Benzyl Benzoate Freezing Point

[Exhortae]

Hi,

If I understand correctly benzyl benzoate is supposed to freeze at 18°C (64 °F).

Well I put mine in a small glass recipient (maybe 5 ml of benzyl benzoate) and in the fridge (around 5°C) and even after 1 hour it didn't freeze, it is still liquid.

Can someone with benzyl Benzoate do this experiment at home and tell me if theirs is freezing).

Thank you.

 

[Sampei]

Hi,

If I understand correctly benzyl benzoate is supposed to freeze at 18°C (64 °F).

Well I put mine in a small glass recipient (maybe 5 ml of benzyl benzoate) and in the fridge (around 5°C) and even after 1 hour it didn't freeze, it is still liquid.

Can someone with benzyl Benzoate do this experiment at home and tell me if theirs is freezing).

Thank you.

Isn't that benzyl alchol? They have the same freezing point?

Ok I checked yeah it seems they have similar freezing point

 

[Exhortae]

Isn't that benzyl alchol? They have the same freezing point?

Ok I checked yeah it seems they have similar freezing point

Benzyl alcohol is supposed to freeze at -15°C. And it has this specific smell (like flowery).

Benzyl Benzoate on the other hand is supposed to freeze at 18°C.

I used this benzyl benzoate a long time ago in a brew and this is what Jano detected in the purity test of the brew.

0.551 might be benzyl alcohol

Very strange. Very strange that this BB is not freezing in the fridge (and my fridge is cold yes)

 

[Sampei]

Benzyl alcohol is supposed to freeze at -15°C. And it has this specific smell (like flowery).

Benzyl Benzoate on the other hand is supposed to freeze at 18°C.

I used this benzyl benzoate a long time ago in a brew and this is what Jano detected in the purity test of the brew.

0.551 might be benzyl alcohol

Very strange. Very strange that this BB is not freezing in the fridge (and my fridge is cold yes)


View attachment 318872

Is it USP/Ph.eur/BP Benzyl Benzoate?

 

[readalot]

Great thread and I always really enjoy the technical details you bring to the thread. Long story short, BB is hard to freeze and can supercool efficiently given its molecular structure. Look at its boiling point. Intermolecular forces, works like a champ for pushing AAS esters into oil, thermo, shut up readalot, etc, etc. I mean that's why it's used for AAS, to create supersaturated solutions of AAS esters in oil.

So throw it in the freezer and still might take a while. And of course you can always test it but the issues you are describing doesn't mean it isn't pure BB.

Some more details here....

https://basenotes.com/community/threads/benzyl-benzoate.320077/

 

[readalot]

a little more:

Supercooling - Wikipedia

en.m.wikipedia.org

NB:

Supercooling should not be confused with freezing-point depression. Supercooling is the cooling of a liquid below its freezing point without it becoming solid. Freezing point depression is when a solution can be cooled below the freezing point of the corresponding pure liquid due to the presence of the solute; an example of this is the freezing point depression that occurs when salt is added to pure water.

 

[Exhortae]

Is it USP/Ph.eur/BP Benzyl Benzoate?

Says BP. But for reasearch only

 

[Exhortae]

Great thread and I always really enjoy the technical details you bring to the thread. Long story short, BB is hard to freeze and can supercool efficiently given its molecular structure. Look at its boiling point. Intermolecular forces, works like a champ for pushing AAS esters into oil, thermo, shut up readalot, etc, etc. I mean that's why it's used for AAS, to create supersaturated solutions of AAS esters in oil.

So throw it in the freezer and still might take a while. And of course you can always test it but the issues you are describing doesn't mean it isn't pure BB.

Some more details here....

https://basenotes.com/community/threads/benzyl-benzoate.320077/

Well it's been 2 hours in the freeze at -20° C and it still didn't freeze. I tried to stir it with a glass rod nothing happened.

Stangely when I asked chatgpt it said BB was less likely to supercool, but now your explanation makes sense. Thank you

 

[readalot]

Well it's been 2 hours in the freeze at -20° C and it still didn't freeze. I tried to stir it with a glass rod nothing happened.

Stangely when I asked chatgpt it said BB was less likely to supercool, but now your explanation makes sense. Thank you

The BB is very pure and needs a nucleating agent...

Nucleation - Wikipedia

en.m.wikipedia.org

Maybe the glass rod will work if it wasnt clean enough. Maybe a few crystals of Test C and then throw back in freezer?

Non equilibrium thermo is so fascinating. Thanks for the thread.

 

[Sampei]

The BB is very pure and needs a nucleating agent...

Nucleation - Wikipedia

en.m.wikipedia.org

Maybe the glass rod will work if it wasnt clean enough. Maybe a few crystals of Test C and then throw back in freezer?

Non equilibrium thermo is so fascinating. Thanks for the thread.

If I keep my BB and BA in the fridge, would it help to prolong the shelf life? Any possible drawback?

 

[readalot]

If I keep my BB and BA in the fridge, would it help to prolong the shelf life? Any possible drawback?

The BB will freeze at some point. BA won't. So sure lowering the temp will significantly decrease decomposition reactions but if you are using it within a couple of years probably more trouble than its worth. How long you wanna store for?

 

[buck]

If I keep my BB and BA in the fridge, would it help to prolong the shelf life? Any possible drawback?

As the recommended temp per most manufacturers is room temp i see no benefit. The condensation from the frig door opening and closing might be something to consider. But i just store mine with my powders in a cooler in a dark closet. And that has worked well for me for over 20 years.

 

[Sampei]

The BB will freeze at some point. BA won't. So sure lowering the temp will significantly decrease decomposition reactions but if you are using it within a couple of years probably more trouble than its worth. How long you wanna store for?

I just bought a tad bit too much of BA but I mean it's not a big deal, I'll just buy more in case, it's not like it's expensive or something

 

[readalot]

I just bought a tad bit too much of BA but I mean it's not a big deal, I'll just buy more in case, it's not like it's expensive or something

Dirty secret: I'm living on the edge and keeping my case of Hospira bac water in a closet, xD.

 

[Sampei]

Dirty secret: I'm living on the edge and keeping my case of Hospira bac water in a closet, xD.

That's where you should store bac water xD

 

[readalot]

That's where you should store bac water xD

My comedy is poor at times. Appreciate your patience.

 

[Exhortae]

After 8 hours at -20°C in the freezer it created a very small crystal.

Grinded that crystal and stirred the benzyl benzoate. Then put it in the fridge at -5°C

Took 20 minutes to completely solidify.

And yes it was supercooling

Purely amazing

 

[readalot]

You are a great scientist @Exhortae! Way to break up that crystal then re-pitch.

 

[Serpes]

You are a great scientist @Exhortae! Way to break up that crystal then re-pitch.

posting in epic thread haha!

 

[Serpes]

Now Exhoarte, the boiling point is what is subject to change, not the temperature required in order to freeze it. This means