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COMPUTERISED STIRRED LIQUID - LIQUID EXTRACTION PILOT SP1030

Main characteristics of the pilot

  • Industrial instrumentation

  • Borosilicate glass and stainless steel AISI 316L manufacturing

  • Rigid process pipes

  • ATEX stirring motor with variable speed

  • Graduated receivers in borosilicate glass

  • Process supervision with micro-computer

 

PRINCIPLE OF WORKING :

Liquid-liquid extraction allows to transfer a solute (dissolved in a feed solvent and forming the solution) into an extraction solvent with which it has more affinity ; the feed solvent and the extraction solvent are not miscible.

The light phase is introduced at the bottom of the column then climb toward the superior decanter of the column. The heavy phase introduced at the head of column flows down toward the decanting area situated at the bottom. A stirring device (composed of a succession of turbines and decanting plates distributed along the column) allows a mixing of the two phases flowing at counter-current and the transfer of the solute to extract into the extraction solvent. The decanters are used for the separation of the non miscible phases ; the extracted phase enriched in solute and the raffinate phase depleted in solute are carried out in a continuous way from these decanters.

 

Teaching objectives

  • Influence of the solution and solvent flow rates

  • Influence of agitation (stirring)

  • Process conducted remotely by industrial supervisor.

Calculation :

  • Mass balance

  • Determination of the theoretical number of stages (Mc CABE and THIELE, ternary diagrams)

  • Number of transfer units

  • Calculation of the mass transfer coefficient

 

Technical specifications

 

EQUIPMENT :

  • Two storage tanks of the solution and the extraction solvent made of Polyethylene.

  • Feeding metering pump of the solution, AISI 316L stainless steel body, PTFE diaphragm, remote control.

  • Feeding metering pump of the extraction solvent, AISI 316L stainless steel body, PTFE diaphragm, remote control.

  • Lower decanter in borosilicate glass with introduction of the light phase, discharge of the heavy phase and sampling valve.

  • Upper decanter in borosilicate glass with introduction of the heavy phase, discharge of the light phase by overflow and sampling valve.

  • Column made of borosilicate glass in 3 elements.

  • Stirring device with turbines made of AISI 316L stainless steel driven by an ATEX electric motor with variable speed drive.

  • Four guiding and sampling plates made of AISI 316L stainless steel.

  • Extract phase receiver made of borosilicate glass with drain valve.

  • Raffinate phase receiver made of borosilicate glass with drain valve.

  • AISI 316L stainless steel connecting tubes.

  • Support framework with AISI 304L stainless steel tubes, aluminium connecting nuts and adjustable feet.

     

INSTRUMENTATION :

  • Measurement of the upper decanter level by differential pressure transmitter.

  • Industrial supervision software with real-time process display, data acquisition and remote instrumentation, “WINDOWS” operating system.

  • IP55 command and control cabinet equipped with an emergency stop, operating buttons and the following interfaces :

  • Electronic speed drive of the stirrer.

  • Two feed pump controllers with MODBUS link.

  • Level interface controller with MODBUS link and pneumatic actuator control valve.

  • Digital display indicator of the stirring speed with MODBUS link.

  • Digital temperature indicator with two Pt100 Ω type probes and MODBUS link

 

Dimensions and weight

1700 mm x 850 mm x 3160 mm ~ 120kg

 

Essential requirements

230V/50Hz/ Single phase – 2 x 1 kW.

Evacuation of the solvent vapours.