| 英文名 | Acetone |
|---|---|
| 中文名 | 丙酮 |
| 类型 | 脂肪族化合物 |
| CAS号 | 67-64-1 |
| 物理性质 | M 58.1, b 56.2℃, d420 0.791, nD25 1.35880, pK125 -6.1 (basic, mono-protonated), pK225 20.0 (acidic) |
| 提纯方法 | The commercial preparation of acetone by catalytic dehydrogenation of isopropyl alcohol gives relatively pure material. Analytical reagent quality generally contains less than 1% of organic impurities but may have up to about 1% of H2O. Dry acetone is appreciably hygroscopic. The main organic impurity in acetone is mesityl oxide, formed by aldol condensation. It can be dried with anhydrous CaSO4, K2CO3 or type 4A Linde molecular sieves, and then distilled. Silica gel and alumina, or mildly acidic or basic desiccants cause acetone to undergo the aldol condensation, so that its water content is increased by passage through these reagents. This also occurs to some extent when P2O5 or sodium amalgam is used. Anhydrous MgSO 4 is an inefficient drying agent, and CaCl2 forms an addition compound. Drierite (anhydrous CaSO4 ) offers minimum acid and base catalysis for aldol formation and is the recommended drying agent |
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