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Subject: Re: Mixtures of Oleum and Perchloric acid
Date: Thu, 9 Apr 2009 14:56:51 -0400
Author: Mark Mellum 		Next by Date:
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Date: Thu, 9 Apr 2009 19:40:14 -0400
Author: List Moderator


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.

__________________________________________________
Mikhail

From: DCHAS-L Discussion List [mailto:DCHAS-L**At_Symbol_Here**list.uvm.edu] 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

 

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