Equipment Selection

  • Packed towers usually will be less expensive than plate towers when the tower diameter is less than about 0.75 m. For larger diameter towers, the choice must be justified on the basis of detailed cost comparisons.

  • In packed towers at any time, small amount of liquid is retained. This is generally an advantage, since it decreases the load on the tower and removes liquid from the tower as rapidly as possible. In some cases it may be a disadvantage, especially where the reaction between the gas and liquid is slow, or where the solubility of the gas in the liquid is not great.

  • Packed towers offer low pressure drop compared to tray column.

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