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 98 for “"supercritical carbon dioxide"”.
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Supercritical Carbon Dioxide Extraction
… of this thesis is to explore the properties of supercritical carbon dioxide (CO<sub>2</sub>). In addition, the feasibility of building a small-scale low cost system will be explained. A supercritical fluid is a fluid which exhibits properties between liquid and gas with liquid like densities and …
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Solubility in supercritical carbon dioxide
… determination of the solubility of compounds in supercritical carbon dioxide are described. A comparative study is made of the methods used in the measurement of the concentration of benzoic acid and caffeine in supercritical carbon dioxide. The difference in measurement techniques did not have …
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Design of supercritical carbon dioxide centrifugal compressors
… años 60, especialmente el que emplea dióxido de carbono como fluido de trabajo, dada la facilidad de este fluido para ser enfriado con aire ambiente en condiciones todavía supercríticas (es decir, el ciclo es completamente supercrítico). Surgió así un ciclo propuesto por Feher en 1969 que …
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Removal of polymer coating with supercritical carbon dioxide
This work investigates the use of supercritical fluids, and carbon dioxide in particular, for the removal of polymer coatings. Research into new supercritical fluid applications is nearly always based on a trial and error approach, and frequently requires evaluating each operation on a case-by-case …
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Synthesis of polymeric nanocomposites in supercritical carbon dioxide
Supereritical carbon dioxide has been of great interest in various areas of chemical science and engineering during the last decade. In this thesis, the properties of poly (methyl methacrylate) (PMMA)/silica nanocomposites with different surfactant and filler concentrations synthesized through …
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Fish oil valorization using supercritical carbon dioxide technologies
… de pescado catalizada por lipasas en dióxido de carbono supercrítico (CO2-SC), centrándose en aspectos importantes de la reacción, como los efectos de la exposición al CO2-SC en varias lipasas, el equilibrio entre fases del sistema de reacción a altas presiones y la cinética de la reacción de …
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The drying of foods using supercritical carbon dioxide
… to such drying techniques, drying with supercritical carbon dioxide was investigated here. Initially, carrot was dried using this technique. Addition of a co-solvent (ethanol) to the supercritical fluid was used as a method to increase the water solubility in the supercritical fluid and …
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Thermal Management with Supercritical Carbon Dioxide under Extreme Applications
… system efficiency and reliability.</p> <p>Supercritical fluids, particularly supercritical carbon dioxide (sCO2), have received significant attention for various applications due to their unique thermodynamic properties near the critical point. By using sCO2 as a working fluid, systems can …
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Synthesis of fluorinated polymers in supercritical carbon dioxide (scCO₂)
… were carried out in homogeneous phase with supercritical CO₂. Polymerizations were carried out at 140°C, 1500 bar and were initiated with di-tert-butyl peroxide (DTBP). In-line FT-NIR (Fourier Transform- Near Infrared) spectroscopy showed that complete monomer conversion may be obtained. …
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Corrosion of various engineering alloys in supercritical carbon dioxide
… of ten engineering alloys were tested in a supercritical carbon dioxide (S-CO 2) environment for up to 3000 hours at 610°C and 20MPa. The purpose of this work was to evaluate each alloy as a potential candidate for use in the S-CO2 cooled next generation nuclear reactors. The alloys that …
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Control strategies for supercritical carbon dioxide power conversion systems
The supercritical carbon dioxide (S-C02) recompression cycle is a promising advanced power conversion cycle which couples well to numerous advanced nuclear reactor designs. This thesis investigates the dynamic simulation of, control strategies for, and selected transient results for an indirect …
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On the Local Heat Transfer Behavior of Supercritical Carbon Dioxide
… study of the local heat transfer behavior of supercritical carbon dioxide (sCO2) is performed. Flows relevant to heat transfer devices, such as sCO2 heaters, recuperators, and internally cooled turbine blades are studied, with particular attention paid to data reduction methodology, and the …
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The Manufacture of Polymer Nanocomposite Materials Using Supercritical Carbon Dioxide
The use of supercritical carbon dioxide (scCO₂) as a processing aid to help exfoliate nano-clays and improve their dispersion during melt blending in polymer matrices has been reported in the literature. One of the best processes in terms of improving the degree of nano-clay dispersion and …
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Thermodynamic Analysis and Optimization of Supercritical Carbon Dioxide Brayton Cycles
… the future electricity demand. To this end, supercritical carbon dioxide (S-CO2) Brayton cycles present great promise particularly in high temperature concentrated solar power (CSP) and waste heat recovery (WHR) applications. With this regard, this dissertation is intended to perform thorough …
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Soybean Oil Deacidification Using Membrane Separation and Supercritical Carbon Dioxide
… of soybean oil, oleic acid and linoleic acid in supercritical carbon dioxide provided the appropriate temperature and pressure conditions to use for the membrane separation. Data obtained from the solubility tests showed the best operational conditions in terms of temperature and pressure …
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A supercritical carbon dioxide cycle for next generation nuclear reactors
… constraints has been performed of the family of supercritical CO2 Brayton power cycles for application to advanced nuclear reactors. The recompression cycle is shown to excel with respect to simplicity, compactness, cost and thermal efficiency. The main advantage of the supercritical CO2 cycle is …
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Supercritical Carbon Dioxide Processing Of Nano - Clays And Polymer/clay Nanocomposites
… method that utilizes the unique properties of supercritical carbon dioxide (scCO2) to disperse nano-clay and prepare a series of polymer/clay nanocomposites with enhanced properties was explored.</p> <p>Significant dispersion was achieved using the scCO2 process with Cloisite 10A without the …
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Experimental assessment of the internal flow behavior of supercritical carbon dioxide
… assessment of the internal flow behavior of supercritical carbon dioxide. The investigation focused mainly on assessing condensation onset during rapid expansion of CO₂ into the two-phase region. An experimental blowdown test-rig with a modular test section was developed with the capability …
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