Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (3): 604-611.DOI: 10.3724/SP.J.1088.2013.20939

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Fixed-bed process of liquid-phase ammoximation of cyclohexanone over titanosilicates

ZHUO Zuoxi, LIN Longfei, DENG Xiujuan, WANG Yuning, LIU Yueming   

  1. Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, EastChinaNormalUniversity, Shanghai 200062, China
  • Received:2012-09-30 Revised:2012-10-30 Online:2013-04-02 Published:2013-04-03
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (20973064), the National Key Technology R&D Program (2012BAE05B02), the Science and Technology Commission of Shanghai Municipality (12JC1403600), and the Shanghai Leading Academic Discipline Project (B409).

Abstract:

Liquid-phase ammoximation of cyclohexanone to the corresponding oxime was conducted in a fixed-bed reactor over titanium silicalite (TS-1), which was proved to be a feasible and universal process. The primary rules of ammoximation were explored in the fixed-bed reactor system.The initial results indicated that the utilization of H2O2 was enhanced obviously through this mode, which is attributed to successful hydroxylamine generation and smooth contact with ketones. Further investigations of H2O2 reaction behavior showed that the proper weight hourly space velocity of H2O2 and the concentrations of ammonia and ketone both play a key role in highly efficient utilization of H2O2. The cyclohexanone and H2O2 conversion, cyclohexanone-oxime selectivity, and H2O2 efficiency reached 18.7%, 94.7%, 99.5%, and 98.7%, respectively, under the optimum reaction conditions of temperature of 333 K, ammonia concentration higher than 2%, cyclohexanone/H2O2 molar ratio of 5, and WHSV (H2O2)of 0.083h-1 with 85% t-BuOH as solvent.

Key words: cyclohexanone, ammoximation, titanium silicalite, fixed bed, hydrogen peroxide