Unit operations Distillation

What is the effect of pressure in the Distillation Operation? It is also said that when the vapor pressure of the liquid component equals the atmospheric pressure, boiling occurs; can anyone give me an example for this type of Distillation?

Thank you

Questions by Affwan Hassan   answers by Affwan Hassan

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akash savsani

  • Jul 13th, 2011

If pressure increases then the quantity of distillate get less and if we decrease the pressure then the quantity of vapor increases but if the difference in boiling point is less than bottom product also goes to distillate and we get impure product

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  • Jul 15th, 2011

The higher the pressure the lower the cooling rate

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  • Sep 3rd, 2011

If we increase the pressure, the no. of stages in a distillation column becomes less as the liquid boils earlier (boiling occurs when the atmospheric pressure becomes equal to the vapour pressure of the liquid.)

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Sina Salimi

  • May 30th, 2016

Increasing pressure makes separation harder, because it decreases relative volatility

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