| 502 / | HD | CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING |
| 20 | DF | REGENERATING OR REHABILITATING CATALYST OR SORBENT {4} |
| 34 | DF | .~ Gas or vapor treating {5} |
| 35 | DF | .~.~ Using halogen containing substance including liquids vaporizable upon contacting spent catalyst or sorbent {2} |
| 36 | | .~.~.~ Fluorine containing |