2. THEORETICAL FOUNDATIONS

2.3. Columns plates

Normally the operation of gas absorption, as in other basic operations, such as desorption and rectification, is carried out in the towers or columns which are similar in the case of a tower or absorption column filling. This columns are cylindrical bodies which are placed vertically. Inside you can find some devices, trays, plates. The main objective of these dishes is to provide a large contact surface between the two phases: the gaseous and liquid phase.

The plates are in contact with the liquid phase and gas in counter current. The transfer occurs due to concentration gradient and if there is no concentration gradient, then there can be no transfer of matter.

The design of the columns plates are based with the principles of the calculations for determining the number of theoretical plates to achieve a concentration determined from the gas absorption technique.

The use of columns plates are made in large-scale operations.

Features:

- Have a discontinuous contact with the gas.

- Large diameter gas.

- Used when there are suspended solids.

- Applies in cases where there are sudden temperature changes.

- Should be used when working with high pressures.