Organic 2 Review Problem 53

Organic 2 Review Problem 53 - through F back into E From...

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METHODS AND MANIPULATION 37 The two forms of apparatus, Fig. 17 (A) and (B), are suitable for any solvent immiscible in and lighter than water. Fig. 18 (A) shows an FIG. 18. apparatus suitable for continuous extraction of aqueous solutions with solvents heavier than water (e.g., chloroform). In this case chloroform is placed in the flask E, and the aqueous solution in tube A. The chloroform is boiled and its vapour ascends the tube B, is condensed and then falls in droplets through the aqueous phase in A. When the lower chloroform layer reaches a certain height much of it will siphon
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Unformatted text preview: through F back into E. From here the solvent is recycled, and gradu-ally the chloroform in E becomes more concentrated with respect to the solute. A convenient alternative apparatus for continuous chloroform extrac-tion is shown in Fig. 18 (B). Soxhlet Extraction. Occasionally a crude product (often of natural occurrence) is obtained, from which a particular component may be isolated by repeated extraction with a hot solvent. For this purpose, Soxhlet's Extraction Apparatus (Fig. 19) is usually employed....
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.

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