The temperatures in a fractionating tower at an oil refinery are important, but so are the pressures. Where mi?

And the answer is greater at the bottom of the fractionation tower but I need an explantion.The temperatures in a fractionating tower at an oil refinery are important, but so are the pressures. Where mi?
In a simple fractionator you are separating two components. One is has a higher boiling point than the other. For this reason the lower boiling point component evaporates first and moves toward the top of the tower where it is condensed. The high boiling point component remains at the bottom of the column.





If you want more detail about reflux, reboilers, etc. Look at the site below.The temperatures in a fractionating tower at an oil refinery are important, but so are the pressures. Where mi?
During operation of the fractionating column, the vapors a flowing from the bottom of the column to the top of the column, with the column trays helping to give theoretical stages of separation by allowing vapor / liquid contact. The fact that there is a flow means that there needs to be a force behind that flow. The force is pressure. Most distillation column designs in industry include differential pressure gauges to indicate the boil-up or total vapor flow in the column.





The pressure is higher at the bottom of the column.