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Organic Lab Reactions 202

Organic Lab Reactions 202 - isopropyl alcohol is the...

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RECOVERY OF ISOPROPYL ALCOHOL 197 top of this tube is connected to a small reflux condenser. The outside of the condenser below the side arm is wrapped with cloth or asbestos paper. The refluxing mixture boils the ethanol in the inner condensing tube, and most of the isopropyl alcohol is returned to the flask, while the lower-boiling acetone is permitted to distil. If several reductions are to be carried out this apparatus is highly recommended. Fia. 3. Instead of a steam bath or a water bath, an electrically heated oil bath is suitable. This permits easy regulation of the rate of distillation. However, the temperature of the bath should not exceed 95-100° when
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Unformatted text preview: isopropyl alcohol is the solvent if possible^ dehydration of a sensitive alcohol is to be avoided. For this same reason, a burner, hot plate, or sand bath is not recommended for heating. Especially at the end of the reduction, superheating of the concentrated alkoxide solution may bring about dehydration or other decomposition of the product. An apparatus suitable for micro quantities (5 to 50 mg.) has been described. 22 Recovery of the -Isopropyl Alcohol Because of the low cost of isopropyl alcohol it is usually not economical to recover the solvent. However, .if the isopropyl alcohol is to be recov-...
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