Hello!

Yes there are like 100000 Threads around which asked for some stuff about naphtha, heptane etc. and the repetition of questions is wide.

But this time I has a question of something, which I simply understand and what is not covered by anything I read so far.


So in Germany we don't have something called *Naphtha*, the correct name here is *Wund Benzin* or *Wasch Benzin* if you buy it in the shops and if you search for the laboratory compound's name then it is *Petrol Ether*

So all this compounds are the same and have an evaporation point of 40-60°C. So waht I understood so far is that you want the strongest evaporating Naphtha as it won't contain any residues when you evap it etc.


And what comes now to my mind:

If 40-60°C is the best kind of Naphtha, then WHY is the use of Hexane worse in terms of yield?


It was said if you go for the YIELD:


Nephtha > Heptane > Hexane


So the lower the boiling point gets, the less the solvent will pull out of your mixture.

Therefore Heptane is still okay, but Hexane is already so bad, that it is only pulling it at VERY HIGH Temperatures (or at least near its boiling point) which makes it only good for recrystalization.

Okay, got this. But then how can this Naphtha (40-60°C) be better than Hexane and Heptane? It has a much lower boiling point as it contains mostly HEXANE and PENTANE.

From what I wrote so far, it must be even worse. I mean Heptane is better than Hexane and Hexane should be better than Pentane. So this means that the Naphtha (40-60°C) must be the worse solvent for pulling out of those 3.

So how can you explain this to me?

May it just be that I misunderstood and the lowest boiling Nephtha is not the best, which means that the best Naphtha boils at ~ 80°C and the 40-60°C Naphtha is pretty shit ? I just thought that all you guys are using the low-boiling one ...

THXXX

Why do you think boiling point has any relation to extraction efficiency?

I think what gives naphtha the high efficiency is the fact it is a mix of solvents.

I once used pure heptane for extraction and it indeed pulls less DMT (though purer), but it's not that bad.

A mix of say heptane and hexane may give better performance, maybe close to naphtha.

But I am not a chemist so here are just my two cents.

Well yes there is no logical aspect that the boiling point has a direct influnce.

But the power to pull DMT is:


Heptane > Hexane > Pentane


And if my Naphtha is a mixture of Hexane and Pentane (which are both worse than Heptane), then why ever would it be better than pure Heptane ?

Where do you have that from?

Geh zu DM und hol dir einfach das Wasch/ Reinigungsbenzin der marke KLAX

Also the 40-60c means BOILING point.
So you still can have heavy hydrocarbs in it that wont evaporate at all.

Generally something like Naptha/ Wundbenzin or boiling point 50-60c means less than nothing.
It doesnt mean anything really. You can have 1 seller who sells the same mix of hydrocarbons as naptha Wundbenzin and or Waschbenzin.


Just go with stuff you know that works. Like the one i said up there ^

I just bought the cheapest lightest one i could get and distilled it.

And also something like "pull strenght" is hard to determine for mixtures. So when you mix water with ethanol you cant really predict how well salt is gonna dissolve for a given water ethanol % mix.

Just get the cheapest "naptha" that has low benzene content and you will be fine.
You can recycle it easy by freezing out the dmt and reusing it.
I used like 50ml of naptha for 5g of dmt.

A mix of solvents can have higher efficienty than each of the components.

I would not be suprised by that. Look at azeotropes for example. Azeotropic mixture can have a lower boiling point than each of its components. Then why wouldn't a mix of solvents have higher efficienty at dissolving compounds than each of it's components?

Ok I will stick with the laboratory grade *Naphtha* which I called Petroleum Ether. As it is for laboratory use and not home use as a solvent for fats, it is really pure in that term of not containing too large hydrocarbons.

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