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Heptane

About: Heptane is a research topic. Over the lifetime, 5215 publications have been published within this topic receiving 82493 citations.


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Journal ArticleDOI
TL;DR: The procedure allows the determination of the fatty acid composition of lipids from tissues containing high proportions of triacylglycerols (oil seeds), water (leaves), or both (oil fruits).

557 citations

Journal ArticleDOI
TL;DR: By using the linear free energy solvation approach and the descriptors found for 12 solutes, the BMIM-PF6 solvent parameters were calculated for the ionic liquid/water and ionic Liquid/heptane biphasic systems and the regression parameters show a low basicity of the BM IM-PF 6 solvent compared to octanol.
Abstract: 1-Butyl-3-methylimidazolium hexafluorophosphate (BMIM-PF6) was synthesized and purified to be used as a ionic liquid solvent. Its physicochemical properties were studied. The ionic liquid/water (P il/water) and ionic liquid/heptane (P il/heptane) distribution coefficients of a set of 40 compounds with various functionalities, including organic acids, organic bases, amino acids, antioxidants, and neutral compounds, were measured using liquid chromatography. For ionizable compounds, the P il/water values measured at pH 2, 5.1, and 10 were very different. These allowed the determination of both the molecular Poil/water values and the ion P−il/water value for each compound. These coefficients were compared to the corresponding P oct/water coefficients. Marked differences in the partitioning behavior of basic, acidic, and neutral compounds were observed. The relationship between P il/water and P oct/water is different from that reported previously. By using the linear free energy solvation approach and the descriptors found for 12 solutes, the BMIM-PF6 solvent parameters were calculated for the ionic liquid/water and ionic liquid/heptane biphasic systems. The regression parameters show a low basicity of the BMIM-PF6 solvent compared to octanol. The high cohesion of the ions in the ionic liquid phase is also indicated by the regression equations obtained. Ionized phenols (phenoxide ions) associate more strongly with BMIM-PF6 than most other ionized molecules. Amino acids were not soluble in ionic liquid; however, it is possible to extract them partially by adding a crown ether to the ionic liquid phase and working at pH 1. The positive form of amino acids is complexed by the crown ether and the complex is extracted in the ionic liquid phase.

487 citations

Journal ArticleDOI
TL;DR: In this paper, small-angle neutron scattering (SANS) was performed on solutions of asphaltene fractions in mixtures of heptane and toluene with added resins to determine aggregate sizes.

379 citations

Journal ArticleDOI
Se-Na Kim1, Jun Kim1, Hyun-Chul Kim1, Hye-Young Cho1, Wha-Seung Ahn1 
TL;DR: In this article, a Ti-incorporated metal organic framework structure, MIL-125, and its amine functionalized form, NH2-MIL-125 were synthesized via a solvothermal route aided by microwave heating.

378 citations

Journal ArticleDOI
TL;DR: The results of this study strongly supports the theory that asphaltenes are the most effective in stabilizing emulsions when they are near the point of incipient precipitation and points to the significance of the solubility state of the asphaltones in determining the emulsifying potential of these crude oils.

374 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023127
2022252
202195
2020105
201990
2018100