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: Molecular simulations of n-alkanes absorbed from a bulk solvent into narrow carbon nanotubes stand in difference to standard interpretations of the hydrophobic effect, which posit that the attraction between non-polar species in water is driven by their mutual insolubility.
Abstract: While alkanes in solution exhibit predominantly extended conformations, nanoscale confinement of these chains within protein binding sites and synthetic receptors can significantly alter the conformer distribution. As a simple model for the effect of confinement on the conformation, we report molecular simulations of n-alkanes absorbed from a bulk solvent into narrow carbon nanotubes. We observe that confinement of butane, hexane, and tetracosane induces a trans to gauche conformational redistribution. Moreover, confined hexane and tetracosane exhibit cooperative interactions between neighboring dihedral angles, which promote a helical gauche conformation for the portions of the chain within the nanotube. Hexane absorbed into the nanotube from water or benzene exhibits essentially the same conformation regardless of the bulk solvent. The PMF between the nanotube and hexane along the central nanotube axis finds that nanotube absorption is favorable from aqueous solution but neutral from benzene. The interaction between hexane and the nanotube in water is dominated by the direct interaction between the alkane and the nanotube and weakly opposed by indirect water-mediated forces. In benzene, however, the direct alkane/nanotube interaction is effectively balanced by the indirect benzene-mediated interaction. Our simulations in water stand in difference to standard interpretations of the hydrophobic effect, which posit that the attraction between non-polar species in water is driven by their mutual insolubility.
22 citations
TL;DR: The solubility of luteolin in methanol, ethanol, 1-propanol, 2-Propanol and 2-pro-panol were measured at T = (273.15, 283.15 and 298.15) K.
Abstract: The solubilities of luteolin in methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, acetone, hexane, and dimethyl sulfoxide (DMSO) at T = (273.15, 283.15, 298.15, 313.15, and 333.15) K were measured. The solubility of luteolin increases with increasing temperature, but there was no correlation with the number of carbon in the solvents. The nonideal solution model and an empirical equation were used to correlate the solid−liquid equilibrium data.
22 citations
TL;DR: In this paper, the physicochemical properties of gurum seed oil obtained from supercritical CO₂, screw pressing, and hexane extraction were studied, and the results showed that the highest yield of lipids was obtained by the hexane extractor (34.04%) as compared to supercritical co-partitioning (30.05%) and screw pressing (27.5%), respectively.
Abstract: Lipid composition, physicochemical, antioxidant, and thermal properties of gurum seed oil obtained from supercritical CO₂, screw pressing and hexane extraction were studied. Results showed that the highest yield of lipids was obtained by the hexane extraction (34.04%) as compared to supercritical CO₂ (30.05%) and screw pressing (27.5%), respectively. The physicochemical properties of oil extracted by different methods are important criteria to select the oil for edible purpose. Supercritical CO₂ gurum oil has higher linoleic acid composition in comparison to the screw press gurum oil and hexane gurum oil. Supercritical CO₂ gurum oil and hexane gurum oil showed lower free fatty acid values (0.60 and 0.46%, respectively). Supercritical CO₂ gurum oil has shown higher amounts of (C18:1‐C18:1‐C18:2)‐TAG. Supercritical CO₂ gurum oil has excellent properties, especially in the terms of polyphenol, β‐tocopherol, ergosta‐7, 22‐dein‐3‐ol, and antioxidant activity. Thus, suggesting the supercritical CO₂ gurum oil as desired alternative for extracting fats with altitude nutritional value, while keeping bioactive compounds intact. PRACTICAL APPLICATIONS: This study is beneficial for extraction of oil from seeds. Supercritical CO₂ fluid extraction (SFE) is quite demanding technique on the industrial scale. SFE is a novel method to extract the oil from gurum seed and can be used in various fields such as food and pharmaceutical industries. The presented results revealed that gurum seed oil extracted by SFE could be the desired alternative for extracting fats with altitude nutritional values while keeping intact healthier bioactive compounds for wellbeing of human health.
22 citations
TL;DR: In this paper, the selective oxidation of n-hexane to secondary alcohols and ketones has been carried out with hydrogen peroxide using TS-2, a titanium silicate molecular sieve as the catalyst.
22 citations
TL;DR: In this article, the activity and selectivity of Ni/MgO catalysts in pre-reforming of n -hexane with steam (S/C, 1.5-3.5) in absence and presence of H 2 (H 2, 2) was investigated.
Abstract: The activity–stability pattern of a 19 wt.% Ni/MgO catalyst in the pre-reforming ( T , 450 °C; P , 10 bar) of n -hexane with steam (S/C, 1.5–3.5) in absence and presence of H 2 (H/C, 2) has been investigated. Deactivation profiles of the kinetics of CH 4 and CO/CO 2 formation indicate that the activity, selectivity and stability are closely related. Hydrogenation of carbon species to methane is a critical step involving the occurrence of coking in the pre-reforming of hexane. Thermodynamic analysis of the outlet reaction stream signals that the net coking rate depends upon the relative kinetics of carbon methanation (MET, C+2H 2 ⇄CH 4 ) and gasification/water–gas-shift (GAS, C+H 2 O⇄H 2 +CO; WGS, CO+H 2 O⇄CO 2 +H 2 ) reactions, while negligible appears the contribution of the Bouduard reaction path (DISP, 2CO⇄C+CO 2 ).
22 citations