chem fractional distillation

• What happens to crude oil when it is heated?

  It evaporates.
• What occurs to the vapours of crude oil after it evaporates?


  The vapours move up the fractional column.
• How does the temperature change as the vapours move up the fractional column?

  It becomes cooler the further up the column.
• What happens to the gases as they move up the fractionating column?

  They cool down.
• At what condition does each fraction condense?


  At a different temperature.
• Where is each fraction collected in the fractionating column?


  At a different point.
• What do the fractions contain in terms of hydrocarbons?

  Hydrocarbons with a similar number of carbon atoms.
• What is the boiling point of refinery gases?


  Very low boiling points.
• What happens to refinery gases in the fractionating column?


  They do not condense and pass out of the top.
• What is the melting point of bitumen?


  Very high melting point.
• What happens to bitumen when the crude oil mixture is heated?


  It does not evaporate.
• Where is bitumen collected in the fractionating column?


  At the bottom of the fractionating column.