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Showing 1 to 20 of 52 for “"packed column"”.
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Simulation of packed column jigging
Packed column jig has been demonstrated a number of promising results in processing iron ore, coal, chromite and other finely disseminated particulate materials. The packing materials in the jig divide the column into a large number of virtual cells. Each cell performs the similar separation …
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Adiabatic Packed Column Supercritical Fluid Chromatography
… the fluid does not match the temperature of the column surroundings, a radial temperature gradient forms due to heat transfer between the column and the thermal environment surrounding the column. This radial temperature gradient causes a radial fluid density profile inside the column and radial …
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Generation of microbubble foam using a packed column
… foams from a dilute surfactant solution using a column packed with millimeter sized glass beads is examined. The investigation requires the fabrication of a test unit capable of producing microbubble foam at 40 L/min and design and fabrication of a packed bed device. The work also introduces an …
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Separation of Colloidal Particles in a Packed Column using Depletion Forces
… dispersion of PS particles into the inlet of a packed bed of 0.5 mm silica collector beads. Prior to injection, a carrier fluid of either KCl and KOH electrolyte or a silica nanoparticle dispersion was flowing through the column at steady state. When the carrier fluid was a dispersion of silica …
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Analysis of Alcohol and Alkylphenol Polyethers via Packed Column Supercritical Fluid Chromatography
… SFC-UV as well as normal phase HPLC-UV employing packed columns. Stationary phase and column length were varied in the SFC setup to produce the most favorable separation conditions. Fractions from SFC runs of APEOs were collected and analyzed by flow injection analysis electrospray ionization mass …
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The mechanism of liquid phase resistance to gas absorption in a packed column
Thesis: Sc. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 1960
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Impact of modified carbon dioxide mobile phases on detection on packed-column supercritical fluid chromatography
… be utilized, both have found widespread use in packed-column SFC. Unfortunately, the activity of the stationary phase of packed-columns may prevent the elution of moderately polar analytes when using 100% carbon dioxide. The stationary phase activity can usually be overcome by adding a modifier …
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Evaluation of mass transfer correlations for packed column air stripping of volatile organic contaminants from water supplies
The application of packed column air stripping systems to the removal of volatile organic contaminants (VOCs) from drinking water sources was investigated. The crucial element for the design of such systems exists in obtaining accurate predictions of mass transfer rates. The first phase of this …
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The evaluation of an argon and helium highly efficient microwave induced plasma as an element selective detector for packed column super critical fluid chromatography
… analysis of compounds that co-elute from a column because the detector is element-specific. The evaluation of the high efficiency microwave induced plasma (HEMIP) as an elemental selective detector for packed column supercritical fluid chromatography has been explored in this dissertation. …
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Comparison of packed and wide-bore, open-tubular gas chromatographic columns
Wide-bore, fused-silica capillary columns can be an excellent replacement for packed columns in many cases. They can provide higher surface inertness and thermal stability, as well as higher efficiency or speed of analysis. Wide-bore, open-tubular (WBOT) columns with thick films have higher sample …
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Supercritical Fluid Chromatography with Chemiluminescent Nitrogen and Sulfur Detection
… of the research investigated the CLND for packed column SFC with methanol modified CO2. The only modification made in the CLND for packed column SFC is the pyrolysis furnace. The CLND and UV were used to interface with SFC via a post-column split. Methanol-modified CO2 was also demonstrated …
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Characterization of a Novel Biodegradable Material to Reduce Emission of Ammonia
… cob and its adsorption capacity was studied by packed column and titration method. The packed column studies showed that the maximum absorption capacities of the raw corn cob (RCC) and the steam exploded corn cob (SECC) were 10.45 mg NHB3B/gRCC and 59.80 mg NHB3B/gSECC respectively. However, the …
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Fourier transform infrared spectrometric detection of chromatographic effluents: instrumental and methodological improvements using a flow cell interface
… both normal-phase and reversed-phase, and packed-column Supercritical Fluid Chromatography (SFC). Normal phase HPLC-FTIR was demonstrated on not only analytical scale columns, but semi-preparative and microbore scales as well. Significant advantages, particularly with respect to the low …
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ΜΕΛΕΤΗ ΤΗΣ ΑΥΘΟΡΜΗΤΗΣ ΗΛΕΚΤΡΟΧΗΜΙΚΗΣ ΑΠΟΘΕΣΗΣ ΙΟΝΤΩΝ ΜΟΛΥΒΔΟΥ ΑΠΟ ΥΔΑΤΙΚΑ ΔΙΑΛΥΜΑΤΑ ΣΕ ΣΙΔΗΡΟ ΚΑΙ Η ΣΗΜΑΣΙΑ ΤΗΣ ΣΤΗΝ ΕΠΕΞΕΡΓΑΣΙΑ ΥΓΡΩΝ Β...
… POWDER IN A STIRRED VESSEL AND AN IRON-SPHERE PACKED COLUMN). VARIOUS EXPERIMENTAL PARAMETERS WHICH INFLUENCE LEAD-ION REMOVAL WERE EXAMINED BOTH BY BATCH AND CONTINUOUS EXPERIMENTS. OPTIMUM CONDITIONS FOR LEAD REMOVAL AND MINIMUM EXCESS IRON CONSUMPTION WERE FOUND.EXPERIMENTAL RESULTS WERE …
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Supercritical fluid chromatography of nitrogen-containing compounds on packed columns
… supercritical CO₂ and 1% methanol modified CO₂. Packed columns with the following stationary phases were employed: silica, octadecyl (C₁₈), propylamino (NH₂), and polystyrene-divinyl benzene (PRP). Without modifier the range of basicities which could be eluted increased in the order of silica < …
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A multiwavelength detector and hydrodynamic chromatography system for the determination of particle size and size distribution
… solute particles interact as they pass through a packed column. In the past the interpretation of these chromatograms has been based upon the mathematical modeling of the column parameters. We have developed a new multiwavelength detector system to be used in conjunction with hydrodynamic …
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Fine particle flotation for Florida dolomitic phosphate pebbles
… liter stirrer-tank flotation cell and 2-in ID packed flotation column aiming at achieving a phosphate concentrate containing more than 30% P2O 5 and less than 1.0% MgO contents at high P2O5 recovery.;The characteristics of fatty acid collector, FA-12 and a newly developed PA-31 collector were …
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Strategies for the analytical determination of thermally labile sulfur-containing environmental pollutants
… (SCD), was successfully interfaced to both packed column supercritical fluid chromatography (SFC) and microcolumn high performance liquid chromatography (micro-HPLC). The packed column SFC/SCD system was shown to be compatible with both pure CO₂ and methanolmodified CO₂ mobile phases with a …
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Characterization and optimization of supercritical fluid chromatography with on-line Fourier transform infrared detection
… Transform Infrared (FTIR) spectrometer to a packed column (analytical scale) SFC is demonstrated. Characterization of mobile phases for SFC-FTIR is presented. Also, parameters for the optimization of spectral sensitivity, such as mobile phase transparency and flow cell design, are discussed. …
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Aspects of the microwave induced plasma as an element selective detector for supercritical fluid chromatography and supercritical fluid extraction
The introduction of supercritical CO₂ at packed column supercritical fluid chromatography (SFC) flow rates is shown to significantly affect the excitation characteristics of a helium microwave induced plasma (He MIP). In this work, the influence of CO₂ on specific atomic and ionic transitions of …
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