What are the main uses of the fractions of crude oil?

Fraction: No. of carbon atoms: Uses:
Refinery gas 1 – 4 Gaseous fuel, making chemicals.
Gasoline (petrol) 4 – 12 Motor car fuel, making chemicals.
Kerosine (paraffin) 11 – 15 Heating fuel, jet fuel.
Diesel oil 15 – 19 Diesel fuel for lorries, trains, etc. and heating fuel.

What is gasoline fraction used for?

Fractional distillation is used to separate crude oil into simpler, more useful mixtures . This method can be used because different hydrocarbons have different boiling points .

What are the five fractions of crude oil?

Fractional distillation of crude oil

Fraction: No. of carbon atoms: Uses:
Refinery gas 1 – 4 Gaseous fuel, making chemicals.
Gasoline (petrol) 4 – 12 Motor car fuel, making chemicals.
Kerosine (paraffin) 11 – 15 Heating fuel, jet fuel.
Diesel oil 15 – 19 Diesel fuel for lorries, trains, etc. and heating fuel.

Are crude oil fractions pure?

Crude oil is a mixture of hydrocarbons . … The crude oil is evaporated and its vapours condense at different temperatures in the fractionating column. Each fraction contains hydrocarbon molecules with a similar number of carbon atoms and a similar range of boiling points.

Why is bitumen not used as fuel?

Bitumen itself is a black and very sticky liquid. It’s also highly viscous and so full of carbon that it cannot be used for combustion (unlike gasoline, diesel and jet fuel).

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Which fractions are the hardest to ignite?

For example, the bitumen fraction contains hydrocarbons with more than 35 carbon atoms. These have boiling points well above room temperature. They are very difficult to ignite and have a high viscosity (they flow with difficulty).

What are two conditions needed for cracking?

Thermal cracking uses harsh conditions like high temperature and high pressure. It breaks the alkanes into a high percentage of alkenes and comparatively few alkanes. Thermal cracking is done at about 1,000 degrees Celcius and 70 atm pressure.

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