Contact Process
| Formula / Notation | 2SO₂+O₂⇌2SO₃ (V₂O₅, 450°C); SO₃+H₂SO₄→H₂S₂O₇+H₂O→2H₂SO₄ |
|---|---|
| Also Known As | Sulfuric acid manufacturing process, V₂O₅ catalytic oxidation process |
What is Contact Process?
The Contact Process is the industrial method for manufacturing sulfuric acid (H₂SO₄). It involves: (1) burning sulfur or roasting metal sulfides to form SO₂, (2) catalytic oxidation of SO₂ to SO₃ over a vanadium pentoxide catalyst at 450°C, and (3) absorption of SO₃ in concentrated H₂SO₄ to form oleum, then dilution with water. It is one of the most important industrial chemical processes.
Formula & Notation
Other Names / Synonyms: Sulfuric acid manufacturing process, V₂O₅ catalytic oxidation process
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
The Contact Process is the industrial method for manufacturing sulfuric acid (H₂SO₄). It involves: (1) burning sulfur or roasting metal sulfides to form SO₂, (2) catalytic oxidation of SO₂ to SO₃ over a vanadium pentoxide catalyst at 450°C, and (3) absorption of SO₃ in concentrated H₂SO₄ to form oleum, then dilution with water. It is one of the most important industrial chemical processes.
Sulfuric acid produced by the Contact process is the world's largest-volume industrial chemical, used in fertiliser manufacture (superphosphate, ammonium sulfate), petrochemical refining, metal processing (pickling), explosives, and battery electrolyte.
SO₂ and SO₃ are toxic and corrosive gases that cause severe respiratory damage. Concentrated sulfuric acid is highly corrosive with a high affinity for water (exothermic dilution — always add acid to water). Contact process plants require comprehensive gas containment and scrubbing systems.
The formula or notation for Contact Process is: 2SO₂+O₂⇌2SO₃ (V₂O₅, 450°C); SO₃+H₂SO₄→H₂S₂O₇+H₂O→2H₂SO₄