| 摘要 |
The invention relates to a process for the oxidation of toluene in a liquid phase using an oxygen containing gas at a temperature between 120-200 DEG C and a pressure between 2-50 atm in the presence of a catalyst comprising cobalt or manganese as a metal ion further comprising bromide, wherein the amount of metal ion is between 0.2 and 5 wt % with respect to the reaction mixture; the molar ratio of bromide: metal ion is between 0.05 and 4; and whereby the reaction mixture further comprises an organic onium compound in a molar ratio with respect to the metal ion of 0.1 to 4, which compound is able to solubilize the metal ion-bromide complex, whereby the oxidation is carried out in such a way that at least 15 wt % of the converted toluene is benzaldehyde by limitation of the conversion of toluene, whereafter the reaction mixture is subjected to a separation step to separate toluene and benzaldehyde, the toluene being recycled to the reaction mixture. |
