30.08.2019
 Extraction of Caffeine by Tea Leaves Essay

Extraction of Caffeine from Tea Leaves

Intro

Caffeine is sencillo in boiling water and as a result it is easily removed from tea bags simply by steeping in hot water. This method leaves behind this particular insoluble portions of the tea bag. Yet , water ingredients more than just caffeine, so one final separation is carried out with a natural solvent that could dissolve generally caffeine. The organic solvent used in this experiment is usually Dichloromethane (CHв‚‚Clв‚‚). Dichloromethane is less polar than water which difference in polarity permits the separating. Extraction of the tea with the Dichloromethane, and then evaporation in the organic solvent leaves crude caffeine, which will on sublimation yields a comparatively pure item. Sublimation may be the transition of a substance from the solid period directly to the gas period without going through intermediate liquifications. This process is preferred more than recrystallization because it is better at removing harmful particles. Experimental

In this extraction try things out two bags of tea were employed, which is approximately 4 grms of tea. Water was heated in a small beaker until it began to steam. It was in that case removed from heat and 2 grams of Na2CO3 was added and dissolved. Finally the loose gourmet tea was added to the water and allowed to large for 5 minutes. After 5 minutes the mixture was put through a suction filtration. A suction channel was guaranteed on top of the suction flask with the vacuum pressure tubing. Simply no filter daily news was used for the reason that tealeaves were very study course. Then 400mg of NaCl was added and dissolved. The solution was then cooled down in an snow bath. The solution was in that case transferred to a separatory channel and was washed 3 times using 5 ml area of CH2Cl2. CH2Cl2 formed a different layer on the bottom of the flask and was drained right into a 25 ml flask after each rinse. Each rinse was carefully swirled to stop emulsion. The combined washes were then simply dried employing small helpings of Na2SO4 two times to take out any drinking water. A suction...