Date: Wed, 8 Apr 2009 15:51:57 -0700
Reply-To: Little Helga <littlehelga**At_Symbol_Here**COX.NET>
Sender: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
From: Little Helga <littlehelga**At_Symbol_Here**COX.NET>
Subject: 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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