Absorption is one method that has been used extensively in industry to remove soluble
compounds from one fluid stream into another usually in a counter current vertical column
(Perry and Green, 2008). Gas absorption occurs when the impurity in the gas is absorbed into a
liquid stream. The opposite operation, where an impurity is removed from the liquid phase to
the gas phase, is known as stripping (Perry and Green, 2008). Similar to distillation, absorption
and stripping columns are designed by maximizing the amount of contact time and surface
between the gas and liquid phases. This is usually achieved through the use of some form of
random or structured packing. Ultimately the amount of impurities transferred between phases
depends highly on the vapor‐liquid phase equilibrium at certain temperatures and composition
conditions (Perry and Green, 2008). This vapor‐liquid equilibrium data, usually measured on
some lab‐scale apparatus, ultimately dictates the absorption column capacity and performance.
One use of a gas absorption column is the removal of CO2 from air using water as the liquid
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