SOXHLET TECHNIQUE

The solubilization of extractable is performed by cold solvent which drops from the condenser. Usually, a complete extraction requires a lot of hours.

RANDALL TECHNIQUE

Randall technique consists in a first extraction phase obtained by immersion of the thimble containing the sample in boiling solvent, followed by a second phase,“washing”, during which the sample is washed by the solvent dropping from a condenser. A fast solubilisation of the components from the sample is obtained during the first step, by the boiling solvent, permitting a considerable reduction of the overall time required for analysis. Randall system permits also to recover the used solvent at the end of extraction procedure.

MAIN ADVANTAGES OF VELP'S EXTRACTOR COMPARED TO SOXHLET

This technique has three great benefits over the traditional Soxhlet technique:
- up to 5 times faster than Soxhlet (hot solvent vs. cold solvent)
- low solvent consumption (solvent recovery)
- limited cost per analysis