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Showing 1 to 18 of 18 for “"Vacuum Distillation"”.
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Purification of Cd, Zn and Te for CdZnTe growth
… (CdZnTe) crystal growth. Specifically, vacuum distillation, zone refining and H[subscript]2 gas flow assisted zone refining were all investigated as methods to purify the constituent elements of CdZnTe. A unique multi-chamber ampoule was used to enable a purification sequence starting …
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Mass Transfer Studies In A 'Finpak' Distillation Column
… of a new form of rectification device under vacuum distillation conditions.<br/><br/>The operating conditions were so varied as to not only provide a measure of 'Finpak' column efficiency under a variety of such conditions, but also to illustrate the effect such variables have on the overall …
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The influence of various molecular structures on the elimination maximum of fatty acids
The vacuum distillation of heat-sensitive substances such as organic oils, dyes, and drugs requires special equipment from that available for atmospheric distillation. Study in the resulting field, high vacuum distillation, has subsequently led to the development of such equipment. Three types of …
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Development of an Electrochemical Method to Investigate the Thermodynamic Behavior of Lanthanum and Sulfur in Liquid Steel
… is strongly required. In this study, I look at vacuum distillation of RE sulfide. The challenge is that thermodynamic data of RE sulfide of gas phase are insufficient. Therefore, I investigated the thermodynamic properties of gaseous rare earth compounds to evaluate the feasibility of vacuum …
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Desalination for Sustainable Water Production with an Emphasis on Low Pressure Distillation
… methods of desalination include filtration and distillation. This paper explores the potential energy savings of vacuum distillation for seawater desalination to reduce the amount of energy needed to achieve phase change.</p> <p>Depending on the vacuum boiler design, the vaporization mechanism …
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Studies in process integration of energy and environmental systems
… the energy recovery in petroleum refinery distillation systems via process integration. Chapter 3 presents an extension to a case study of heat integration of a vacuum distillation system. Chapter 4 describes the detailed synthesis, retrofit and optimization of HENs for a system of …
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Synthesis of Platinum Dirhenium Dodecacarbonyl and Its Use as a Catalyst Precursor (Bimetallic, Rhenium, Heterogeneous)
… dust and H(,3)PO(,4) in tetraglyme, followed by vacuum distillation. A single-crystal x-ray diffraction analysis of Re(,2)Pt(CO)(,12) shows that the molecule ideally possesses D(,2h) symmetry with octahedral coordination about each rhenium atom and square planar (trans) geometry about the …
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Characterisation and environmental effects of unresolved complex mixtures of hydrocarbons
… oil was characterised by a combination of micro vacuum-distillation and oxidative degradation. Vacuum-distillation produced six distillate cuts and a residue which were all highly unresolved by GC (ca. 951/6). The average molecular weight of each cut was determined by probe CIMS (310 - 440 …
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Direct liquefaction of coal with coal-derived solvents to produce precursors for carbon products
… The products were separated by filtration and vacuum distillation to produce three fractions, the THF insolubles, pitch, and recycle solvent. The coal-alone conversions were calculated for each hydrogenation reaction and the pitch fractions were characterized as possible carbon-product …
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Determinazione delle proprietà del petrolio tramite spettroscopia 1H-NMR e analisi chemiometrica
… oils, it is necessary to perform an atmospheric distillation and to characterize their fractions at laboratory level (crude assay). In order to characterize the crude residue, a vacuum distillation is needed and the physical-chemical properties of the resulting fractions must be measured. The …
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Pyrometallurgical Oxide-Sulfide Anion Exchange for Improved Material Separation and Metal Production
… to be amenable to metal production via simple vacuum thermal treatments. Aluminothermic reduction via reactive vacuum distillation is shown to enable manufacturing of a range of alloys from sulfide feedstocks without direct greenhouse gas emissions, including aluminum-manganese, aluminum …
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Synthesis of Higher Molecular Weight Poly(D-glucaramides) and Poly(aldaramides) as Novel Gel Forming Agents
… organic acid products was accomplished through vacuum distillation of the reaction mixture followed by filtration through either a diffusion dialysis unit or a nanofiltration system. While nanofiltration showed higher selectivity for separating nitrate, diffusion dialysis was capable of …
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Synthesis of Higher Molecular Weight Poly(D-glucaramides) and Poly(aldaramides) as Novel Gel Forming Agents
… organic acid products was accomplished through vacuum distillation of the reaction mixture followed by filtration through either a diffusion dialysis unit or a nanofiltration system. While nanofiltration showed higher selectivity for separating nitrate, diffusion dialysis was capable of …
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The redesign and reconstruction of a five-inch magnetically-driven centrifugal molecular still
Molecular or short-path distillation is one form of high vacuum distillation, and offers a means of separating heat-sensitive, high-boiling materials which cannot be separated by conventional methods. Many of the so-called "undistillables," which include the natural fats and waxes, sugar …
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Syntheses of Multi-headed, Two-tailed, Anionic Surfactants as Topical Microbicides
… monoalkylmalonate (RCH(COOEt)2) was separated by vacuum distillation and then used as the starting material of the dialkylation step. This modification improved the yields of this reaction by about 10 percent from the routine procedure of introducing both alkyl groups in the same reaction. The …
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Investigations on hydrodesulfurization reactions using slurry catalysts and supercritical water
… supply to less attractive heavier oil fractions. Vacuum residue, as the heaviest fraction found in crude oil and the bottom product of the vacuum distillation column in a refinery, has therefore been gaining more and more attention in the past years. It is mostly used as heavy fuel oil in the …
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A study of the mechanism of the thermal decomposition of 1-bromo-2-(1-naphthyl)naphthyl-carbinol and related diarylcarbinols
… these two reactions has been furnished by the vacuum distillation of secondary bromide 62. The attack of bromine atoms on the benzylic hydrogen atoms of ether 58 would give ether free radical 64 and hydrogen bromide gas. Homolysis of 64 would then give ketone 44 and secondary free radical 63. …
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Sex pheromone studies on the grass grub (Costelytra Zealandica (White)) and the common army worm
… component was isolated by the means of high vacuum distillation onto dry ice followed by gas chromatography. The isolated material was then examined by high resolution mass spectroscopy and found to be phenol. On average each female beetle at the time of mating contained about 1.5μg phenol. …