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Endlessness
Nexus Refugee

Registered: 07/21/07
Posts: 272
Last seen: 3 years, 10 months
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Extraction Solvent question
#8043390 - 02/19/08 03:48 PM (15 years, 11 months ago) |
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Hey!
SWIM is going to make a first extraction, and just bought the materials, including the solvent
There were 2 possible solvents in the chemicals supply store, Naphtha and petroleum ether.. SWIM did not get to see the label of the petroleum ether, and since SWIM remembered most people talking about naphtha in the techniques, SWIM went for it
So anyways, later looking at the label of the naphta, it had the following information: 5 to 8 carbon groups, less than 1% of benzene
SWIM looked up benzene and saw it is a carcinogenic solvent.
Did SWIM get the right thing, or is this particular naphtha SWIM has access to undesirably impure? Or can there be more impurities not written on the label that make more difference? Is this 1% benzene something very unwanted, or is it ok?
Is petroleum ether something more desirable, or it depends on the maker and so on?
Its sort of confusing because all around the net SWIM tried to find info on this and there seems to be no straight answer. Someone on some forum says naphtha leaves impurities when evaporated and that petroleum ether is better. In many other places, naphtha is written as the equivalent of petroleum ether. Also, some people say that there are just about as many naphtha types as there are producers of it, and that some are good some are bad.
SWIM could call the store that sold the solvent and ask questions.. Is there any question SWIM could ask them about the purity or whatever that would help?
Edited by Endlessness (02/19/08 03:50 PM)
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Mushouse
Mycomancer

Registered: 06/26/06
Posts: 500
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Re: Extraction Solvent question [Re: Endlessness]
#8043410 - 02/19/08 03:54 PM (15 years, 11 months ago) |
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You will have better luck with your questions in the chemistry forum.
Also, what is being extracted from what?
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RipVanWinkle
The Benzodiazethang




Registered: 06/11/06
Posts: 4,700
Loc: Near Memphrica, TN
Last seen: 2 years, 2 months
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Re: Extraction Solvent question [Re: Endlessness]
#8043420 - 02/19/08 03:59 PM (15 years, 11 months ago) |
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I'm not too knowledgeable about the Naptha because I could never find any around where I am (not that I looked real hard...)
BUT
I found that an excellent solvent to use is Heptane. It is sold as rubber cement remover at hobby stores, and always worked wonderfully for me. So if you decide not to use what you have now, I'd suggest going for the Heptane. If I remember correctly it was a bit expensive though...
-------------------- Those who danced were thought to be quite insane by those who could not hear the music.
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Endlessness
Nexus Refugee

Registered: 07/21/07
Posts: 272
Last seen: 3 years, 10 months
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Re: Extraction Solvent question [Re: RipVanWinkle]
#8043439 - 02/19/08 04:04 PM (15 years, 11 months ago) |
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extraction is of spice from mimosa.. I just posted there, thanks.. hope its not too much of a problem to have posted it again, if moderators think so, feel free to delete here 
thanks for the tip, I´ll see if I can find what the local heptane name is
more answers always welcome
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TheShroomJew23
The Chemist


Registered: 11/29/07
Posts: 1,611
Loc: Temple
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Re: Extraction Solvent question [Re: RipVanWinkle]
#8043445 - 02/19/08 04:07 PM (15 years, 11 months ago) |
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Naphtha is what you want ether leaves a residue and is not the best solevent(funky smell on finished product). If SWIM is making crystal DMT like I think he is then when you evaporate the solvent at the end the benzene evaporates too. If the Naphtha(benzene included) didnt full evap. then your final product wouldnt come out as cyrstals. When SWIM does it here his crystals come out as clear as glass and with a extremely visible crystaline structure.
--------------------
 You will be missed
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Endlessness
Nexus Refugee

Registered: 07/21/07
Posts: 272
Last seen: 3 years, 10 months
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thanks very much, thats exactly what I wanted to know
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jizmaster

Registered: 02/04/08
Posts: 346
Last seen: 9 years, 4 months
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Re: Extraction Solvent question [Re: Endlessness]
#8044445 - 02/19/08 07:52 PM (15 years, 11 months ago) |
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If you got it from a chem supply it will evaporate cleanly, it's intended to be used for extracting things. Most of the crap sold as lighter fluid, here at least, leaves a greasy residue, since it's intended for burning!
If someone says a solvent leaves a residue they mean the brand of that solvent that they have leaves a residue. Pure solvents leave no residue but solvents sold as lighter fluid, paint thinner etc don't need to be pure and often do leave residue.
The label means it's a mixture of substances having between 5 and 8 carbon atoms. Heptane has 7, so you have some of that in there. Benzene has 6 so it's hard to get out completely which is why you have 1% or less in there.
Petroleum ether should have a pair of numbers after the name, such as 40-60 or 60-80. This is the boiling point, 40-60 means if you heat it to boiling it will start at 40 degrees C and rise as it evaporates. By 60 degrees it will be completely evaporated. You might as well get the lowest boiling stuff you can get since it is easier to evaporate.(but more of a fire hazard!)
The naphtha you have i expect would boil between 40 and 90 or 100 degrees C.
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