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Hexane

About: Hexane is a research topic. Over the lifetime, 3759 publications have been published within this topic receiving 57996 citations. The topic is also known as: CH3-[CH2]4-CH3 & hexyl hydride.


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Journal ArticleDOI
TL;DR: In this article, the main aim of the investigation was to extract oil from seeds of Mucuna in order to increase the concentration of l -Dopa in the defatted mucuna meal.
Abstract: The main aim of this investigation was to extract oil from seeds of Mucuna in order to increase the concentration of l -Dopa in the defatted Mucuna meal. Three different varieties of Mucuna ( aterrima , cinerium , deeringiana ) and solvents (supercritical carbon dioxide, dichloromethane, hexane) were used. The experiments under supercritical CO 2 conditions were performed in a laboratory scale unit at 40 and 60 °C over the pressure range from 150 to 250 bar. A constant flow rate of CO 2 close to 3 mL/min was always kept. The results revealed that temperature, pressure and density were important variables for CO 2 extraction. The concentration of l -Dopa in the defatted meal from supercritical fluid extraction was always higher than those without oil extraction or extracted using organic solvents. Quantitative and qualitative analyses of the oil extracted under the different investigated experimental conditions shown no significant differences in terms of fatty acid and free glycerol compounds. The same analyses indicated linoleic acid (omega-6) as the major oil component and a content of free fatty acids in the oil extracted with supercritical CO 2 close to 5%. The kinetics of oil extraction with CO 2 was also investigated at all the considered operating conditions.

47 citations

Journal ArticleDOI
TL;DR: The effect of platinum concentration on tungsten oxide-promoted zirconia over the catalytic activity for n-hexane isomerization was studied in this paper, where the n -hexane reaction was studied at 200°C, 5.9 bar, WHSV 4 and H 2 : nhexane (molar) ratio 7.05%.
Abstract: The effect of platinum concentration on tungsten oxide-promoted zirconia over the catalytic activity for n -hexane isomerization was studied. Catalysts were prepared by impregnation of tungsten oxide-promoted zirconia reaching up to 1.50% platinum, followed by calcination at 500°C. The n -hexane reaction was studied at 200°C, 5.9 bar, WHSV 4 and H 2 : n -hexane (molar) ratio 7. It was found that catalytic activity and stability increase for platinum concentrations above 0.05% because of higher hydrogen availability at the surface, measured as a function of the methylcyclopentane/C 6 isomers ratio. Further increments in platinum concentration do not produce important modifications in catalytic activity or hydrogen availability. Mechanical mixtures of Pt/SiO 2 and tungsten oxide-promoted zirconia present a lower conversion than platinum over tungsten oxide-promoted zirconia due to the larger distance between the acid and metallic functions.

47 citations

Journal ArticleDOI
TL;DR: In this article, the textural characterization of MCM-41 by hexane was employed and confirmed analyses using nitrogen as a probe whereas energetic parameters such as CBET were found to be dramatically low.

47 citations

Journal ArticleDOI
TL;DR: In this article, the results obtained on the preparation of hydrophobic silica aerogels by ambient pressure drying method using the sodium silicate precursor with the variation of solvent exchanging process, are reported.
Abstract: Experimental results obtained on the preparation of hydrophobic silica aerogels by ambient pressure drying method using the sodium silicate precursor with the variation of solvent exchanging process, are reported The silica hydrogel was prepared by passing the 112 specific gravity sodium silicate through the Amberlite (TM) 120 Na+ resin and addition of 1 M ammonium hydroxide to silicic acid The gel was kept in an oven for 3 h to strengthen the gel Solvent exchange was carried out with ethanol and hexane for 36 h each followed by 24 h silylation using 20% hexamethyldisilazane (HMDZ) in hexane Unreacted HMDZ was washed with hexane by keeping the gel in hexane for 24 h Solvent was decanted and the gel was dried for 24 h by keeping the gel at 50 °C for 6 h, at 150 °C for 12 h and at 200 °C for 6 h The low density (006 g/cm3), highly porous (969%), highly hydrophobic (contact angle of 160°), low thermal conductivity (007 W/m K) aerogels were obtained for the process of three times exchange with ethanol and three times exchange with hexane in 36 h each, followed by silylation with 20% HMDZ in hexane and two times washing with hexane in 24 h FTIR studies showed the increase in the intensity of the Si–H and C–H bands of the aerogels with the increase of solvent exchanging times because of increase in silylation for more times of solvent exchange processes It was found from the TG–DTA studies that the hydrophobicity of the aerogels retained up to the temperature of 325 °C Water absorption studies show that the aerogels were remained hydrophobic up to 4 months when the aerogels were placed over the water as well as for up to 60 h in a 90% humid atmosphere SEMs of the aerogels reveal that the pore sizes of the silica network increased, so the percentage of optical transparency decreased with the increase in exchange times with ethanol and hexane

46 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023205
2022429
202186
202092
201999
201891