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Benzyl Benzoate: Benzaldehyde and Sodium Benzylate
Charlie

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Charlie

18. Ukwakira 2026DE
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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.
Hejuru
1 day

Amabwiriza

1

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.

Ibikoresho bikenewe:

SodiyumuSodiyumu
Benzyl alcoholBenzyl alcohol
Icupa rifite igituza kizengurutseIcupa rifite igituza kizengurutse
Isafuriya nini (iyo hasi, y'amazi ashyushye)Isafuriya nini (iyo hasi, y'amazi ashyushye)
Umunzani w'ibiroUmunzani w'ibiro
Uturindantoki tw'ikawusuUturindantoki tw'ikawusu
Amadarubindi yo Kwirinda IbinyabutabireAmadarubindi yo Kwirinda Ibinyabutabire
2

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.

Ibikoresho by'iyi ntambwe:

BenzaldehydeBenzaldehyde454 g

Ibikoresho bikenewe:

Icupa rifite igituza kizengurutseIcupa rifite igituza kizengurutse
Igipima UbushyuheIgipima Ubushyuhe
Isafuriya nini (iyo hasi, y'amazi ashyushye)Isafuriya nini (iyo hasi, y'amazi ashyushye)
3

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.

Ibikoresho bikenewe:

Isafuriya nini (iyo hasi, y'amazi ashyushye)Isafuriya nini (iyo hasi, y'amazi ashyushye)
Icupa rifite igituza kizengurutseIcupa rifite igituza kizengurutse
4

Wash

Cool, add 200 ml of water and separate the oil. Wash it once more with water.

Ibikoresho bikenewe:

AmaziAmazi
Igifuniko gitandukanyaIgifuniko gitandukanya
5

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.

Ibikoresho bikenewe:

Icupa ry'ikirahure ryo kuyungururaIcupa ry'ikirahure ryo kuyungurura
Umuzingo w'ikondanseriUmuzingo w'ikondanseri
Pompe ikuramo umwukaPompe ikuramo umwuka
Igipima UbushyuheIgipima Ubushyuhe
Amacupa y'ikirahuri afite ibipfundikizoAmacupa y'ikirahuri afite ibipfundikizo

Ibikoresho

1

Ibikoresho bikenewe

14

Iki gishushanyo gikora

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Agateganyo

Benzyl benzoate

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Blueprint zijyanye

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Benzaldehyde: Oil of Bitter Almonds by Steam Distillation
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Benzaldehyde: Oil of Bitter Almonds by Steam Distillation

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