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Natural Science Forum / Chemistry / Organic Synthesis / July 2005extraction of caffeine from tea leaves
What is the purpose of adding sodium chloride to a caffeine solution after suction filtration and just before extraction with chloroform in a separatory funnel? I would be grateful for a reply. probably to saturate the aqueous phase with NaCl, and make the extraction easier. > What is the purpose of adding sodium chloride to a caffeine solution > after suction filtration and just before extraction with chloroform in > a separatory funnel? I would be grateful for a reply. I'm pretty shure the Idea is to increas the concentration of Cl ions and force more of the Caffleine salt into the organic phase, excess HCl can do the same job but it tends to make the chloroform soluable as well. A much nicer extraction without cloroform can be done using acetic acid or as the coffie decaffination companies are doing lately CO2 will extract directly to an aquious phase, then the solution can be left to stand or sparged with other gasses, in both of the previous cases the objective is "Food Grade" caffeine. |
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