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# MANUAL ABSORPTION / DESORPTION PILOT PLANT MP1040

### 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

EQUIPMENT :

• 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.

• 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.

INSTRUMENTATION :

• 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