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The kinetics of the extraction of cobalt in a growing drop cellGolshekan, H. R. January 1986 (has links)
No description available.
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The mechanism of action of azoneBeastall, J. C. January 1987 (has links)
No description available.
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Thermal and energetic analysis of a naturally ventilated reversible windowLeal, Vítor Manuel da Silva January 2005 (has links)
Tese de doutoramento. Ciências de Engenharia. Faculdade de Engenharia. Universidade do Porto. 2005
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An improved solvent extraction of onion oilHernandez-Molinar, Ernesto 21 October 1981 (has links)
A simple process to obtain onion oil by direct solvent extraction
was proposed. Several solvents commonly utilized in the food
industry were tested for their selectivity in the extraction of the
oil of onion. Diethyl ether and methylene chloride appeared to be
the most suitable solvents for the extraction operation. The direct
solvent extraction method produced a yield of onion oil approximately
seven times higher than the yield obtained by the steaim distillation
method.
A process of fermentation of the ground raw onions was used
prior to the solvent extraction operation. This produced an improvement
in the onion oil yield of 60% over the normal solvent extraction
method.
In order to determine the quality of the onion oil obtained, refractive
index, specific gravity, melting point, and sulfur content
were determined. Sulfur content in the onion oil obtained by the
method proposed here had one-third (weight basis) of the sulfur content
of commercial onion oil.
Two organoleptic evaluations were conducted for commercial onion
oil and for the onion oil obtained by direct solvent extraction: odor
threshold determination and comparative flavor evaluation. The commercial
onion oil showed a lower threshold concentration (1.6 ppb)
than the onion oil obtained in the laboratory (8.4 ppb). With respect
to the comparative flavor tests, the test panels did not detect a
statistically significant difference between the flavor of commercial
onion oil and the oil obtained by the method proposed here. / Graduation date: 1982
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Modelling of solvent extraction of coalFigueroa, Diana C Unknown Date
No description available.
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Direct copper production from a loaded chelating extractant (an alkylated 8-hydroxyquinoline) by pressure hydrogen strippingDemopoulos, G. p. (George Pan). January 1981 (has links)
A novel technique of direct copper precipitation from a loaded chelating extractant using hydrogen in an autoclave (pressure hydrogen stripping) was studied. In its simplest form, the reaction is given by / {CuL(,2)}(,org) + H(,2)(g) (--->) 2{HL}(,org) + Cu(s). / Kelex 100 (Sherex Chemical Co. - commercial solvent extraction reagent), an alkylated derivative of 8-hydroxyquinoline was used as the basis of the present investigation and represents HL in the above equation. / Two types of experiments were carried out: (a) those designed to study the chemical and thermal response of the extractant at high temperature and hydrogen pressures and (b) those which describe the chemistry and kinetics of hydrogen stripping. / The extractant was found to exhibit excellent chemical stability up to 573 K (300(DEGREES)C) and 2.76 MPa (400 psi) hydrogen in the absence of copper. Its chemical stability was somewhat reduced when loaded with copper. In the latter case, some limited hydrogenation of the quinoline nucleus of the extractant and some of the impurities present (furoquinolines) was observed. The chemical stability of the extractant was found to be enhanced when at least 0.52 M of a long-chain alcohol (decanol) was added to the organic solvent (0.4 M Kelex/kerosene). A slow thermal dissociation of the copper chelate was found to take place within the experimental temperature range studied (443 to 488 K). This resulted in copper precipitation and organic regeneration. / Copper in a powder form was found to precipitate rapidly from loaded Kelex 100/decanol/kerosene solvents by reaction with hydrogen at pressures between 0.52 and 4.00 MPa (75 and 580 psi) and temperatures from 443 to 488 K (170 to 215(DEGREES)C). The overall process has heterogeneous characteristics. Nuclei are provided through slow thermal dissociation of the copper chelate. The freshly produced metallic copper, acting autocatalytically accelerates the precipitation kinetics. Reduction of the Cu(II) chelate to Cu(I) complex appears to be the rate controlling step. / In addition to temperature and pressure, the effects of seeding, agitation, copper concentration, ligand concentration and copper chelate age were investigated. Some physical and chemical properties of the copper powder product were also determined.
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Electrochemical uranium valence control in centrifugal solvent extraction contractorsPschirer, David M. 08 1900 (has links)
No description available.
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Molecular interactions in polar solventsChoi, Kwansik 12 1900 (has links)
No description available.
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Gibbsite growth mechanism and influence of the aqueous phase for synthetic Bayer liquors /Counter, James A. Unknown Date (has links)
Thesis (PhD)--University of South Australia, 1997
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Bacterial coagulation by a chlorinated solvent /Blackwell, Richard Lee, January 1965 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute, 1965. / Vita. Abstract. Includes bibliographical references (leaves 34-36). Also available via the Internet.
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