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PCE
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DIFF Subgroup
C01B 21/38

Nitric acid

Introduced: September 1968

Full Title

Nitrogen; Compounds thereof > Nitrogen oxides; Oxyacids of nitrogen; Salts thereof > Nitric acid

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

Child Classifications

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  • C01B 21/40 Preparation by absorption of oxides of nitrogen IPC+CPC Available in IPC and CPC
  • C01B 21/42 Preparation from nitrates IPC+CPC Available in IPC and CPC
  • C01B 21/44 Concentration IPC+CPC Available in IPC and CPC
  • C01B 21/46 Purification; Separation IPC+CPC Available in IPC and CPC