| 210 / | HD | LIQUID PURIFICATION OR SEPARATION |
|
| 600 | DF | PROCESSES {14} |
| 634 | DF | .~ Liquid/liquid solvent or colloidal extraction or diffusing or passing through septum selective as to material of a component of liquid; such diffusing or passing being effected by other than only an ion exchange or sorption process {11} |
| 649 | DF | .~.~ Diffusing or passing through septum selective as to material of a component of liquid {1} |
| 650 | DF | .~.~.~ Filtering through membrane (e.g., ultrafiltration) {2} |
| 652 | DF | .~.~.~.~ Hyperfiltration (e.g., reverse osmosis, etc.) {1} |
| 653 | DF | .~.~.~.~.~ Utilizing specified membrane material {2} |
| 655 |  | .~.~.~.~.~.~ Cellulosic |