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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.
Abantado
1 day
Mga Tagubilin
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.
Mga kailangang kasangkapan:
Sodyo
Benzyl Alcohol
Prasko na bilog ang ilalim
Malaking Kaldero
Timbangang panimbang
Gwantes na goma
Salamin Laban sa Tilamsik ng Kemikal2
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.
Mga materyales para sa hakbang na ito:
Benzaldehyde454 gMga kailangang kasangkapan:
Prasko na bilog ang ilalim
TermometroMalaking Kaldero3
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.
Mga kailangang kasangkapan:
Malaking KalderoPrasko na bilog ang ilalim4
4
Wash
Wash
Cool, add 200 ml of water and separate the oil. Wash it once more with water.
Mga kailangang kasangkapan:
Tubig
Embudong panghiwalay5
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.
Mga kailangang kasangkapan:
Prasko ng Salamin sa Distilasyon
Ikid ng kondensador
Bombang panghigop ng hanginTermometro
Mga boteng salamin na may taponMga Materyales
1- 454 gPlaceholder
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