Ethyl ethanoate , solvent extraction

The drying agent was removed by filtration. Describe how caffeine could then be extracted from the ethyl ethanoate solvent. 

Caffeine can be extracted from coffee and tea using solvent extraction. A tea solution was mixed with the solvent ethyl ethanoate in a separating funnel and the funnel was shaken. The layers were left to settle and the lower aqueous layer was then removed and the ethyl ethanoate layer was drained and stored. 

For liquid-liquid extraction, water is usually the polar solvent. Since most extractions involve getting the required compound into the organic solvent (or removing unwanted ionic chemicals from it), it should have good solvent power for the desired compound and a low boiling point for ease of removal and recovery of the compound. The common organic solvents used in liquid-liquid extraction are diethyl ether (ethoxyethane) b.pt. 34 °C, dichloromethane (DCM) b.pt. 41 °C and ethyl acetate (ethyl ethanoate) b.pt. 77 °C. Dichloromethane is denser than water and forms the lower layer, whereas diethyl ether and ethyl acetate float on water and are the upper layer. 

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