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

CIESC Journal ›› 2009, Vol. 17 ›› Issue (4): 613-617.

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

唐盛伟, 沈伟, 梁斌

Multi-phases Transfer and Reaction Engineering Laboratory, College of Chemical Engineering, Sichuan University, Chengdu 610065, China

收稿日期:2008-08-01 修回日期:2009-06-15 出版日期:2009-08-28 发布日期:2010-12-30
通讯作者: LIANG Bin, E-mail: liangbin@scu.edu.cn
作者简介:
基金资助:
Supported by the National Natural Science Foundation of China(20576081,20736009);the Ph.D. Programs Foundation of Ministry of Education of China(20070Å10128)

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

TANG Shengwei, SHEN Wei, LIANG Bin

Multi-phases Transfer and Reaction Engineering Laboratory, College of Chemical Engineering, Sichuan University, Chengdu 610065, China

Received:2008-08-01 Revised:2009-06-15 Online:2009-08-28 Published:2010-12-30
Supported by:
Supported by the National Natural Science Foundation of China(20576081,20736009);the Ph.D. Programs Foundation of Ministry of Education of China(20070Å10128)

摘要/Abstract

摘要： Liquid phase oxidation of toluene is an environmental benign route for the production of benzoic acid.In a ø48mm 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.

关键词: toluene, benzoic acid, liquid-phase oxidation, cobaltous acetate

Abstract: Liquid phase oxidation of toluene is an environmental benign route for the production of benzoic acid.In a ø48mm 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.

Key words: toluene, benzoic acid, liquid-phase oxidation, cobaltous acetate

唐盛伟, 沈伟, 梁斌. Influences of the [Co²⁺]/[Co³⁺] Ratio on the Process of Liquid-phase Oxidation of Toluene by Air[J]. CIESC Journal, 2009, 17(4): 613-617.

TANG Shengwei, SHEN Wei, LIANG Bin. Influences of the [Co²⁺]/[Co³⁺] Ratio on the Process of Liquid-phase Oxidation of Toluene by Air[J]. , 2009, 17(4): 613-617.

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

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

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