCHEM
in 2007, and pending further experimental work PELCHEM plans to patent the RI16 separation process. / Thesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2008.
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Separation of taxol and related taxanes using supercritical fluidsVandana, Vishnu 08 1900 (has links)
No description available.
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Cross-linkable polyimide blends for stable membranesSorensen, E. Todd 12 1900 (has links)
No description available.
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Design of solvent systems for supercritical fluid and high pressure applicationsHafner, Kellye Padgett 05 1900 (has links)
No description available.
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Demulsification of an industrial emulsion using microorganismsBelleau, Francine. January 1986 (has links)
No description available.
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Hydrogen selective properties of cesium-hydrogensulphate membranes.Meyer, Faiek. January 2006 (has links)
<p>Over the past 40 years, research pertaining to membrane technology has lead to the development of a wide range of applications including beverage production, water purification and the separation of dairy products. For the separation of gases, membrane technology is not as widely applied since the production of suitable gas separation membranes is far more challenging than the production of membranes for eg. water purification. Hydrogen is currently produced by recovery technologies incorporated in various chemical processes. Hydrogen is mainly sourced from fossil fuels via steam reformation and coal gasification. Special attention will be given to Underground Coal Gasification since it may be of great importance for the future of South Africa. The main aim of this study was to develop low temperature CsHSO4/SiO2 composite membranes that show significant Idea selectivity towards H2:CO2 and H2:CH4.</p>
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Development of conducting polymers for separationsReece, David Andrew. January 2003 (has links)
Thesis (Ph.D.)--University of Wollongong, 2003. / Typescript. Includes bibliographical references.
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