Abstract：For development of a new catalysis system for liquid phase oxidation of toluene to improve the selectivity of intermediate products benzaldehyde and benzyl alcohol at appropriate reaction conditions, N-hydroxylphthalimide (NHPI) and N,N′-bis(salicylidene) ethylenediiminocobalt (Co(Salen)) composite were adopted to catalyze the liquid-phase oxidation of toluene with oxygen molecular without any solvent. The effects of the amount of NHPI catalyst and NHPI/Co(Salen) composite catalyst, reaction temperature, reaction time and O2 pressure on the selectivity oxidation of toluene were investigated carefully. The results showed that the conversion of toluene was 13.6%, the selectivity of benzaldehyde and benzyl alcohol were 32.7% and 10.8% respectively, the total selectivity to benzaldehyde, benzyl alcohol and benzoic acid was up to 97.7%, under the optimum conditions of toluene 0.22 mol, NHPI molar fraction 2%, Co(Salen) molar fraction 0.02%, oxygen pressure 1.60 MPa and temperature of 110 ℃ for 2 h.
Zhou Meng,Deng Ying,Yuan Xia et al. Investigation on Process of Liquid-Phase Selectivity Oxidation of Toluene Catalyzed by NHPI and Co(Salen) Composite[J]. 化学反应工程与工艺, 2014, 30(2): 182-187.
