IPC Subgroup
C01B 17/9 Separation; Purification
Introduced: September 1968
Last revised: January 2006
Full Title
Sulfur; Compounds thereof > Sulfur trioxide; Sulfuric acid > Separation; Purification
Classification Context
- Section:
- CHEMISTRY; METALLURGY
- Class:
- INORGANIC CHEMISTRY
- Subclass:
- NON-METALLIC ELEMENTS; COMPOUNDS THEREOF
2 direct subcodes
Child Classifications
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- C01B 17/92 Recovery from acid tar or the like
- C01B 17/94 Recovery from nitration acids