CPC Subgroup
C01B 21/38 Nitric acid
Full Title
Nitrogen; Compounds thereof > Nitrogen oxides; Oxyacids of nitrogen; Salts thereof > Nitric acid
4 direct subcodes
Child Classifications
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- C01B 21/40 Preparation by absorption of oxides of nitrogen
- C01B 21/42 Preparation from nitrates
- C01B 21/44 Concentration
- C01B 21/46 Purification; Separation