SimpleChemist-238
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Easy source or synthesis of formaldehyde
hello I have a simple question on a easy OTC source of formaldehyde. I don't want to go online to get it but I was hoping someone knows a store bought
solution. I already checked a wiki list on easily found chemicals list and it was not available.
Maybe someone had a easy source or a easy way to make it. thank you.
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Steam
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May this answer your questions!
http://www.sciencemadness.org/talk/viewthread.php?tid=13281
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Tdep
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It is sold under the brand name 'Formalin' as a disinfectant, maybe only to industry however. Although it may be harder to find these days, my grandma
used to run a vet practice and still has litres of this 40% or so solution of formaldehyde lying around. Also talk to med students. They love the
stuff, and I know they still use it as a preservative, at least in Aus.
Speaking of which, if any one can think of a cool thing to do with heaps of formaldehyde? Organic chem isn't my thing though
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plante1999
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plastics, pentaerythritol, methylamines etc
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UnintentionalChaos
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You should be able to make some quite pure hexamine with aqueous ammonia. Not that it is super useful, but you go from two liquids to crystals of an
elaborate cage structure compound.
Department of Redundancy Department - Now with paperwork!
'In organic synthesis, we call decomposition products "crap", however this is not a IUPAC approved nomenclature.' -Nicodem
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Tdep
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It would be cool to see hexamine precipitate (right word?) out of a mixture of two gases. I assume the reaction would look like HCl + NH3?
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Chemosynthesis
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Prec Quote: Originally posted by Tdep  | | It would be cool to see hexamine precipitate (right word?) out of a mixture of two gases. I assume the reaction would look like HCl + NH3?
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Precipitate would be the correct term for a gas phase reaction (and industrially used along with solvent phase reactions), but your reactants would
need to be ammonia and formaldehyde, as there are 6 carbons per four nitrogen in each molecule of hexamine.
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Tdep
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Oh yes, when I said 'look like' I meant that in a pure physical way, where two gases form what looks like a white smoke that is actually a very fine
solid.
I've done this sort of reaction with HCl + ammonia and it was rather nice, so I was just wondering whether the formaldehyde and ammonia gas phase
reaction would look very similar to this.
I already have hexamine, but pentaerythritol sounds interesting. You people are never short of ideas
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SimpleChemist-238
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maybe using a acidic catalyst I can make it from Hexamethylenetetramine. Would the ammonia evolve from the acid or react with it and then so would
distillation work well for separation. I could use sodium bisulfate as the acid so it would not be a liquid or quite as expensive as H2SO4. but there
is still a chance of getting water over in the distillate. but there would be very little.
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bismuthate
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I believe that, if you've ever seen a preserved shark carcass souvenir (probably more popular here in an on the water tourist town), they are put in
formaldehyde.
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Praxichys
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You can make it by running methanol through a very hot copper coil.
https://drive.google.com/file/d/0B_16NzkNoL75T054RHMyNlBzVDA...
I usually buy it because that process is pretty tedious. I got this on ebay:
The apparatus above can also produce acetaldehyde from ethanol, which was its primary use.
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Endo
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Maybe try either using Trioxane (purified from fuel tablets) or de-polymerizing it by using a strong acid.
http://www.sciencemadness.org/talk/viewthread.php?tid=14739
Discusses the trials with conversion to formaldehyde and the purification of Trioxane.
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chemrox
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I love the homebake burner. Could you describe it?
"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
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Scr0t
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In the farm centers here it can be bought by anyone for ~30 euro for 25L, it's not considered a 'suspicious' chemical.
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SimpleChemist-238
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Thank you for the info. The Trioxane methode sound intresting
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Praxichys
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@chemrox -
The burner is pretty simple. It is made entirely of 1/2" standard iron pipe.
The galvanized base has a plug threaded into it. The plug was hammered into the gas inlet T and welded in place to form a gas-tight seal. Epoxy or
even silicone could probably also work.
The T has a hose barb threaded into it with thread tape. The top of the T has a plug threaded into it. The plug has a hole drilled through it to form
the gas jet.
The second T is hammered and welded onto the gas jet plug. The sidearm of this functions as the air inlet. Various attachments can be threaded into
the top to change the flame width. I have attachments all the way up to 2 inches.
The issue with this burner is that it does not work all that well at low settings. It is good for this application since high heat and a large, wide
flame is ideal... but for smaller heating applications, the flame tends to jump into the body of the burner itself at low gas pressures.
Anyway, the threaded side inlet can accept another hose barb and was designed to be attached to an air compressor. This works well and gives a
hellishly tall and roaring flame. This feature is rather useless since it is quite inappropriate for indoor applications.
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SimpleChemist-238
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How did you make the coper coil? It seems like a ok method.
[Edited on 30-9-2014 by SimpleChemist-238]
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katgirl2000
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Formaldehyde and Sharks
| Quote: Originally posted by bismuthate | | I believe that, if you've ever seen a preserved shark carcass souvenir (probably more popular here in an on the water tourist town), they are put in
formaldehyde. |
Hi!
First post here. The preserved shark reference made me chuckle. I'd bet anyone who took 1st yr bio for majors would have the same instant response
as me. My class was so long ago that you had to fight dinosaurs for parking but dissecting the brain for a week coming home at night with dandruff
composed of preserved shark cartilage - perfect olfactory aura!
I've been wanting formaldehyde for dissections I've done here but my main interest is on the energetic floor.
Best!
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100PercentChemistry
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I've seen a couple of videos on YouTube like a copper coil or ketone lamp. At a beach suveneer shops they sell these puffer fish and sharks in a jar
like you guys said but there are pieces of tissue floating around I would just filter it.mProbably formaldehyde
[Edited on 5-30-2016 by 100PercentChemistry]
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Dr.Bob
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You can actually just go to the local mortuary supply shop. :-) I have actually been in one before.
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Orenousername
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I have been trying to convert broken/melted keck clips, which I believe to be polyoxymethylene, into formaldehyde solution (because why not) but I
have not been able to find information on the solubility of formaldehyde vs temperature. I figured since formaldehyde is a gas, it's probably more
soluble in cold water, but wikipedia states that paraformaldehyde is more soluble in hot water (?). I simply cut the keck clips into pieces and put
them in a copper tube and heat it with a torch, then bubble the produced gas into cold water, but the resulting mixture is yellow and has a lot of
white solids in it (paraformaldehyde?) The gases are very irritating and smell plasticy, but I am not familiar with what formaldehyde smells like,
would any of you care to enlighten me?
Lol nerds
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