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Author: Subject: White Fuming Nitric Acid
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[*] posted on 12-5-2017 at 20:51
White Fuming Nitric Acid


Hello. I got interested in WFNA, as it has very little info on wikipedia. My current guess on its prep is a nitric acid synthesis without water, and maybe bubbled with air afterward? Or added a little bit of urea? Can someone clarify a little bit? Thanks
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[*] posted on 12-5-2017 at 21:03


There are YT vids on the synthesis. Not dissimilar from making azeotropic NA. Simply distil from sulfuric acid and a dry nitrate.
Red fuming nitric acid occurs is you get any evolution of nitrogen oxides. Then you need to redistil.

But really, why? 68% is suitable for nearly everything. And WFNA is painful to store.

Make in small volumes as you need it.
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[*] posted on 13-5-2017 at 07:36


Quote: Originally posted by j_sum1  
There are YT vids on the synthesis. Not dissimilar from making azeotropic NA. Simply distil from sulfuric acid and a dry nitrate.
Red fuming nitric acid occurs is you get any evolution of nitrogen oxides. Then you need to redistil.

But really, why? 68% is suitable for nearly everything. And WFNA is painful to store.

Make in small volumes as you need it.

I wasn't going to make much, or keep it for very long.

Possible RDX synth.
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[*] posted on 13-5-2017 at 08:55


Before I could get 68% nitric acid OTC, my nitric acid was always WFNA, because I had to make it myself. It's actually not that bad, in my opinion. I just stored it in a dark brown polyethylene bottle and never had a problem. Basically, if you vacuum-distill sulfuric acid and 68% nitric acid, or sulfuric acid and a nitrate salt, you get WFNA. If you distill it without a vacuum, it's less white and more red. Of course, the vapors will destroy just about anything that you'd use to pull a vacuum except an aspirator, so keep that in mind.
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[*] posted on 13-5-2017 at 09:03


I usually distilled KNO3 and H2SO4 without a vacuum to get RFNA and then used a fishtank air pump to blow dry air through it to kick out the NOx until water clear.



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[*] posted on 13-5-2017 at 10:14


Quote: Originally posted by Praxichys  
I usually distilled KNO3 and H2SO4 without a vacuum to get RFNA and then used a fishtank air pump to blow dry air through it to kick out the NOx until water clear.

I have a pump, but really don't want to risk destroying it. I will do that.
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[*] posted on 13-5-2017 at 10:16


I've made WFNA successfully using battery acid boiled down to 90%, fertilizer grade potassium nitrate and a retort. Density measurements showed the concentration to be 95%. The trick is not to overheat the distilling flask, or you'll get RFNA instead.



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[*] posted on 14-5-2017 at 08:40


While we are on the topic of W/RFNA,could someone answer these questions please -http://www.sciencemadness.org/talk/viewthread.php?tid=71219#...
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