Patent ID: 7977479
Filing Date: 2011-07-12
Classification: C07D,Y02P

Abstract:
1. A process for producing melamine from urea , which comprises the steps of: (a) feeding a fluidizing gas to a catalytically activated, fluidized bed reactor to create a fluidized bed within the fluidized bed reactor; (b) feeding liquid urea to the fluidized bed of the catalytically activated fluidized bed reactor, said fluidized bed externally heated to a temperature of 380 to 410° C. to decompose the liquid urea into a hot reaction gas containing melamine, ammonia and carbon dioxide; and (c) removing the hot reaction gas from the fluidized bed reactor, and cooling the hot reaction gas in a cooler in heat exchange with the fluidizing gas, prior to introducing the fluidizing gas into the fluidized bed of the catalytically activated, fluidized bed reactor according to step (a), to extract heat from the hot reaction gas and directly transmit the extracted heat to the fluidizing gas to preheat the fluidizing gas required according to step (a), thereby reducing the need to apply external heat to the fluidized bed reactor according to step (b).