Hexane

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hexane

[′hek‚sān]
(organic chemistry)
C6H14 Water-insoluble, toxic, flammable, colorless liquid with faint aroma; forms include: n-hexane, a straight-chain compound boiling at 68.7°C and used as a solvent, paint diluent, alcohol denaturant, and polymerization-reaction medium; isohexane, a mixture of hexane isomers boiling at 54-61°C and used as a solvent and freezing-point depressant; and neohexane.

Hexane

 

(n-hexane), the saturated hydrocarbon C6H14; a colorless liquid. Boiling point, 69°C; density, 0.660 g/cm3 (20°C); refractive index (Hexane), 1.37506.

In view of its low octane number (25), hexane is an undesirable constituent of synthetic gasoline. Hexane is present in considerable quantities in straight-run gasoline and in the cracking distillates of petroleum. Under the conditions of petroleum product aromatization and catalytic reforming, hexane is dehydrocyclized to benzene. The hexane isomers 2,2-dimethylbutane and 2,3-dimethylbutane (diisopropyl) are additives improving the quality of motor fuels.

References in periodicals archive ?
The fraction V3 (2.8 g) obtained from the main column with n-hexane: ethyl acetate (6: 4) was further subjected to silica gel column to give compound 2 (19 mg) and 8 (17 mg) when eluted with n-hexane: ethyl acetate (5: 5).
Initially, the PCDDs from spiked grain samples were extracted through 1:1 n-hexane:acetone mixture.
The reaction mixture (2 mL) consisted of 1 mL of test sample (methanol extract, water, ethyl acetate, chloroform, and n-hexane fractions) and 1 mL of 10% RBC suspension; instead of test sample only saline was added to the control test tube.
The extract was fractioned with various solvents in order of increasing polarity, starting with the least polar solvent, n-hexane followed by chloroform, ethyl acetate and n-butanol.
As shown Table 4, Zingiber officinale Rosc (Khing) exhibited antioxidant activities with the range of 1.10 to 2.23 mg/mL in n-hexane, chloroform, and butanol extracts.
Fucoxanthin content was analyzed using HPLC in ethanolic extract, n-hexane, ethyl acetate and ethanolic fraction of Turbinaria decurrens.
Figure (5b, 5c) showed heterogeneous, porous surface morphology of Fe-doped TiO2 nanoparticles synthesized in acetonitrile and n-hexane.
Among them, A2 exhibited high antioxidant activity and A3 also had relatively high antioxidant activity; therefore, second fractionation of A2 and purification of A3 by HPLC were performed by silica-gel semipreparative column (Wakosil 5SIL, Wako Chemicals Co.), eluted with n-hexane and ethyl acetate (50% : 50%), and A2 gave four compounds based on peaks: AS1 (2.5 mg), AS2 (2.9 mg), AS3 (3.5 mg), and AS4 (5.2 mg), and A3 gave single compound (2 mg).
When n-hexane and ethyl acetate were used as solvents, respectively, the inverted micelle phases immediately separated (within 1 hour) into micelle-poor and micelle-rich phases that formed densely packed aggregates, and most micelles were destroyed (Figure 2) as n-hexane has lower polarity (polarity index = 0.1) and ethyl acetate higher solubility in water (8.7 g/100mL) than chloroform (polarity index = 4.1 and solubility in water = 0.81 g/100mL).
The isolating process of FFAs was conducted in separatory funnel using n-hexane as solvent to extract FFAs and residual glycerides.
A mass of 160 g of powdered plant material was subjected to a serial exhaustive extraction using the maceration method in 3000 ml of n-hexane, dichloromethane, methanol, and water (starting with less polar to more polar solvent).
atrophaeus was susceptible to all the extracts except n-hexane. Against B.