| 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} |
| 856 | DF | .~.~ S containing {2} |
| 858 | | .~.~.~ Sulfuric acid {1} |
| 859 | DF | .~.~.~.~> Interaction with tertiary olefin |