The Explosives and Weapons Forum
The 1999 Archive
To Mega ( Formaldehyde and acetaldehyde)
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The Explosives and Weapons Forum
The 1999 Archive
To Mega ( Formaldehyde and acetaldehyde)
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This topic was originally posted in this forum: Explosives |
| Author | Topic: To Mega ( Formaldehyde and acetaldehyde) |
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Fjp92 Frequent Poster |
posted December 28, 1999 01:43 AM
 
I will be gratefull if youcan help me on the following. Acording to a text that i have found one can make formaldehyde and acetaldehyde with a process called katalytical dehidrogenation of alcohols . (please excuse my spelling the text was not in english) For formaldehyde methanol is used and for acetaldehyde ethanol. It says that the alkohols is passed over a HOT copper catalist in vapour form. OK Now i have a question. If i take a copper pipe ( thin and very long ) and coil it and the pass the alcohol vapour through it while the coil is being heated very strongly over a gas flame and then distiling the product, will this give me the disired product? |
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dlwdaw Frequent Poster |
posted December 28, 1999 12:39 PM
be careful with gas stove, you could ignite the alcohol vapor..... ------------------ "Tick, tick, tick, tick ...Haa! That fucking shotgun is straight out of Doom" -Eric harris |
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megalomania Administrator |
posted December 28, 1999 01:01 PM
Thats the process I was going to try. I know what process you are describing, but I do not know what form the copper is in. If I were you (and I am going to try this experiment myself someday) I would stuff some copper sponge (available at the grocery store, its a scouring pad) into a copper pipe and hope for the best. Sometimes they use special finly divided powers or micro porus materials, the success of a catalyst is dependant on the available surface area. Pipe has very little surface area, the sponge has a lot more. It all depends on if this reaction is fairly rapid or not. You may need to get the catalyst very hot, similiar to the way it is for nitric acid, glowing red hot. In which case all you need is a bit of copper wire coiled up in a flask, the heat of the reaction would be sufficient to keep it hot. If using the tube, you do need to blast it with a torch to get it very hot. Do be careful, I can not say at which temperature it needs to be, a runaway reaction could occur. ------------------ |
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nbk2000 Moderator |
posted December 29, 1999 01:44 AM
An old posting covers the apparatus needed for this sort of thing. Go to http://theforum.virtualave.net/ubb/Forum1/HTML/000099.html and substitute the aclohols for acetone. The advantage to an electrically heated reactor is even, reproducable heating. If you overheat the alcohols, you'll get gases and steam. ------------------ |
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Fjp92 Frequent Poster |
posted December 29, 1999 02:23 PM
Mega i do not know if the copper sponge that you are talking about will work. The only copper sponge that i know of that is used for scouring is not real copper, it is an alloy(goldish colour) I haved decided that im going to use something other than the coil. i am going to take a thick pipe and then make a in and out let and fill the hole thing with snipperd copper(red colour) whire and let the vapour pass through it. It very pure copper and there will be a hell of a lot of surface area of the copper to be in contact with the vapour. I am real bussy the last few days but i think i will have some results in the next two weeks
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