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Showing 1 to 20 of 60 for “"supercritical fluids"”.
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Nanoparticle formation and coating using supercritical fluids
… jet breakup and solvent evaporation into supercritical fluid (SC CO_2) is studied using high speed charged coupled device (CCD) camera facilitated with double shot particle image veloimetry (PIV) laser and a high pressure view cell. Particles formation using SAS is studied. …
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Precipitation polymerization and partitioning in supercritical fluids
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1987.
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Diffusion and mass transfer in supercritical fluids
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1985.
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The extraction of analytes from aqueous solution using supercritical fluids
Supercritical fluid extraction (SFE) is becoming an attractive alternative to conventional solvent extraction for many reasons. These reasons include advantages of speed, the ability to be automated more easily than conventional solvent extractions and the lack of solvent disposal after the …
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Optimal Analysis of Sulfonamides From Biological Matrices Using Supercritical Fluids
… the effect of temperature and pressure on the supercritical fluid extraction (SFE) of sulfonamides from a spiked sand matrix. Temperature effects were either positive or negative with respect to extraction rate and total recovery, depending on the pressure and extraction fluid employed. The …
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Supercritical Fluids: Kinetic Solvent Effect and the Correlation of Solid-Fluid Equilibria
… cyclopentadiene at 373, 378, 388, and 398 K in a supercritical propane solvent at pressures from 42 to 136 bar are presented. Data are presented for the cracking of dicyclopentadiene in supercritical butane at 433 K in the pressure range of 42-169 bar. Both reactions were studied in a …
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Removal of bitter substances from spent brewers yeast with supercritical fluids and entrainers
Includes bibliographical references.
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Correlation and prediction of solubility of low vapor pressure solids in supercritical fluids
Binary solubility data of hydrocarbon solids in supercritical fluids were correlated using the compressed gas model. Data included in the analysis were for solubilities of binary mixtures of napthalene, 2,3- and 2,6-dimethylnapthalene, benzoic acid, phenanthrene, anthracene and pyrene in both …
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Applications of supercritical fluids to the extraction and analysis of oligomers and polymer additives
Supercritical fluids (SF)s have several physicochemical properties that can often make them superior to conventional liquid solvents. These characteristics include relatively high densities, low viscosities, zero surface tension and high diffusivities. This unique combination of properties allows …
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Investigation into the quantitative aspects of supercritical fluids as mobile phases for chromatography and extraction
Supercritical fluids were introduced as mobile phases for chromatography and extractions in the early sixties. Over the past decade the technique has received increased attention, largely owing to the introduction of several commercial instruments and to the ease of adapting available commercial …
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Issues on Clean Diesel Combustion Technology Using Supercritical Fluids: Thermophysical Properties and Thermal Stability of Diesel Fuel
<p>The clean diesel combustion technology using supercritical fluids is aimed to both improve fuel economy and reduce harmful emissions. This novel process involves preparation, injection and combustion of supercritical fuel/diluents mixtures. Design and development of this new process require a …
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Analytical Perturbed Hard Sphere Models Based on Solubility and Volumetric Studies of Organic Solids Interacting With Supercritical Fluids
… would benefit enormously the modelling of the supercritical phase. An expression was derived that indicates the solubility data or gas chromatography data are not well suited for obtaining v(,2); therefore, a new experimental technique was designed. The solubility data were well correlated by …
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Supercritical Fluids: Measurement and Correlation Studies of Model Coal Compound Solubility and the Modeling of Solid-Liquid-Fluid Equilibria
… of model coal compounds have been measured in supercritical carbon dioxide, butane, ammonia, and ethanol utilizing dynamic flow apparatuses. The data base of supercritical solubilities has been extended to include solvents with higher critical temperatures than previously investigated. Studies …
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High-pressure viscosity and density of polymer solutions at the critical polymer concentration in near-critical and supercritical fluids
… of the viscosity of polymer solutions in dense fluids at the critical polymer concentration stems from the need to understand the factors that influence the time scale of phase separation in systems that undergo spinodal decomposition upon a pressure quench. In a recent investigation of PDMS + …
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Structural and Functional Effects in Solutions With Pure and Entrainer-Doped Supercritical Solvents
… of nonvolatile compounds in compressed supercritical fluids has been investigated. Within pure, nonpolar supercritical solvents the predominant factor determining solubility is the volatility of the solute at the solution temperature. Of secondary importance is the effect of solute size, …
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Measurement of binary phase equilibria and ternary/quaternary gas antisolvent (GAS) system measurement and analysis
… environmental impact of CO2 processing, GXLs and supercritical fluids (SCFs) have garnered a lot of attention for industry and academia. Supercritical fluids in this work refer to pure CO2 above its critical temperature and pressure.
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Forced convective heat transfer to supercritical water in micro-rocket cooling passages
An investigation of heat transfer to supercritical fluids in micro-channels was completed to assess the cooling characteristics of the MIT micro-rocket engine. Previous results from supercritical ethanol heat transfer tests were compared to water tests to establish a baseline for future fuel …
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Modelling and Simulation of Carbon Dioxide Transportation in Pipelines: Effects of Impurities
… are employed in the transportation of CO2. CO2 fluids contain impurities that affect the fluid properties and flow dynamics, but pipelines are mostly designed assuming that the CO2 fluid is pure. CO2 pipeline fluids contain at least 90 % CO2 with the balance made up of impurities. The impurities …
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Analysis of Ethoxyquin and its Oxidation Products using Supercritical Fluid Extraction and High Performance Liquid Chromatography with Chemiluminescent Nitrogen Detection
… part of this research investigates the use of supercritical fluids in the extraction of ethoxyquin from lean beef and beef fat. Supercritical fluids offer the advantages of safety, time, expense, and selectivity over liquid extractions. Three fluids were examined: carbon dioxide, …
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