| 摘要 |
In a process for the preparation of epsilon -caprolactam by catalytic rearrangement of cyclohexanone-oxime in the gas phase at from 230 DEG to 450 DEG C. over a supported catalyst, containing boron trioxide, in a fluidized bed, wherein the catalyst is removed from the fluidized bed at the rate at which it becomes spent and is treated, in a fluidized state, with gases containing molecular oxygen at from 600 DEG to 900 DEG C., after which boron trioxide or boric acid is added to the fluidized catalyst, at from 300 DEG to 900 DEG C., before the catalyst is returned to the fluidized bed, the improvement that boron trioxide or boric acid of particle size from 0.05 to 1.5 mm is fed to the fluidized catalyst at one or more points.
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