Absorption is used to remove one or more gaseous components from a gas stream using a solvent. First, a mixture of CO 2 gas and air is produced. It is possible to adjust the mixing ratio with valves. The flow rates of the gas components are shown. A compressor delivers the gas mixture into the lower section of the absorption column. In the column, part of the CO 2 is separated in the counterflow with the solvent. Water is used as a solvent. CO 2 is absorbed by water flowing downward. To remove the absorbed CO 2 , the loaded water is then fed from the lower section of the absorption column to a desorption column. As the pressure is reduced and the temperature is increased, the solubility of CO 2 decreases. A heater heats the water. A water jet pump generates a negative pressure in the desorption column and causes CO 2 gas to be emitted from the water.

Code: CE 400