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Pressure is an important part in distillation because boiling points of different components to be separated depends on pressure, for normal distillation pressure is kept as 1 atmosphere but for components with high boiling points instead of rasing the temperature pressure is lowered till the vapor pressure of the components to be separated, hence the temperature to be raised becomes less, for example in vaccum distillation.

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16y ago
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12y ago

Pressure is a critical factor in normal distillation. As the pressure is increased, the temperatures throughout the column will also increase and visa versa. Low pressures are often used to the separation of chemicals that are sensitive to high temperatures. High pressures are used to reduce the cooling requirements in the condenser. The pressure in a distillation column also has an effect on the vapor flow within the distillation column, as the pressure increases the vapor flow decreases.

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