In this process the compounds are separated based on

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Unformatted text preview: is process, the compounds are separated based on their solubilities into two immiscible liquids such as water and chloroform. Since caffeine dissolves in chloroform, two immiscible liquids have appeared namely, the chloroform layer and the aqueous layer. Since they are immiscible they can be easily separated by letting the aqueous layer out of the separatory funnel. After adding additional amount of chloroform, more aqueous layer was formed and separated. With shaking and swirling of the separatory funnel, bubbles appeared. These are called emulsions. An emulsion is a mixture of two immiscible liquids. When tannins are converted to their salts, they become an ionic surfactant. These causes the materials that don¶t dissolve in water to form an emulsion with water. This emulsion can be minimized by careful handling and swirling of the separatory funnel. Sodium sulphate was also added in order to remove traces of water left with the chloroform layer. To separate caffeine from chloroform, distillation was done. Their differences in volatility and boiling points made them easy to separate by simple distillation. Chloroform has a boiling point of 60° C which is lower than caffeine. The solution started to boil vigorously within 54° C and constantly boiled at 60° C for several minutes...
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This document was uploaded on 03/03/2014.

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