Ammoximation of cyclohexanone with ω(H~2O~2)=30% aqueous hydrogen peroxide and ammonia in the presence of a titanium silicalite (TS-1) catalyst was studied. Decreasing the content of H~2O~2 and increasing the amount of NH~3 in the reaction solution, increase the utilization of H~2O~2 and the yield as well as the selectivity of cyclohexanone to oxime. The favorable reaction time is about 3.5h. The effect of the volume fraction of t-butyl alcohol in the solvent on the ammoximation is discussed in detail. The experiment results show that when the molar ratio of n(NH~3):n(H~2O~2):n(ketone) is 2.0:1.0:1.0, the volume fraction of t-butyl alcohol is 0.5, and the reaction time is 2.5h at 353K, the utilization of H~2O~2 and the yield and selectivity of cyclohexanone oxime can reach 95%, 94% and 97% respectively.

Key words: MOLECULAR SIEVE, CATALYTIC OXIDATION, CYCLOHEXANONE, TITANIUM COMPOUNDS, SILICON COMPOUNDS, HYDROGEN PEROXIDE