甲苯液相空气氧化过程中[Co2+]/[Co3+]的测定及其对反应的影响

Liquid phase oxidation of toluene is an environmental benign route for the production of benzoic acid. In a mm bubble column reactor, the commercial process of toluene liquid phase oxidation was conducted with Co(CH3COO)2&#8226;4H2O as catalyst. The Co2+ concentration Co2+] was determined by extraction spectrophotometry and hereby the Co3+ concentration Co3+] was obtained by mass balance. The results showed that Co3+] reached the maximum at about 25-30 min. Co3+] increased with increasing Co catalyst amount at total Co concentration <150 mg&#8226;L－1 of toluene. The conversion of toluene, yield and selectivity of benzoic acid increased with the increasing Co3+/Co2+]max. A high Co3+] and a high Co3+]/Co2+] ratio are beneficial to the reaction.

Influences of the [Co2+]/[Co3+] Ratio on the Process of Liquid-phase Oxidation of Toluene by Air

Liquid phase oxidation of toluene is an environmental benign route for the production of benzoic acid. In aφ48 mm bubble column reactor, the commercial process of toluene liquid phase oxidation was conducted with Co(CH3COO)2.4H2o as catalyst. The Co2+ concentration Co2+] was determined by extraction spectrophotometry and hereby the Co3+ concentration Co3+] was obtained by mass balance. The results showed that Co3+] reached the maximum at about 25-30 min. Co3+] increased with increasing Co catalyst amount at total Co concentration <150 mg'L-1 of toluene. The conversion of toluene, yield and selectivity of benzoic acid increased with the increasing Co3+/Co2+]max. A high Co3+] and a high Co3+]/Co2+] ratio are beneficial to the reaction.