How is crude oil separated

• 1)Crude oil?

  Is first vapourised in a furnace
• 2) Mixture of?

  Liquid and vapour passes into a tower that is cooler at the top than the bottoms
• 3) Vapor pass?

  Up the tower via a series of trays containing bubble caps until it arrives at a tray that is cool, they then condense to liquid
• 4) Mixture of liquids?

  That condenses is piped off
• 5) Heavy fractions?

  Have a higher boiling point and condense near the bottom of the column
• 6) Lighter hydrocarbons?

  Condense in trays nearer to the top of the tower where it is cooler because they have lower boiling points