Separation; Purification

Introduced: September 1968

Full Title

Sulfur; Compounds thereof > Sulfur trioxide; Sulfuric acid > Separation; Purification

CPC subdivides this area 4x more granularly than IPC with 5 additional codes.

5 codes are CPC-only extensions.

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C01B 17/901 +3 CPC CPC only CPC only
C01B 17/905 CPC only CPC only
C01B 17/906 CPC only CPC only
C01B 17/907 CPC only CPC only
C01B 17/908 CPC only CPC only
C01B 17/92 Recovery from acid tar or the like +1 CPC IPC+CPC Available in IPC and CPC
C01B 17/94 Recovery from nitration acids IPC+CPC Available in IPC and CPC