Solvent Extraction Apparatus

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Solvent Extraction Apparatus

Velp Extraction Apparatus for the Quantitative Separation of Substances by Solvents

The Randall Technique:

Solvent extraction is used for the determination of many different components of products deriving from agriculture and industry or contained in environment samples.

The Soxhlet extraction is one of the most widely used analytical techniques. Different aspects of the Soxhlet extraction procedure have been modified.

Some of these attempt to increase the temperature of solvent coming into contact with the sample mixture to be extracted, in order to reduce the extraction time. The modification introduced by the American chemist Edward L. Randall is among the most effective for this purpose.

The first phase of extraction is performed by immersion of a sample containing containing thimble in boiling solvent followed by a washing by refluxing solvent. The fast solubilisation by the hot solvent allows a sharp reduction of extraction time.

The Velp SER 148/3 and SER 148/6 Solvent Extraction Apparatus allow the quantitative separation of a substance or a group of substances (e.g. fats) from a mixture of solids or semi-solids. The extraction is performed, according to the Randall technique,in two phases with a final recovery of the used solvent, allowing a reduction of atmospheric pollution, of the extraction time and the costs of analysis.

The equipment, designed for optimised manual use, is controlled by a programmable microprocessor allowing to choose among 29 programmes; two different displays will constantly show actual temperature and residual working time for the selected programme.

The extractions are performed under high safety conditions because the equipment follows the norms CEI EN 60529 with an IP 55 protection degree and is manufactured from advanced materials and with innovative technical details.

The main sectors of applications include the analysis of food, feed, detergents, rubber and plastic formulates, pharmaceutical products, soils and others, for their content of soluble components like fats, tensides, plastifiers and pesticides.

Features common to both models:

  • Suitable for AOAC, EPA, TAPPI, UNI, ASTM, APHA, AWWA and WEF methods
  • Epoxy painted stainless steel structure with excellent resistance to the attack ofchemical
  • and mechanical agents and to corrosion in general
  • Shortening of extraction times: from 20 to 80%
  • Reproducibility: +/- 1% relative or better
  • Solvent recovery rate: from 50 to 70%
  • Cooling water: 8 litre / minute
  • Sample volume: from 0.5 to 15 g. (normal 3 g.)
  • Solvent volume: from 30 to 100 ml.
  • Memorisable programmes: 29
  • Settable parameters and values for each programme:
  • work temperature: from 100 to 260oC
  • immersion time: from 0 to 999 minutes
  • washing time: from 0 to 999 minutes
  • recovery time: from 0 to 999 minutes
  • Extraction thimbles: pure cellulose 33 x 80 mm.
  • 2 displays: showing working temperature / setting parameters
  • Safety devices:
    • 2 different microprocessor controlled electronic circuits with Pt 100 probe
    • protection according to IP 55 standards
    • signal for absence of or insufficient cooling water
  • Work temperature: settable from 100 to 260oC
  • RS 232 interface
  • Dimensions:
    • SER 148/3 - 480W x 390D x 620H mm.
    • SER 148/6 - 700W x 390D x 620H mm.
  • Weight:
    • SER 148/3 - 30 Kg.
    • SER 148/6 - 40 Kg.
  • Total electric power:
    • SER 148/3 - 400 W
    • SER 148/6 - 900 W

Ordering Information:


Velp Model SER 148/3 Solvent Extraction Apparatus, 3 Places

Supplied with extraction cups, extraction thimbles (pack of 25), extraction thimbles holder, Viton and butyl seals, operations / methods manual


Velp Model SER 148/6 Solvent Extraction Apparatus, 6 Places

Supplied with extraction cups, extraction thimbles (pack of 25), extraction thimbles holder, Viton and butyl seals, operations / methods manual

Accessories common to both models:


Heat shield (recommended)


SER148 cable x RS232




Extraction cup


Extraction thimbles holder


Viton seal


Butyl seal


Extraction thimbles holder


Weighing cup


Pincer for weighing cups


Thimbles stand (6 places)


Extraction thimbles (pack of 25)

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