Date: Thu, 9 Apr 2009 15:51:08 -0700
Reply-To: "Alnajjar, Mikhail S" <ms.alnajjar**At_Symbol_Here**PNL.GOV>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: "Alnajjar, Mikhail S" <ms.alnajjar**At_Symbol_Here**PNL.GOV>
Subject: Re: Mixtures of Oleum and Perchloric acid
Comments: To: "Dr. Jay A. Young"
In-Reply-To: A<84D89DEB522244C1AFE7136B384D3AFA**At_Symbol_Here**chemical6df00a>

Be careful like Jay said.  Well, Oleum is extremely hygroscopic.  Extreme caution must be exercised.  It must be diluted only with approximately 96 % sulfuric acid and not with water.  Oleum plus water = violent reaction.  It is used in the production of explosives (e.g. in multiple nitration of aromatics). Oleum is very strong dehydrating agent.


From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**] On Behalf Of Dr. Jay A. Young
Sent: Thursday, April 09, 2009 12:59 PM
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: Re: [DCHAS-L] Mixtures of Oleum and Perchloric acid

Whether or not you mix 70% perchloric acid with Oleum in any proportions depends on your desire or reluctance to make (if you are a male) your wife a widow.


Very few males have such intentions.  I recommend that you follow their example.


Jay Young


PS: In case you have missed my point--DON'T MIX!


----- Original Message -----

From: Little Helga

To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU

Sent:< /b> Wednesday, April 08, 2009 6:51 PM

Subject: [DCHAS-L] Mixtures of Oleum and Perchloric acid

Does anyone know of a potential hazard of mixing 70% perchloric acid with oleum (% SO3 to react with most of the water in the perchloric acid).


The research group is trying to make ~100% sulfuric acid and ~100% perchloric acid to oxidize small quanities of carbon (graphite) at temperatures ranging up to 70 C. The group understands the usual problems with handling oleum and they know that 100% perchloric acid by its self is a major safety problem.


Concentrations of the "100% perchloric acid" would be in the range of 10 to 30% in the oleum.


Bob Small

RS Associates

Tucson, AZ


Previous post   |  Top of Page   |   Next post

The content of this page reflects the personal opinion(s) of the author(s) only, not the American Chemical Society, ILPI, Safety Emporium, or any other party. Use of any information on this page is at the reader's own risk. Unauthorized reproduction of these materials is prohibited. Send questions/comments about the archive to
The maintenance and hosting of the DCHAS-L archive is provided through the generous support of Safety Emporium.