| 摘要 |
<p>An improved method for the preparation of melamine by the conversion of urea and/or thermal decomposition products thereof. The urea and/or thermal decomposition products are converted to melamine in a fluidized bed of catalytically active material in the presence of a gas mixture containing ammonia and carbon dioxide. The partial pressure of ammonia in the gas mixture in the fluidized bed is maintained at a level of at least 70 kPa, whereby the formation of deamination by-products is susbtantially reduced.</p> |
