Introduction: In the process of gas absorption, a mixture of gases is contacted with a liquid, for the purpose of dissolving one or more components of the gas and to provide a solution of them into the liquid. In this, a gas phase consisting of CO2 and air is introduced into the bottom of the packed column. Adjustment of their flow ratio is obtained by manual valves. Asample of the gas mixture is sent to a CO2 concentration sensor located inside the electric console, and readings of flows and percentage CO2 concentration is visible on the display screen as well as in the software. For the liquid phase, water (or a solution of sodium hydroxide) is pumped to the top of the column where it falls through the packing material. The gas and liquid phase flows counter currently.

Specifications: An apparatus for teaching the principles of the absorption of gas into liquid, using a packed column.Column working length is 1.4m x 80mm diameter, split into two sections.Two electronic pressure sensors measure the pressure drop across each half of the column.An electronically controlled submersible pump provides a liquid flow of 1-10 l/min u 60l feed tank.Water flow can be used in either recycle or one-pass operation.Column supplied with 10mm x 10mm Raschig rings as packing material, total volume 7l. Other sizes can be used.Centrifugal fan provides air flow up to 160 l/min.Two electronic temperature sensors measure the air and liquid temperatures.Electronic measurement of CO2 concentration in the air streams, measurements can be taken at the column inlet and outlet.Sensor values displayed on an alphanumeric display on the control console.