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CE 400

Gas Absorption

Technical Description

Absorption involves separating one or more gas 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 by rotameters.
A compressor delivers the gas mixture into the lower section of the packed column. In the column, part of the CO₂ is separated in the countercurrent with the solvent. Water is used as the solvent. The CO₂ is absorbed by the downward flowing water and the charged water is then fed from the lower section of the column into a collecting tank. To separate the absorbed CO₂, the charged water is delivered from the collecting tank into a vacuum tank. As the pressure is reduced, the solubility of the CO₂ falls causing the CO₂gas to be emitted from the water. A centrifugal pump then delivers the regenerated solvent back into the collecting tank. From there, it is delivered back to the upper section of the column by a further centrifugal pump.

The two-section column is equipped with measuring connections to determine the pressure losses. The pressure loss in the respective sections can be displayed via 2 U-tube manometers. To evaluate the success of the process, the system includes outlets for taking gas and liquid samples. The gas samples can be analysed using the hand-held measuring unit supplied.
The well-structured instructional material sets out the technological fundamentals and provides a step-by-step guide through the measurements and experiments.

Learning Objectives / Experiments

- Investigation of the absorption process when

separating gas mixtures in a packed column
- Determination of pressure losses in the column
- Detemination of flooding point
- Representation of the absorption process in an

operating diagram
- Investigation of the variables influencing the

effectiveness of absorption
- Mass balance
- Determination of material transition data

(HTU, NTU)

Features

* Separating a CO₂/air mixture by absorption in

countercurrent₁
* DURAN glass packed column with Raschig rings₁
* Reliable operation due to use of water as the solvent

and non-hazardous gases₁
* Regeneration of solvent by vacuum₁
* Gas analysis with hand-held unit

Alternative products

RT 681 -- Test Stand for Level / Pressure Control

Specification

[1] Separation of CO₂/air mixture by absorption in countercurrent with water
[2] Production of gas mixture using CO₂ from compressed gas cylinder and ambient air
[3] Adjustment of mixing ratio using valves
[4] DURAN glass packed column with Raschig rings and stainless steel flanges
[5] Plastic collecting tank for solvent with absorbed CO₂
[6] Continuous solvent regeneration in circuit with vacuum tank
[7] Water jet pump for generation of vacuum
[8] Centrifugal pumps for regeneration circuit and returning solvent to column
[9] Rotary vane compressor for delivering the gas mixture into the column
[10] Hand-held measuring unit for gas analysis
[11] Temperature, pressure and differential pressure measurement

Technical Data

Packed column:
- height: 1560mm, internal diameter: 80mm
2 centrifugal pumps:
- max. flow rate: 18L/min
- max. head: 50m
Rotary vane compressor:
- max. positive pressure: 1bar
- max. flow rate: 8mł/h (at 50Hz)
Water jet pump: final vacuum: approx. 16mbar
Flow meter:
- CO₂: 0.4...5.4L/min
- air: 12...162L/min

- solvent: 0...600L/h
Tanks: collecting tank: 50L, vacuum tank: 5L

Dimensions and Weight

l x w x h : 950 x 750 x 2380 mm
Weight : approx. 180 kg

Connections

230V, 50/60Hz, 1 phase or 120V, 50/60Hz, 1 phase
CO₂ gas cylinder with pressure reducer,
Water connection: 250L/h

Scope of Delivery

1 gas absorption system
1 hand-held measuring unit for gas analysis
1 set of instructional material

Order Details

083.40000 CE 400 Gas Absorption