JSS2 Third Term Basic Science Lesson Note – Products of Fractional Distillation

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WEEK EIGHT

TOPIC: CRUDE OIL AND PETROCHEMICALS

CONTENT: PRODUCTS OF FRACTIONAL DISTILLATION

The distillation process is carried out by heating crude oil to a high temperature. The crude oil changes to vapour and ascends the fractional column. As the vapour ascends the column, it cools, condenses and separates into its fractions. The fractions with lower boiling points separate out on the trays in the upper part of the column, while fractions with higher boiling points separate out in the trays in the lower part of the column.

During the separation of crude oil three stages are involved, separation, conversion and purification. Separation is the first stage where the fractions are splitted by heat. Conversion is the conversion of less useful fractions into more useful ones through thermal cracking or polymerization. Purification is the removal of impurities.

Crude oil fractionates

1 Natural gas: This is a mixture of gases like methane, butane and ethane use as cooking gas.

2 Petrol (Gasoline): Petrol is a mixture of volatile liquids. Volatile liquids quickly change into gas.

3 Kerosene: It is a mixture of fairly volatile liquids.

4 Gas oil and diesel oil: These are also liquid mixtures of heavy hydrocarbons.

5 Lubricating oils and grease: These are heavy and viscous liquid mixtures of hydrocarbon. Viscous liquids are thick and sticky.

6 Bitumen and other residues: These are solid remains from fractional distillation of crude oil.

USES OF CRUDE OIL

Crude oil can be exported (or sold) to foreign countries. When refined, its products have a wide range of uses, namely:

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