Heptane, properties, and chemical reactions.
Heptane, C7H16 – organic substance class alkanes. In nature, found in natural gas extracted from gas and gas condensate fields in oil and gas, in oil.
The heptane – organic substance class alkanes, consisting of seven carbon atoms and sixteen hydrogen atoms.
The chemical formula of heptane C7H16. Has eleven isomers, including two optical isomers: n-heptane (normal heptane), 2-methylhexan, 3-methylhexan, 2,2-dimethylpentane, 2,3-dimethylpentane, 2,4-dimethylpentane, 3,3-dimethylpentane, 3-ethylpentane, 2,2,3-trimethylbutane.
– n-heptane H3C-CH2-CH2-CH2-CH2-CH2-CH3,
– 2-methylhexane H3C-CH(CH3)-CH2-CH2-CH2-CH3,
– 3-methylhexane H3C-CH2-CH(CH3)-CH2-CH2-CH3,
– 2,2-dimethylpentane of (H3C)3-C-CH2-CH2-CH3,
– 2,3-dimethylpentane of (H3C)2-CH-CH(CH3)-CH2-CH3,
– 2,4-dimethylpentane (H3C)2-CH-CH2-CH-(CH3)2,
– 3,3-dimethylpentane of H3C-CH2-C(CH3)2-CH2-CH3,
– 3-ethylpentane H3C-CH2-CH(CH2CH3)-CH2-CH3,
– 2,2,3-of trimethylbutane (H3C)3-C-CH(CH3)-CH3.
3-methylhexane and 2,3-dimethylpentane have right and left optical isomers.
The structure of the molecule n-heptane:
All isomers heptane is a colorless liquid with a pungent odor.
In nature, found in natural gasextracted from gas and gas condensate fields in oil and gasin oil. Also contained in shale oil, shale gas.
Flammable and explosive.
Not soluble in water. Soluble in organic substances (acetone, benzene, chloroform, diethyl ether, etc.).
Toxic. Heptane has a narcotic irritant. The fourth class of danger.
|The smell||with a pungent odor|
|Aggregate state (at 20 °C and atmospheric pressure of 1 ATM.)||liquid|
|The density of n-heptane (at 20 °C and atmospheric pressure of 1 ATM.) kg/m3||683,8|
|The density of n-heptane (at 0 °C and atmospheric pressure of 1 ATM.) kg/m3||700,4|
|The melting point of n-heptane, °C||-90,61|
|The boiling point of n-heptane, °C||98,42|
|The ignition temperature of n-heptane, °C||223|
|The flash point of n-heptane, °C||-4|
|Critical temperature of n-heptane, °C||267,01|
|The critical pressure of n-heptane, MPa||Of 2.74|
|Explosive concentration of gas mixture n-heptane with air, % by volume||1.06-6,7|
|Specific heat of combustion of n-heptane, MJ/kg||45,105|
|Molar mass, g/mol||100,21|
|Name:||Boiling point:||Octane number:|
|heptane (n-heptane)||98,42 °C||0|
|2.2-dimethylpentan||Close of 79.20 °C||93|
|3.3 to dimethylpentan||86,06 °C||84|
Chemical properties of heptane are similar to properties of other representatives of a number of alkanes. So it is characterized by the same chemical reaction.
Cm. Chemical properties of butane.
N-heptane is used in the determination of the knock resistance of gasoline fuels. Its octane number is by definition equal to 0.
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