Sulfur Trioxide and Oleum
نویسنده
چکیده
Sulfur trioxide (SO3) and oleums are generally aggressive materials with complicated properties. They are widely used in the process industries. Their main feature is the violent reaction of SO3 and water that occurs in both the liquid and the vapor phase. Oleum (or fuming sulfuric acid) is a solution of sulfur trioxide in 100% sulfuric acid. Its strength is expressed as weight percentage free SO3; thus 30% oleum contains 30% SO3 and 70% H2SO4 by weight. The most commonly industrially used strengths are 65%, 30%, and 20% oleum; their hazardous potential increases with increasing strength.
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