Filtration, the process of removal of solids from liquids, is a method of purification of liquids and the most fundamental solution. Filtration is not only used in small scale in the laboratory but also in large scale water purification unit. Filter paper and filter used to remove solids from liquids or solvents. By regulating the mesh size, particle size can be chosen removed.
Adsorption Not easy to get rid of very small particles by filtration because the particles of this kind will tend to clog filters. In such cases the recommended use of the filter which selectively adsorbs small amounts of impurities.
Extraction
Extraction is a technique often used when organic compounds (mostly hydrophobic) dissolved or dispersed in water. Suitable solvent (enough to dissolve the organic compounds; should not hydrophobic) was added to the solution phase in the water, then stir the mixture well so that the organic compounds extracted properly.
Recrystallization
As a method of purification of solids, recrystallization has a long history such as distillation. Although some of the more complex methods have been introduced, recrystallization is the most important method for purification because of its simplicity (no need for special tools) and because of its effectiveness
Distillation
Distillation is the art of separating and purifying by using the difference in boiling points. Distillation has a long history and origin of the distillation can be found in ancient times to get a plant extract which is estimated to be a source of life. Distillation techniques improved when the condenser (cooling) is introduced. Gin and whiskey, with a high alcohol concentration, obtained with this improved technique.
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