Using Solid Liquid Extraction Of Caffeine From Tea Leaves

The purpose of this experiment was to use solid-liquid extraction to isolate a crude sample of caffeine from tea leaves and then subsequently purify the isolated sample via sublimation. The two solvents used in the extraction were water and dichloromethane. In addition to caffeine, tea leaves also contain other compounds that must be dealt with including cellulose, proteins/pigments, tannins, and saponins. Cellulose is not soluble in water as a result of its high molecular weight and thereby does not dissolve in water during the boiling process. Proteins and pigments are highly soluble in water and thereby do not present any problems since caffeine is being extracted into the organic layer. Tannins are soluble in the organic layer and can become problems when trying to isolate just caffeine. To deal with Tannins, we add weakly basic CaCO3 during the boiling process so that the ester bonds in Tannins are cleaved thereby producing their corresponding calcium salts, which become water-s oluble. Saponins cause increased solubility of organic molecules in the aqueous layer and are dealt with by salting out the aqueous layer so that it becomes more polar leading to decreased organic solubility in it. Moreover, saponins can cause emulsions to form because of their membrane like properties and this can be dealt with via centrifugation prior to each extraction. Following extraction of caffeine in dichloromethane, the organic solvent can be evaporated so that a crude sample of caffeineShow MoreRelatedEffectiveness Of An Extraction Process And Purification Process955 Words   |  4 Pageseffectiveness of an extraction process and purification process by sublimation is observed and used to selectively separate caffeine from teabags. In the first part of the experiment, water soluble materials, including caffeine, within the teabags are extracted into hot water because the solubility of caffeine in water increases as temperature increases. This is due to the concept that in creasing kinetic energy through increasing temperature will allow the molecules in the solute to break apart from the intermolecularRead MoreExtraction of Caffeine from Tea Leaves1151 Words   |  5 PagesExtraction of Caffeine from Tea Leaves Introduction Caffeine is soluble in boiling water and as a result it is easily extracted from tea bags by steeping in hot water. This process leaves behind the water insoluble portions of the tea bag. However, water extracts more than just caffeine, so a final separation is done with an organic solvent that will dissolve primarily caffeine. The organic solvent used in this experiment is Dichloromethane (CHâ‚‚Clâ‚‚). Dichloromethane is less polar than waterRead MoreEssay Separation of Benzoic Acid and Acetanilide1243 Words   |  5 PagesReport 13 October 2011 Table of Contents Separation of Benzoic Acid and Acetanilide 3 Extraction and Purification of Caffeine from Tea 4 Extraction of Trimyristin from Nutmeg 5 Conversion of t-butanol to t-butyl chloride 6 Appendix 7 Calculations 8 Literature and Experimental Values of Benzoic Acid and Acetanilide 9 Experimental Caffeine IR 10 Literature Caffeine IR 11 Experimental Trimyristin IR 12 Literature Trimyristin IR 13 Experimental Tert-Read MoreExtraction Of Caffeine From Tea1878 Words   |  8 Pages EXTRACTION OF CAFFEINE FROM TEA Abstract The method used to separate the organic compound from a mixture of compound is the extraction. It is done by the dissolving of one or more compounds in a good solvent. The solvent which was used in this experiment was 15 ml of dichloromethane into 125ml of water. Caffeine was extracted from 9.19 g of TAZO Awake English Breakfast. Caffeine is soluble in water in 2.2 g/ml at 20 C; it is more soluble than dichloromethane which has 10.2g/ml at 20Read MoreUsing The Solid Liquid And Liquid Extraction Techniques For Extract A Strong Acid1613 Words   |  7 Pages Extraction Aleigha Spaulding Joseph Osazee 10-6-15 Abstract: This report presents the percentage recoveries found when using the solid-liquid and liquid-liquid extraction techniques to extract a strong acid, weak acid, base, and neutral compound from a mixture. During the solid-liquid section of the experiment, 0.5 M NaHCO , 0.5 M NaOH, 0.5 M HCl, and distilled water are used to dissolve and separate the acid, phenol, and amine solutions from the mixture, leaving the neutralRead MoreMethods Of A Solvent System For Extraction1652 Words   |  7 PagesIntroduction Extraction is a technique that is commonly used to separate mixtures, despite whether the components are solids or liquids. One of the most well-known examples of extraction is the brewing of tea or the making of coffee. Every pot of coffee or cup of tea involves solid-liquid extraction. The soluble flavor and caffeine are extracted from the solid tea leaves or ground coffee beans into hot water (the solvent). Insoluble plant material is left behind in the tea bag or coffee filterRead MoreEssay Acid Base Extraction1511 Words   |  7 Pages Acid Base Extraction The purpose of this laboratory assignment was two-fold, first, we were to demonstrate the extraction of acids and bases, finally, determining what unknowns were present. Second, we were to extract caffeine from tea. These two assignment will be documented in two separate entities. 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