208 / | HD | MINERAL OILS: PROCESSES AND PRODUCTS |
177 | DF | REFINING {23} |
208 R | DF | .~ Sulfur removal (free or combined sulfur) {17} |
226 | DF | .~.~ With alkali or alkali earth metal compound (except clays) {4} |
230 | DF | .~.~.~ Alkali metal compound {2} |
231 | DF | .~.~.~.~ With added oxygen containing organic compound {2} |
232 | .~.~.~.~.~ Alcohol containing {1} | |
233 | DF | .~.~.~.~.~.~> With other organic compound |