Topic
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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TL;DR: In this paper, a solution of PDMS-coated SiO2 and adhesives dissolved in hexane, cotton and kapok surfaces were modified to achieve high repellency towards water with a water contact angle exceeding 150°.
72 citations
TL;DR: The aim of this study was to select alternative solvent to hexane such as ethanol or isopropanol, and, to adjust the oil extraction process by developing an ultrasound assisted method to reach a comparable efficiency but also to enhance the oil quality.
72 citations
01 Jul 2009
TL;DR: In this article, a heterogeneous base-catalyzed transesterification has been proposed using CaO. Parametric study has been conducted and the optimal conditions were found to be: methanol/oil mass ratio 0.5:1; catalyst amount 6 wt.%, and reaction temperature of 65°C.
Abstract: Oil-laden spent bleaching clay (SBC) is currently under-utilized by dumping it in landfills without any attempt to recover the oil. Therefore, effort has been made to extract the waste oil using different solvents (methanol, ethanol, petroleum ether, and hexane), and utilize the oil in transesterification reaction. Cleaner oil (free from polar components and least acid content) of 28.2 ± 0.6 wt.%, a significant amount susceptible to be converted to biodiesel, was extracted using non-polar solvent. However, the relatively high free fatty acid content leads to yield loss through saponification under homogeneous base-catalyzed reaction. As such, in the present work, heterogeneous base-catalyzed transesterification has been proposed using CaO. Parametric study has been conducted and the optimal conditions was found to be: methanol/oil mass ratio 0.5:1; catalyst amount 6 wt.%, and reaction temperature of 65°C. The highest purity of 98.6 ± 0.8 % was achieved within 2.5 h. Biodiesel yield under the solid catalyst was quantified as 90.4% as compared to 45.5% and 61.0%, respectively for classical NaOH, and KOH homogeneous catalysts.
72 citations
TL;DR: There are very small variations in lambda max for all four carotenoids between hexane and methanol, due to differences in molar extinction coefficients.
72 citations
TL;DR: In this article, a commercial solution of free Candida antarctica lipase B (Novozyme 525L) has been immobilized by adsorption onto 12 different silica supports modified with specific side chains (e.g. alkyl, amino, carboxylic, nitrile, etc.).
Abstract: A commercial solution of free Candida antarctica lipase B (Novozyme 525L) has been immobilized by adsorption onto 12 different silica supports modified with specific side chains (e.g. alkyl, amino, carboxylic, nitrile, etc.). The immobilized derivatives were assayed for the kinetic resolution of rac -1-phenylethanol in both ionic liquid/hexane and ionic liquid/supercritical carbon dioxide biphasic media. The best results were obtained for the supports modified with non-functionalized alkyl chains and when the in water activity increased from 0.33 to 0.90 (e.g. the CALB/butyl-silica activity was enhanced up to five times). Coating immobilized enzyme particles with ionic liquids (butyltrimethylammonium bistriflimide or trioctylmethylammoniun bistriflimide) resulted in a decrease in activity (10 times), although half-life times were enhanced (up to six times) in hexane media at 95 °C. However, immobilized derivatives coated with ionic liquids clearly improved their synthetic activity in supercritical CO 2 by up to six times with respect to the hexane medium, which agrees with the “philicity” between alkyl chain lengths of both the silica support and the cation of ionic liquid.
72 citations