How is Sulfuric Acid Made? Manufacture of sulphuric acid in industry:In industry, sulphuric acid is manufactured by Contact process. Sulphur, air or oxygen and water are the raw materials for the manufacture of sulphuric acid. The Contact process consists of three stages: Stage I: Production of sulphur dioxide (Sulphur → Sulphur dioxide) Stage II: Conversion of … [Read more...] about How is Sulfuric Acid Made?