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›› 2009, Vol. 43 ›› Issue (2): 23-26.

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Study on Preparation of Benzoic Acid by Catalytic Oxidation of Benzaldehyde

XIE Shui-long1, XIAO Jian1, LIU Xian-zhang1,2   

  1. 1. Xiamen Kimy Biotechnology Co., Ltd., Xiamen 361003, China;2. Institute of Chemical Industry of Forest Products, CAF;National Engineering Lab. for Biomass Chemical Utilization;Key and Open Lab. on Forest Chemical Engineering, SFA, Nanjing 210042, China
  • Received:2008-10-10 Revised:1900-01-01 Online:2009-03-30 Published:2009-03-30

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Abstract: Benzoic acid was prepared by catalytic oxidation of benzaldyde with oxygen in the presence of cobalt chloride hexahydrate. The effects of the reaction temperature, dosage of solvent, catalyst and emulsifier on the yield of benzoic acid were studied. The yield was over 85% at the condition of mass ratio of benzaldehyde, water, emulsifier, and cobalt hexahydrate 75:50:37.5:0.075,reaction temperature 75-80℃, reaction time 6h, oxygen flow rate 0.3 L/min. The yield of benzoic acid was 60%-65% after twice recrystallization with water.

Key words: benzaldehyde, benzoic acid, catalytic oxidation

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