A countercurrent extraction cascade is used to extract acetone (A) from its mixture with water by means of methyl isobutyl ketone (MIK). The feed consists of 40 weight percent acetone and 60 weight percent water with an equal amount of MIK. How many stages are needed so that the extract contains 20% acetone and the raffinate contains 10% acetone? Use and show tertiary diagram.

A countercurrent extraction cascade is used to extract acetone (A) from its mixture with water by means of methyl isobutyl ketone (MIK). The feed consists of 40 weight percent acetone and 60 weight percent water with an equal amount of MIK. How many stages are needed so that the extract contains 20% acetone and the raffinate contains 10% acetone? Use and show tertiary diagram.

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter89: Thin-layer Chromatography

Section: Chapter Questions

Problem 4P

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1.063 g of p-acetamidophenol was measured out into a 50 mL round bottom flask along with 8 mL of 1M NaOH in ethanol and a stir bar. This mixture was heated at reflux for 15 min. It was allowed to cool and then 0.80 mL of bromoethane was added to the reaction. The mixture was then heated at reflux for another 15 min. After heating, the solution was poured onto a mixture of ice and water and further cooled on ice and then the solid was collected by vacuum filtration. This solid was then recrystallized from ethanol and water. The final mass of the purified phenacetin was 0.42250 g and it had a melting point of 127 - 130 C. The TLC plate shows (from left to right) pure p-acetamidophenol, the reaction mixture before pouring it on ice/water, phenacetin after recrystallization. The solvent used was a mixture of 80% ethyl acetate and 20% heptane with 0.5% acetic acid added. QUESTION: Using the given TLC plate can you describe the results and what does the TCL plate tell about the purity?
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