Which fraction leaves at the top of the tower?
a) Refinery gases
b) Petrol
c) Fuel oil
d) Diesel
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correct answer is option number a) Refinery gases...
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a) Refinery gases
As the liquids run down the tower, the lighter hydrocarbons are fractioned out, leaving a heavier liquid. Each tray down the tower contains a heavier liquid.
Refinery gas is defined as non-condensable gas obtained during distillation of crude oil or treatment of oil products (e.g. cracking) in refineries. It consists mainly of hydrogen, methane, ethane and olefins. It includes gases which are returned from the petrochemical industry.
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