A schematic diagram of the stirred cell absorber is shown in Figure 2. The stirred cell absorber comprises an inner diameter 12.5 cm chamber with a water jacket which is connected to a water bath.
Deionised water is used in the double jacket to provide isothermal operating conditions. The entire assembly was proven to have no leak.
The gas phase stirrers were two fan turbines with six blades each mounted in the gas phase while the liquid phase stirrer with two blades placed halfway dow depth.
Both the gas and liquid phase stirrers were driven by the same shaft at speeds 0 - 2500 rpm that can be adjusted electronically within an accuracy of ± 1 rpm.
Eight baffles inside the reactor are designed to prevent vortex formation during the stirring of the liquid phase and also to ensure a flat horizontal interface.
A pressure transducer (Druck, PTX1400, U.K., 0-100kPa abs.) with accuracy 0.15%, was mounted on the flange and coupled with a data acquisition system to record the total pressure inside the reactor.
A metal pipe with 10 cm3 volume was used for storage gas. It was wound around the metal flange which was temperature controlled by an independent controller based on an electric heater.
This equipment unit is used to provide the required temperature for the gas.
Both the upper and bottom metal flanges and the storage gas pipe are thermally insulated to improve the accuracy of the temperature control.