| 585 / | HD | CHEMISTRY OF HYDROCARBON COMPOUNDS |
| 800 | DF | PURIFICATION, SEPARATION, OR RECOVERY {7} |
| 820 | DF | .~ By contact with solid sorbent {7} |
| 826 | DF | .~.~ With specified sorbent rehabilitation procedure or agent, e.g., desorbent, etc. {2} |
| 829 | ![]() | .~.~.~ Unsaturated sorbate |