----- Original Message -----From: Little HelgaSent: Wednesday, April 08, 2009 6:51 PMSubject: [DCHAS-L] Mixtures of Oleum and Perchloric acidDoes 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 SmallRS AssociatesTucson, AZ
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