CPC Main Group
C10G 21/00 Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents (C10G17/00, C10G19/00 take precedence)
6 direct subcodes
Child Classifications
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- C10G 21/02 with two or more solvents, which are introduced or withdrawn separately
- C10G 21/06 characterised by the solvent used
- C10G 21/28 Recovery of used solvent
- C10G 21/30 Controlling or regulating