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In the industry , it's important to maintain the column pressure control in the distillation column .

" Pressure alterations will alter column vapour loads and temperature profiles. . So when using Temperature control as a substitute for composition control, pressure compensation is essential to achieve a desired composition . "

"Pressure variations change relative volatiles and affect fractionation process. " From this , I understand that if pressure acting upwards on the vapour is lesser than the pressure acting downwards , then it will affect the fractionation process.

But I do not understand the top part - " " Pressure alterations will alter column vapour loads and temperature profiles. . So when using Temperature control as a substitute for composition control, pressure compensation is essential to achieve a desired composition . "

Why does it link to temperature ? And in conclusion , I'm confused about how pressure is maintained in the distillation column and for what for .

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    $\begingroup$ things heat up when you apply pressure to them and cool down when you reduce pressure; I suggest that you take a look at the ideal gas law $\endgroup$ – CoffeeIsLife May 31 '17 at 8:00
  • $\begingroup$ The most common way to vary pressure in distillation is with a vacuum pump. $\endgroup$ – CoffeeIsLife May 31 '17 at 8:01

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