Properties
Sulfuric acid (CAS Number: 7664-93-9) is a mineral acid composed of sulfur oxygen and hydrogen. It is also known as sulphuric acid and vitriol. The chemical formula of the compound is H2SO4. It is a colorless and odorless hygroscopic liquid, which soluble in water. It is a highly corrosive acid, which possesses oxidizing and dehydrating properties.
Production
Sulfuric acid manufacturers manufacture the compound from sulfur, oxygen and water through thecontact processor the wet sulfuric acid process.
Contact Process
The process begins with the burning of sulfur to sulfur dioxide.
S+ O2→ SO2
Sulfur dioxide is oxidized to sulfur trioxide with oxygen along with vanadium (V) oxide catalyst. It is a reversible exothermic reaction.
2SO2+ O2 ⇌ 2SO3
Sulfur trioxide gets absorbed in 97%-98% H2SO4 to produce oleum, which is also known as fuming acid.
H2SO4 + SO3 → H2S2O7
Sulfuric acid is produced through dilution of oleum with water.
H2S2O7 + H2O→ 2 H2SO4
Wet Sulfuric Acid Process
In this process, sulfur is burned to produce sulfur dioxide.
S+O2→SO2
Sulfur dioxide obtained is oxidized to sulfur trioxide using oxygen in the presence of vanadium(V) oxide as catalyst.
2 SO2 + O2⇌2 SO3
Sulfur trioxide is then hydrated to form sulfuric acid.
SO3 + H2O → H2SO4
Applications
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Fertilizer manufacturing companies buy sulfuric acid for the manufacture of ammonium phosphate, superphosphates and ammonium sulfates. Sulfuric acid manufacturers and sulfuric acid suppliers supply the chemical to industries that manufacture dyestuffs, insecticides, pharmaceuticals, synthetic resins, antifreeze, petroleum catalysts and detergents.
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Iron and steel making industries buy sulfuric acid in large quantities to remove rust, oxidation and scaling from billets and rolled sheet before selling to the automobile industry and appliances industry.Sulfuric acid suppliers supply the chemical as a catalyst for the conversion of cyclohexanone oxime to caprolactam, which is used in the manufacture of nylon.
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Sulfuric acid suppliers also see it for the manufacture of hydrochloric acid from salt through the Mannheim process.Petroleum refining industries buy sulfuric acid for raising the octane rating of petrol. Industries buy sulfuric acid and use it as an oxidizing agent or dehydrating agent in industrial reactions like dehydration of numerous sugars to form solid carbon.
Toxicity
Exposure to sulfuric acid can cause pain, irritation, redness, burns, corneal damage, drying and cracking of skin. At high concentrations it could result in permanent blindness, severe injury or death. It can aggravate asthma and pulmonary disease such as bronchitis and emphysema. Sulfuric acid manufacturers, suppliers, intermediate and end users must be aware of the toxicity of the compound.
Handling and Storage
Appropriate personal protection equipment must be worn by factory personnel handling sulfuric acid. The chemical should be kept away from sources of ignition during storage, handling and transportation. Sulfuric acid manufacturers, sulfuric acid suppliers and industries that buy sulfuric acid must store it in a non-reactive container away from water sources.
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