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PCE
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DIFF Subgroup
C10G 21/02

with two or more solvents, which are introduced or withdrawn separately

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents > with two or more solvents, which are introduced or withdrawn separately

CPC:

Refining of hydrocarbon oils, in the absence of hydrogen, by extraction with selective solvents (C10G17/00, C10G19/00 take precedence) > with two or more solvents, which are introduced or withdrawn separately

IPC and CPC are identically structured here. All 1 subcodes exist in both systems.

Child Classifications

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  • C10G 21/04 by introducing simultaneously at least two immiscible solvents counter-current to each other IPC+CPC Available in IPC and CPC