Organic 2 Review Problem 82

Organic 2 Review Problem 82 - of 45, and fitted with a long...

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66 PRACTICAL ORGANIC CHEMISTRY Steam Distillation. A compact and efficient apparatus is shown in Fig. 43. The liquid to be steam-distilled is placed in the tube A and water is placed in the outer flask B. On heating B, steam passes into the inner tube A through the inlet tube C, and steam-volatile compounds are rapidly distilled and collected in the receiver placed at the end of the condenser D. For small quantities of compounds which are readily volatile in steam, it will often suffice to add water to the crude material in the reaction flask (e.g., Fig. 36) and to heat directly with a small flame. 12 cm. FIG. 43- FIG. 44- A very suitable apparatus for semi-micro steam-distillation, particu- larly for suspensions that are likely to "bump" badly, is shown in Fig. 44. This consists of a 50 ml. Kjeldahi flask, clamped at an angle
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Unformatted text preview: of 45, and fitted with a long glass tube for the inlet of steam. The outlet-tube is bent twice, first at 135 and then at 45 as shown, and fitted into a small water-condenser. Steam generator. For small scale work the steam generator ^D, Fig. 15, p. 33) is too cumbersome for the production of a small amount of steam. It is preferable to use a 250 ml. conical flask fitted with cork containing a vertical safety tube and an outlet-tube (Fig. 44). Care should be taken that the length of rubber tubing connecting the steam outlet tube to the flask containing the material to be distilled should be as short as possible and should not contain kinks. Crystallisation and Filtration. Crystallisation is carried out in apparatus of conventional type but reduced in size. Glass rods should...
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