| 3/00 | Recovery of by-products |
| 3/02 | Recovery of by-products of carbon dioxide |
| 3/04 | Recovery of by-products of carbon dioxide Recovery of volatile fermentation products from carbon dioxide |
| 3/06 | Recovery of by-products from beer or wine (C12F 3/02 takes precedence; removal of yeast C12G 1/08) |
| 3/08 | Recovery of by-products from beer or wine (C12F 3/02 takes precedence; removal of yeast C12G 1/08) Recovery of alcohol from press residues or other waste material (from carbon dioxide C12F 3/04) |
| 3/10 | Recovery of by-products from distillery slops |
| 5/00 | Preparation of denatured alcohol |