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Author: Subject: Never be complacent around hot conc nitric acid!
B(a)P
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[*] posted on 29-11-2019 at 17:56
Never be complacent around hot conc nitric acid!


This morning I was undertaking a procedure that I have done many times before. It calls for an addition to a conc nitric acid solution at 75 C. I got distracted and didn't hear my temperate alarm and the temp climbed to 88 C - first mistake. As I was short on time I didn't wait for the solution to fully cool - second mistake. I made the addition at about 85 C as soon as the first portion went in I saw the violent bubbling begin. I was just able to turn my back and move about half a metre away before the contents eject into the air with a fine spray landing on my back and a cloud of NOx being released. Because of the nature of the chemicals I was working with I had a coat on and full face respirator with ABEK 2 respirator. I had no idea just how close the procedure was pushing it with that reaction. Thankfully no physical damage (except my coat) and I will never again be so careless!
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j_sum1
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[*] posted on 29-11-2019 at 18:04


Thanks it is the familiarity that gets you. Every time.
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G-Coupled
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[*] posted on 30-11-2019 at 16:24


Them's some harsh reaction conditions - what was the experiment, as a matter of interest?
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chemist1243
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[*] posted on 30-11-2019 at 16:32


that sounds terrifiying. ive made a few energetic materials here and there as well as distilled some nitric acid, but never had any incidents like this. goes to show, just because it hasnt happend doesnt mean it wont.
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B(a)P
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[*] posted on 30-11-2019 at 18:40


Quote: Originally posted by G-Coupled  
Them's some harsh reaction conditions - what was the experiment, as a matter of interest?


Preparation of mercury fulminate. It occurred at the point where I added the ethanol.
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sodium_stearate
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[*] posted on 1-12-2019 at 11:03


Quote: Originally posted by B(a)P  
Quote: Originally posted by G-Coupled  
Them's some harsh reaction conditions - what was the experiment, as a matter of interest?


Preparation of mercury fulminate. It occurred at the point where I added the ethanol.


Seriously? I would recommend reading the account of
the frenchman who blew himself up making mercury
fulminate some time around the 1890s. Many years after the det.
part of his arm was found in the gutter of a building across
the street from where he'd been making that.

So, B(a)P, apparently you've had a minor little
wreck already, and as of right now at least you are still
walking, talking, and writing posts...

FYI: It obviously does not always turn out that way....

Just sayin'......:D

[Edited on 2-12-2019 by sodium_stearate]




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because it is dressed in overalls and it
looks like work" T.A. Edison
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XeonTheMGPony
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[*] posted on 8-1-2020 at 04:00


that seems like a very odd way asking for trouble, for fulminated Mercury I mix the two when some what warm then gently heat till it kicks off, and then allow it to do its thing

but yes attentiveness is the difference between leaving for the day to enjoy ones bed or ending in the morgue!

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