| 摘要 |
The invention relates to producing melamine from urea, by catalytically converting the urea at least partially to melamine in a fluidized bed reactor at 350 to 450°C, feeding the gas mixture arising in the reactor, optionally after filtering in a gas filter, into a crystallizer, in which the melamine crystallizes at a reduced temperature, separating and drawing off the melamine from the process gas in a separator, and then recirculating the process gas, and fed into the fluidized-bed reactor as a fluidizing gas after washing in a urea washer, precipitating droplets, and compressing. According to the invention, the process gas is pre-warmed after precipitating the fluid droplets and before entry into the compressor. |
