Features
Separating a CO2/air mixture by absorption in counter-flow
Glass column with packed bed
Safe operation due to use of water as the solvent and non-hazardous gases
Regeneration of solvent by vacuum
Gas analysis with hand-held measuring unit
Tesca Gas Absorption Unit is used to remove one or more gaseous components from a gas flow using a solvent.
First of all, a CO2 and air gas mixture is produced. It is possible to adjust the mixing ratio using valves. The flow rates of the gas components are displayed.
A compressor delivers the gas mixture into the lower section of the absorption column. In the column, part of the CO2 is separated in the counter-flow with the solvent. Water is used as the solvent. The CO2 is absorbed by the downward flowing water. To separate the absorbed CO2, the charged water is then fed from the lower section of the absorption column into a desorption column. As the pressure is reduced and the temperature is increased, the solubility of the CO2 falls. A heater heats the water. A water jet pump generates negative pressure in the desorption column and causes the CO2 gas to be emitted from the water. A pump then delivers the regenerated solvent back into the absorption column.
The water temperature can be controlled. Flow rate, temperature and pressure are continuously measured. The two-section column is equipped with connections to determine the pressure losses. The pressure loss in the respective sections can be displayed via two U-tube manometers. To evaluate the success of the process, the trainer includes outlets for taking gas and liquid samples. The gas samples can be analysed using the hand-held measuring unit supplied.

Specifications
Separation of CO2/air mixture by absorption in counter-flow with water
Production  of  gas  mixture  using  CO2  from compressed gas cylinder and ambient air
Adjustment of mixing ratio using valves
Compressor for delivering the gas mixture into the absorption column
Glass  absorption  column  (packed  bed)  and desorption column
Continuous solvent regeneration in circuit with desorption column under vacuum
1 pump for desorption column and 1 pump for returning solvent to absorption column
Water  temperature  control  with  heater  and refrigeration system

Technical Specifications
Absorption column
Height: 2x 750mm, internal diameter: 80mm
Desorption column
Height: 750mm, internal diameter: 80mm
2 pumps (absorption/desorption)
max. flow rate: 17,5L/min
max. head: 47m
1 pump (cooling)
max. flow rate: 29L/min
max. head: 1,4m
Compressor
max. positive pressure: 2bar
max. flow rate: 39L/min
Measuring ranges
Flow rate:
Ÿ Air: 0,2…2,4Nm³/h
Solvent: 50…600L/h
Ÿ CO2: 0,4…5,4L/min
Temperature: 1x 0…80°C, 2x 0…60°C
Pressure: 1x 0…2,5bar, 1x -1…0,6bar
Differential pressure: 2x 0…250mmWC
CO2-content: 0…100vol%

Experimental Capabilities
Investigation  of  the  absorption  process  when separating gas mixtures in a packed column
Determination of pressure losses in the column
Representation of the absorption process in an operating diagram investigation of the variables influencing the effectiveness of absorption

Required Services
Electric Supply 230 V AC, Single Phase, Earthed.
Water supply: 10L/min @ 1bar
CO2 Cylinder with pressure regulator
Vent piping to outside laboratory
Titration glassware for liquid analysis Separate drain tank for treatment of effluent