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Liquid phase oxidation of toluene is an environmental benign route for the production of benzoic acid.In a φ48mm 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 25-30min.[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.
Liquid phase oxidation of toluene is an environmental benign route for the production of benzoic acid. In a φ48 mm bubble column reactor, the commercial process of toluene liquid phase oxidation was conducted with Co (CH 3 COO) 2.4H 2 O as catalyst. The Co 2+ concentration [Co 2+] 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 increase [Co3 + / Co2 +] max.A high [Co3 +] and a high [Co3 +] / [Co2 +] ratio are beneficial to the reaction.