crude oil is made up of hydrocarbons. A hydro carbon is made up of hydrogen atoms and carbon atoms.
diiferent hydrocarbons have different boiling points. this means it can be seperated using fractions.
the column has a temperature gradient, which makes it hotter at the bottom.
fractions with low boiling points (gas) leaves at the top.
fractions with high boiling points stay at the bottom ( bitumen)
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