585 / | HD | CHEMISTRY OF HYDROCARBON COMPOUNDS |
800 | DF | PURIFICATION, SEPARATION, OR RECOVERY {7} |
833 | DF | .~ By addition of extraneous agent, e.g., solvent, etc. {15} |
864 | .~.~ Organic agent {3} | |
865 | DF | .~.~.~> Heterocyclic or polymeric |
866 | DF | .~.~.~> Acid, anhydride, ester or ether |
867 | DF | .~.~.~> Hydrocarbon |