CPC Subgroup
C01B 17/69 Sulfur trioxide; Sulfuric acid
Full Title
Sulfur; Compounds thereof > Sulfur trioxide; Sulfuric acid
4 direct subcodes
Child Classifications
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- C01B 17/70 Stabilisation of gamma-form sulfur trioxide
- C01B 17/74 Preparation
- C01B 17/88 Concentration of sulfuric acid
- C01B 17/90 Separation; Purification