| 摘要 |
PURPOSE:In preparing melamine from urea or its thermal decomposition product, to reuse a recovered catalyst as a reaction catalyst, by removing a bulky material from the recovered catalyst dropped and accumulated at the bottom of the porous plate of a reactor, using the prepared granular or powdery solid acid catalyst directly as the reaction catalyst. CONSTITUTION:In preparing melamine from urea and/or its thermal decomposition product by a fluidized bed reaction in an ammonia atmosphere in the presence of a granular or powdery solid acid catalyst, the porous plate 2 is set at the bottom 6 of the reactor, a bulky material is removed from the recovered catalyst accumulated at the bottom, and the prepared granular or powdery solid acid catalyst is directly reused without regenerating it. EFFECT:Preparation process can be simplified and a unit of catalyst is improved.
|
