The fractions have to be then treated to remove impurities like organic compounds that contain sulphur, nitrogen, oxygen, water, dissolved metals and inorganic salts. The fractions are passed through either sulphuric acid (to remove unsaturated hydrocarbons with C=C double bonds, nitrogen compounds, oxygen compounds and residuals), an absorption column full of drying agents to remove water, or sulphur treatment and hydrogen sulphide to remove sulphur and other sulphur compounds.
The fractions are then cooled and blended to make products such as petrol with or without additives, lubricating oils and kerosene of varying grades, jet fuel, diesel fuel, heating oil and chemicals of varying grades for making plastics and other polymers, which are used to make plastic bags, toys, diapers and many more products we use every day.
