25378352-MULTIPLE-EXTRACTION-OF-CAFFEINE-FROM-DRIED-TEA-LEAVES-USING-DICHLOROMETHANE

25378352-MULTIPLE-EXTRACTION-OF-CAFFEINE-FROM-DRIED-TEA-LEAVES-USING-DICHLOROMETHANE

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
MULTIPLE EXTRACTION OF CAFFEINE FROM DRIED TEA LEAVES USING   DICHLOROMETHANE AUTHORS:  Dizon, S., Donato, A.K., Dy, A., Enriquez, K.B., Fauni, M.B. ABSTRACT: Caffeine was extracted from dried tea leaves by multiple extraction technique. 10 g. of tea  leaves was boiled in a solution of 4.4 g. anhydrous sodium carbonate and 100 ml distilled water and  was extracted three times using 20 ml of dichloromethane. The residue was collected by decanting  the mixture of organic extract and anhydrous sodium sulfate and evaporating it to dryness. The  percentage yield was computed by getting the ratio of the weight of the crude caffeine (residue) and  weight of the tea leaves used. The percentage yield was 5.33%.  I.) INTRODUCTION Extraction is the process of obtaining  something from a mixture or compound using  chemical, physical, or mechanical means. The  theory   of   extraction   lies   in   the   concept   of  immiscibility between two phases to separate  a solute from the other phase. There are two  main types of extraction in chemistry namely:  Liquid-liquid   extraction   (also   known   as  Solvent   extraction   or   Partitioning),   which   is  further   divided   into   two   types   (simple   and 
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/01/2010 for the course CHEM 331 taught by Professor Hgf during the Spring '10 term at Acadia.

Page1 / 6

25378352-MULTIPLE-EXTRACTION-OF-CAFFEINE-FROM-DRIED-TEA-LEAVES-USING-DICHLOROMETHANE

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online