| 摘要 |
Disclosed is a process in two or more steps for oxidation of cymenes to aromatic carboxylic acids. Said process comprises a first oxidation step in gas phase with air or molecular oxygen in presence of a nitric acid, Mn(VII), permanganate, Mn(II) and/or Co(II) and/or V2O5 comprising catalyst, follwed by a second oxidation step in liquid phase in presence of a Co/Mn/Br catalyst. |
