What are the advantages and disadvantages of solvent extraction?

Answer 1

The advantages are:

- Goldfish requires less solvent than Soxhlet (solvent in Soxhlet has to reach the siphon level).

- Goldfish is quicker because the sample is constantly in contact with the solvent.

Source: CECCHI, Heloísa Máscia."Fundamentos Teóricos e Práticos em Análise de Alimentos". Editora Unicamp. 2a Edição. 207p. 2003.

Answer 2

The advantage of this system is that instead of many portions of warm solvent being passed through the sample, just one batch of solvent is recycled. This technique is particularly useful in cases when the pure compound is partially solubel in a solvent and the impurity is not soluble in that solvent and vise versa.Also the working principle of mechanism is so simple that we can obtain more desired compounds without any difficulty.

Answer 3

Advantage:

- Isolate desired oil when it has limited solubility in a solvent and when impurity is insoluble in a solvent

Disadvantages:

-Long time process

-Poor extraction of Polar lipids

-Large volume of solvents required

Answer 4

The purpose of using a soxhlet is the ability to perform a large number of extractions on a liquid or solid sample with minimal effort. Take, for example, a liquid sample to be extracted with methylene chloride. The sample is placed in the soxhlet and equipped with a round-bottom flask and a condensor. The MC is refluxed and condensed, causing it to fall and pass through the liquid sample. The solvent is returned to the flask via a special arm on the soxhlet. This extraction procedure is performed hundreds of times over the course of a few hours. It is the best way to recover small amounts of analytes which are very soluble in water.

Answer 5

The solvent used depends on its polarity. As the solvent boils the vapour passes through the condensor and the pure form of the solvent drops on the sample

Answer 6

The extracting solvent always has zero concentration of the material to be extracted when the solvent first contacts the substrate to be extracted, so that the extraction rate is increased.

Answer 7

Solvent extraction is mainly used in Nuclear processing and Perfumes. It is the extraction of a compound from one liquid into other.