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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 chemical composition of both commercial and pilot scale supercritical carbon dioxide (SC-CO2) processed WGO was examined, and it was shown that the SCCO2 extraction method could eliminate the degumming step from edible oil refining processes.
Abstract: Wheat germ oil (WGO) is a specialty product with a very high nutritional value. The chemical composition of both commercial and pilot scale supercritical carbon dioxide (SC-CO2) processed WGO was examined. This study showed that methods used for oil extraction and refining did not have a significant effect on the fatty acid composition of the oil. SC-CO2 extracted oil had a higher tocopherol content than that of commercially hexane extracted oil. The phospholipid content of the SC-CO2 extracted oil was very low indicating that the SC-CO2 extraction method could eliminate the degumming step from edible oil refining processes. Although the conventional chemical oil refining technique reduced the tocopherol content of the WGO, it was possible to concentrate tocopherols in WGO by using physical refining methods such as molecular distillation.

108 citations

Journal ArticleDOI
TL;DR: In this article, the effects of different asphaltenes on heavy crude oil properties were evaluated by measuring the rheology of the solutions in tetralin at a wide range of temperatures.

107 citations

Journal ArticleDOI
TL;DR: In this paper, the authors aimed at screening solvent systems of varying polarities to identify suitable solvents for efficient and practical enzymatic glycerolysis, and found that the tertiary alcohols tert-butanol and tert-pentanol were the only pure solvers suitable for a fast reaction with an acceptably high formation of MAG.
Abstract: This study was aimed at screening solvent systems of varying polarities to identify suitable solvents for efficient and practical enzymatic glycerolysis. Several pure solvents and solvent mixtures were screened in a batch reaction system consisting of glycerol, sunflower oil, and Novozym® 435 lipase. Out of 13 solvents tested, tert-butanol and tert-pentanol were the only pure solvents suitable for a fast glycerolysis reaction with an acceptably high formation of MAG. In these systems, MAG contents of 68–82% were achieved within a few hours. Mixtures of tert-butanol/hexane, tert-pentanol/hexane, and tert-butanol/tert-pentanol in varying ratios also gave high MAG contents (58–78%). The tertiary alcohols tert-butanol and tert-pentanol, or mixtures of one of them with hexane, seemed to be the best choice among the solvents tested with respect to reaction efficiency, practical industrial applications, and steric hydroxyl group hindrance, which suppresses the ester formation with FA.

106 citations

01 Jan 2008
TL;DR: In this article, the effects of particle size, temperature and type of solvent on the extraction kinetic and thermodynamic parameters were studied and the maximum oil yields were 41.11% for ethanol and 44.29% for n-hexane at 50 o C.
Abstract: In this experiment, Neem oil extraction from Neem seeds (Azadirachta indica A. Juss) with n-hexane and ethanol are presented. Effects of particle size, temperature and type of solvent on the extraction kinetic and thermodynamic parameters were studied. Results showed that the maximum oil yields were 41.11% for ethanol and 44.29% for n-hexane at 50 o C, and 0.425-0.71 mm particle size. Based on psycho-chemical characteristics analysis showed that increasing temperature decreased iodine value but caused saponification, acid, and peroxide value became higher, which means higher extraction temperature result on higher oil yield but lower oil quality. The kinetic of neem oil extraction was derived from mass transfer rate equation. It also found that H ∆ is positive, S ∆ is positive, and G ∆ is negative indicating that this process are endotermic, irreversible, and spontaneous.

106 citations

Journal ArticleDOI
TL;DR: In this article, a molecular dynamics simulation of the interface between liquid hexane and liquid water has been performed, and the interface was found to be about 10 O(n) wide, which is inconsistent with the known solubility of hexane in water and is believed to be an artifact of the intermolecular potentials used.
Abstract: A molecular dynamics simulation of the interface between liquid hexane and liquid water has been performed. The sample consisted of a two-phase system comprising 187 hexanes and 1,200 waters, confined to a box measuring 83.19 {times} 30.1 {times} 30.1 A{sup 3}. A total of 94.4 ps was simulated (60 ps of equilibration and 34.4 ps of analysis). The interface was found to be about 10 {angstrom} wide. It does not appear to be molecularly sharp. A small number of hexane molecules are detached, i.e., completely surrounded by water. This is inconsistent with the known solubility of hexane in water and is believed to be an artifact of the intermolecular potentials used. Differences between the interfacial and bulk liquids were observed. Water is more structure in the interfacial region than in bulk, and hexane molecules in the interfacial region were found to exhibit an excess of trans conformations relative to bulk. Neither component displays any preferential orientation with respect to the lab frame.

104 citations


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