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 |