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Showing 1 to 20 of 218 for “"Hexane."”.
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The separation of hexane from polybutadiene
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1981.
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Novel platinum/KL catalysts for the aromatization of N-hexane.
Finally, regeneration of Pt/KL catalysts was studied for sulfur poisoned catalysts. While air effectively burned off coke deposits, sintering of Pt resulted. An oxychlorination treatment effectively redispersed the Pt.
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HEXANE : architecting manned space exploration missions beyond low-earth orbit
With the end of the Space Shuttle Program and the cancellation of the Constellation Program, NASA's long-term designs for manned spaceflight beyond Earth orbit remain indefinite. Although progress has been made in plans for operations on orbit, the capabilities gap for manned spaceflight beyond …
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The deactivation of Zeolite-Y and mordenite during hexane cracking and propene oligomerisation
… pore structures and acid site distributions. Hexane cracking at 1 atmosphere and high pressure propene oligomerisation provided two different reaction types. The transport properties of the catalysts were compared by measuring adsorption and diffusion using the GC technique with ancillary …
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Application of Taylor Dispersion Technique to Measure Molecular Diffusion Coefficient of Hexane-Bitumen System
… to find molecular diffusion coefficients in hexane-bitumen system. For the first time, the infinite dilution molecular diffusion coefficients of bitumen in hexane were measured in both cases of presence and relative absence of asphaltene particles in the solution. As the first result, …
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Experimental and modeling analysis of n-hexane, 2,3 dimethylbutane and cyclohexane: implications for SOFC operation
Includes bibliographical references (pages 181-186).
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Aromatization of n-hexane by platinum containing molecular sieves and distribution and motion of organic guest molecules in zeolites
… tested as catalysts for the aromatization of n-hexane at 460 - 510°C and atmospheric total pressure in order to study the influence of Pt cluster size and support acidity/basicity, microstructure and chemical composition on activity and selectivity. High selectivity to benzene over most of the …
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The mechanism of hydrolysis of triphenylsilyl fluorides in water-acetone solutions and the mechanism of decarboxylation of β-ketoacids in water, benzene, and hexane
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 1951
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Anticancer activity of Lovage (Levisticum officinale Koch) extracts
… line (PNT2A, prostate epithelial cells). The n-hexane, ethyl acetate, methanol and methanol/water crude extracts of Lovage roots were prepared and tested for cytotoxicity using a resazurin metabolic indicator assay. The most cytotoxic extract was the hexane, followed by the ethyl acetate, while …
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ΠΡΟΣΔΙΟΡΙΣΜΟΣ ΧΛΩΡΙΩΜΕΝΩΝ ΥΔΡΟΓΟΝΑΝΘΡΑΚΩΝ ΣΕ ΟΡΓΑΝΙΣΜΟΥΣ
… OR BY BINDING IT TO ANHYDRONSSODIUM SULPHATE. 2) HEXANE EXTRACTION FOR 13 HOURS. 3) REMOVAL OF LIPIDS ON A COLUMN OF ALUMINA HEATED AT 800 C, WITH 5% ADDED WATER. 4) PRELIMINARY SEPARATION OF THE CONSTITUENTS ON A 4X580 MM SILICA GEL COLUMN WITH 16-20% ADDED WATER.THE ELUTION SOLVENT IS FIRST …
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An investigation of direct C-alkylation of 2,4-oxazolidinedione and 5-phenyl-2,4-oxazolidinedione utilizing dialkali salt intermediates
… using lithium diisopropylamide in THF-hexane-HMPA was only 39% (determined by pmr analysis), the addition of HMPA as a co-solvent had a beneficial effect on the ratio of 5-phenyl-2,4-oxazolidinedione to the benzyl derivative. The addition of HMPA as a co-solvent in the ethylation of …
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ΠΑΡΑΓΩΓΗ ΑΙΘΥΛΕΝΙΟΥ ΜΕ ΚΑΤΑΛΥΤΙΚΗ ΑΤΜΟΠΥΡΟΛΥΣΗ Κ-ΕΞΑΝΙΟΥ
… PRESENCE OF CATALYSTS VIA STEAM CRACKING OF N-HEXANE. VARIOUS TYPES OF CATALYSTS WERE PREPAREDAND TESTED IN AN EXPERIMENTAL PYROLYSIS UNIT. THE CATALYST SAMPLE WITH THE COMPOSITION 12CAO7AL2O3 SHOWED THE HIGHEST SELECTIVITY IN RELATION TO ETHYLENE PRODUCTION. THE EFFECT OF CALCINATION …
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Characterization of pyrolysis products from end-of-life electronic equipment
… 30min and 45min). Tetrahydrofuran (THF) and hexane are used as solvents to separate the non-gaseous products which are partitioned into THF-Insoluble, THF-Soluble Hexane-Insoluble and Hexane-Solubles while the gaseous products are analyzed using a gas chromatograph (GC). (Abstract shortened …
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Design of organic Rankine cycles for conversion of waste heat in a polygeneration plant
… are considered, with a particular focus on hexane, heptane, octane, nonane, and decane. Hexane is the best option for the Fischer Tropsch heat source and the working fluids considered here. A set of ORC design concepts (building blocks) is developed to allow a cycle to be matched to a …
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Determination of Extractables from Cranberry Seeds Using Supercritical CO₂
… have been compared with Soxhlet extractables (hexane) to evaluate the feasibility of SFE as an alternative extraction method. The extractables obtained via hexane and SF CO₂, which were derivatized and identified by gas chromatography mass spectrometry (GC-MS), contained mostly methylated fatty …
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Thermal and chemical analysis of carbonaceous materials: diesel soot and diesel fuel reactor deposits
… performed using GC-MS analysis. Five solvents (hexane, cyclohexane, toluene, methanol and acetone) were compared with dichloromethane, the most extensively used solvent for the extraction of soot with respect to their ability to extract a variety of species, including polyaromatic hydrocarbons …
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Substratselektivität von Lipasen bei der Veresterung und Umesterung cis-trans-isomerer Fettsäuren und Fettsäureester
… elaidic acid respectively) with n-butanol in n-hexane. While most of the lipases were unspecific towards the isomeric 9-octadecenoic acids, lipases from Candida cylindracea and Mucor miehei had a strong preference for the cis-9-isomer and catalysed the esterification of oleic acid 3-4 times …
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In vitro anti-platelet aggregation activity of the extracts of bulbine natalensis
… plant material was extracted sequentially using hexane, chloroform, ethyl acetate, methanol, and water. The chloroform extract had the highest yield of 0.20%. Phytochemical screening revealed the presence of anthraquinones, cardiac glycosides, saponins, tannins, flavonoids and alkaloids. The …
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The separation of specific enantiomers of anticancer reagent cytarabine using HPLC.
… column using mobile phase ratios consisting of n-hexane: 2-propanol (50:50, v/v), (60:40, v/v) (70:30, v/v) at a flow rate 1.5ml/min and n-hexane: 2-propanol: diethylamine (50:50:0.2, v/v/v) and (60:40:0.2, v/v/v) at flow rate 1ml/min with excessive overlap. The application of the Chiralcel OJ-H …
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Fundamental phenomenological description and experimental optimization of gel stabilized biocatalysts in a two-phase system
… calcium-alginate hydrogel before been placed in hexane in order to catalyse the esterification of butanol and propionic acid. The consequence of the acidification of the aqueous phase lead to the evolution of the calcium-alginate network to an alginic acid one with a size reduction of the spheres …
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