502 / | HD | CATALYST, SOLID SORBENT, OR SUPPORT THEREFOR: PRODUCT OR PROCESS OF MAKING |
20 | DF | REGENERATING OR REHABILITATING CATALYST OR SORBENT {4} |
22 | DF | .~ Treating with a liquid or treating in a liquid phase, including dissolved or suspended {5} |
23 | .~.~ "Wet air combustion" oxidation of material submerged in liquid |