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Manufacture Of Sulphuric Acid By Contact Process

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Published on May 4, 2010

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Sulfuric acid

Sulfuric acid (H2SO4) is a strong, heavy acid with a
density of 1.84 g/cc and a marked tendency to
absorb moisture from the air, generating much heat.
Concentrated sulfuric acid (93-98%) is used in the
manufacture of fertilizers, explosives, dyes, and
petroleum products. Sulfuric acid is formed during the
Contact Process. The Contact Process forms sulfur
trioxide (SO3) gas from sulfur dioxide (SO2) and oxygen
in a catalyst tower, and sulfuric acid is formed
when water is added. A mixture of H2SO4 and free
SO3 is equivalent to a sulfuric acid concentration of
over 100 percent. This mixture is called fuming sulfuric
acid or oleum.

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