ReconRabbit
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Is urea hydrochloride adduct real?
I got into something of an argument with some Wikipedia editors recently over the existence of urea hydrochloride. There is plenty of evidence,
crystallographic and otherwise, that there exists the protonated forms of urea nitrate, sulfate, and phosphate, but there is very little information
about urea hydrochloride/chlorate. The most recent document I can find is from 1936 regarding synthesis and it is very vague about the identity of the
product: https://doi.org/10.1021%2Fie50317a003
I am considering trying to do a titration but don't know how I would do a good analysis of any solid that came out of it. Is this compound real? Would
you just get ammonium chloride and carbon dioxide from a reaction between urea and HCl?
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Precipitates
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Yes.
From this patent:
"Preparation of Urea Hydrochloride
Urea is weakly basic, forming salts with strong acids. Urea hydrochloride is a salt formed from the simple mixture of urea with hydrochloric acid.
Common urea hydrochloride salts include the 1:1 urea to hydrochloric acid salt (CAS 506-89-8), and the 1:2 urea to hydrochloric acid salt. The 1:1
urea hydrochloric acid salt is sold by Esprit Chemical Company (Rockland, Mass.). Any desired ratio of urea to hydrochloric acid that performs the
desired function can be prepared by simply mixing the appropriate ratios of components, typically in water. The mixing of urea with hydrochloric acid
typically results in a slight exotherm that should be handled with care."
The patent goes on to provide further details, and give examples of ways to prepare the salt.
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ReconRabbit
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I found that specific patent and others contemporaneous with it. Was told that patents are "poor sources" and that the procedures are never actually
tested. As if there weren't dozens of household and commercial mixtures that list "urea hydrochloride" as an active component on their safety data
sheets and the chemical is a restricted medical substance under several state regulations.
[Edited on 11-7-2024 by ReconRabbit]
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bnull
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Mood: Sleepy (again)
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More stuff:
IR spectrum of urea hydrochloride as measured by Coblentz Society, Inc.
G. J. Burrows, "On the hydrolysis of urea hydrochloride", https://doi.org/10.5962/p.359751.
J.-C. Munoz et al., "Effects of catalysts and post-curing conditions in the polymer network of epoxy and phenolic resins: Preliminary results",
https://doi.org/10.1016/j.jmatprotec.2007.10.025 (here in case the link is unavailable).
J. W. Tucker, S. Mizrahi, S. Seltzer, "Scanning electron microscopic study of the efficacy of various irrigating solutions: urea, Tubulicid Red,
and Tubulicid Blue", https://www.jendodon.com/article/S0099-2399(76)80200-2/abstr....
Quod scripsi, scripsi.
B. N. Ull
P.S.: Did you know that we have a Library?
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