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Showing 1 to 12 of 12 for “"Theoretical plates"”.
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Evaluation of solvents for extraction of acetic acid from aqueous solutions
… of selected solvent systems on the basis of: (a) theoretical transfer units required for extraction, (b) in the case of solvents boiling below 100 °C, theoretical plates required for distillation of extracts, and (c) heat required for recovery of pure acetic acid and of solvent.
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A Fast-Response Odor Chromatographic Sniffer (FOX)
… microfabricated columns, achieving up to 8300 theoretical plates per meter for naphthalene using 1-butylpyridinum bis(trifluoromethylsulfonyl)imide [BPY][NTf2] at 240°C. The development of portable systems for fuel adulteration detection is demonstrated, capable of discriminating 5% kerosene …
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Microfabrication and Evaluation of Planar Thin-Film Microfluidic Devices
… amino acids and obtain efficiencies of over 2500 theoretical plates. Through the addition of commercially available electroosmotic flow reducing coatings, I have been able to improve the separation of these amino acids, decreasing the run time by approximately 6 fold and increasing the efficiency …
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Comparative Performance of Two Domestic Spirit Stills
… treatment than that of the T500 still. The mean theoretical plates value of the T500 was 5.08, which was higher than that of the essencia still (4.92). The gas chromatograph (GC) results of the distillates fractions from a 15% synthetic wash containing seven congeners showed essencia’s recovery …
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Microchip Liquid Chromatography and Capillary Electrophoresis Separations in Multilayer Microdevices
… microchip column with an efficiency of 3300 theoretical plates. Improved electrode designs that eliminate the stochastic formation of bubbles on the electrode surface will enhance pumping reproducibility. Multilayer polymeric microdevices having fluidically and electrically independent …
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Polymer Microchips for Capillary Electrophoresis and Electric Field Gradient Focusing of Biomolecules
… in ~10 s, with peak efficiencies of 43,000 theoretical plates. Electric field gradient focusing (EFGF), which uses a combination of pressure-driven flow and an electric field gradient to separate charged species according to their electrophoretic mobilities, was explored for protein …
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Adiabatic Packed Column Supercritical Fluid Chromatography
… lose efficiency (>25% decrease in the number of theoretical plates) at outlet pressures below 140 bar in a forced air (non-adiabatic) thermal environment. The minimum outlet pressure was decreased to 120 bar in a traditional isothermal still air (near-adiabatic) column heater and to 100 bar in …
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Bioreaction and separation in preparative batch chromatographic columns : the hydrology of lactose to yield glucose,galactose and oligosaccharides
… This was shown by an increase in the number of theoretical plates (N) from about 500 to about 3000 for a 2 metre long CBRS, coupled with higher resolution. A simple experiment with the 1 metre column showed that combined bioreaction and separation was achievable in this system. Having improved …
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The extraction of analytes from aqueous solution using supercritical fluids
… as well as an increase of 10% in the number of theoretical plates of the system. On-line SFE\SFC was explored as one possible configuration for the extraction of analytes from aqueous solution. Solvent elimination injection (SEI), was developed for SFC. The difference in vapor pressure between …
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A problem driven approach to the miniaturizsation and automation of enzyme-based assays and an investigation of the dissipation of cyanazine and bromide in wetland mesocosms
… good limits of detection, sensitivities, or high theoretical plates satisfactory for pharmaceutical companies. As thousands of combinatorial libraries queue up for analysis, speed and sample throughput have become increasingly important. Joining drug companies are hundreds of superfund sites, with …
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Determination of nicotine and its metabolites by capillary electrophoresis and mass spectrometry.
… But with its high resolution and high number of theoretical plates achieved, CE makes for an attractive separating device for coupling with a mass spectrometer (MS). The overall aims of this work were to produce a sensitive, highly selective, and simple CE-sample stacking/MS assay for the …
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Gas chromatography on self assembled single walled carbon nanotubes
… the column efficiency demonstrated around 1000 theoretical plates/in, comparable to commercial GC columns. Evaluation of Van't Hoff and Van deemter plots suggested that the CNTs followed classical chromatography behavior. Comparison of capacity factors (k') and isosteric heats of adsorption …