The solid phase is conveyed in the extractor by an Archimedean screw of PTFE, whereas the solvent will fall in countercurrent by gravity. Solvent and extracted product, as well as the exhausted solid, are stored in proper tanks. This unit enables to study countercurrent solid-liquid extractions in a continuous extractor with Archimedean screw.

The solid, stored in a hopper, is fed to the extractor via an Archimedean screw. The automated version also includes a PID controller that enables to control the solvent pre-heating temperature automatically. The solvent, stored in a tank, is sent to the top of the extractor by a metering pump.

TRAINING PROGRAM

Calculation of the number of theoretical stages

Automatic temperature control with PID controller

Study of the extraction performance versus the nature and flow rate of the solid, and the type, flow rate and temperature of the solvent

Extraction of chlorophyll from spinach with ethanol

Extraction of oil from soybean laminate with hexane

Extraction of starch from potatoes with water

Extraction of oil from olive husk with hexane.