Manual Absorption Desorption Pilot Plant

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Product Code: APC014

Manual Absorption Desorption Pilot Plant Manufacturer

Manual Absorption  Desorption Pilot Plant

Main characteristics of the pilot

  • Industrial instrumentation
  • Borosilicate glass and stainless steel AISI 316L manufacturing
  • Rigid process pipes
  • Cooling at the bottom of the column
  • Continuous or batch processes

Principle of Working:

The absorption process is a mass transfer of a compound present in a gaseous phase to a liquid phase by dissolution. The inverse transfer operation of a gas dissolved in a liquid using an inert gas is called desorption. These processes are done in a packed column between a climbing gaseous effluent and a solution or a solvent flowing down (counter-current operation). The presence of packing increases the liquid-gas exchange surface, therefore the mass transfer.
A heat exchanger at the bottom of column allows to cool the out flowing solution (the absorption is an exothermic reaction); in batch mode this heat exchanger allows to check the influence of the temperature on the efficiency of the absorption. A static mixer, situated upstream of the gas introduction in the column, is used to dilute the gas to process with an inert gas (air or nitrogen).

Teaching objectives

  • Study of the following experimental parameters :
  • Study of the hydrodynamics of the column.
  • Study of the absorption without chemical reaction.
  • Study of the absorption with chemical reaction.
  • Influence of the head loss on the efficiency of the column.
  • Continuous or batch functioning.
  • Study of the desorption by an inert gas.
  • Calculations :
  • Thermal balance.
  • Mass balance.
  • Determination of the number of theoretical stages (McCABE and THIELE, KREMSER and BROWN).
  • Determination of the number of transfer units
  • Coefficient of mass transfer.

Technical specifications


  • Storage tank of the feeding solution or the feeding solvent in polyethylene.
  • Feed solution metering pump, AISI 316L stainless steel body, P.T.F.E. diaphragm, manual control..
  • Traps for pressure drop measurement.
  • Column in borosilicate glass, in three elements with “RASCHIG” rings packing in borosilicate glass.
  • Four plates made of AISI 316L stainless steel, equipped each with sampling valves (gaseous phase and liquid phase) and with a temperature plug.
  • Head of column in borosilicate glass, NB50, with introduction of the solution or the solvent and draining off the gaseous phase.
  • Bottom of column in borosilicate glass, NB50, with introduction of the gaseous phase.
  • Vertical heat exchanger, borosilicate glass body AISI 316L stainless steel exchanger.
  • Adjustable liquid seal.
  • Solution receiver in borosilicate glass, equipped with a draining valve made of AISI 316L stainless steel.
  • AISI 316L stainless steel connecting tubes for the process and reinforced PVC for cooling fluid tube.
  • Support framework with AISI 304L stainless steel tubes, aluminium connecting nuts and adjustable feet.


  • Supply of the cooling water of the heat exchanger equipped with a variable area lowmeter with its adjusting valve.
  • Measurement of the column pressure drop by differential “U” type manometer.
  • Control cabinet, IP55, equipped with an emergency stop button, operating buttons and the following interfaces :
  • Two temperature digital indicators with nine Pt100 Ω type probes

Dimensions and weight

  • 1, 3 x m 0, 75 x m 2, 9 m ~ 120 kg.

Essential requirements

  • 230 V / 50 Hz / Single phase : 0.5 kW.
  • Cold water 20 °C / 3 bar : 600 l/h.
  • Compressed air / 6 bar : 20 Nm3/hs
  • Reactive gas with relief valve 3 bar : 1 Nm3/h
  • Evacuation of the toxic gases
  • Drain


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