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Benzyl Benzoate: Benzaldehyde and Sodium Benzylate
Benzyl benzoate is an oily ester that dissolves PVC when hot and softens it. Kamm (Organic Syntheses, 1921): a little sodium dissolved in benzyl alcohol turns two molecules of benzaldehyde into one of benzyl benzoate. Keep it below 50 to 60 °C as it mixes, or it overheats into benzyl ether. 454 g of benzaldehyde give 410 to 420 g. Sodium metal burns in water: keep it dry.
The picture: our own drawing.
高级
1 day
说明
1
1
Dissolve the sodium in benzyl alcohol
Dissolve the sodium in benzyl alcohol
Goggles and gloves on. Warm 3 g of sodium in 70 g of pure benzyl alcohol for half an hour until it dissolves. Let it cool to room temperature.
所需工具：
钠
苯甲醇
圆底烧瓶
大锅（下层，用于水浴）
等臂天平
橡胶手套
化学防溅护目镜2
2
Add it to the benzaldehyde, cool
Add it to the benzaldehyde, cool
Add the solution little by little to 454 g of benzaldehyde, mixing well. Cool if needed to keep it just below 50 to 60 °C. It sets to a pasty jelly.
此步骤所需材料：
苯甲醛454 克所需工具：
圆底烧瓶
温度计大锅（下层，用于水浴）3
3
Warm on the water bath
Warm on the water bath
When the temperature stops rising, after about half an hour, warm it on the water bath for one to two hours, shaking now and then.
所需工具：
大锅（下层，用于水浴）圆底烧瓶4
4
Wash
Wash
Cool, add 200 ml of water and separate the oil. Wash it once more with water.
所需工具：
水
分液漏斗5
5
Distil under vacuum
Distil under vacuum
Distil under vacuum. Benzyl alcohol, leftover aldehyde and water come first. When the temperature jumps, change the receiver: benzyl benzoate boils at 184 to 185 °C at 15 mm. Expect 410 to 420 g.
所需工具：
玻璃蒸馏瓶
冷凝器盘管
真空泵温度计
带塞玻璃瓶此蓝图制作
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