Patent ID: 6165315
Filing Date: 2000-12-26
Classification: B01D,B01J,C07C

Abstract:
A process for synthesizing urea at an elevated temperature and pressure, comprising:introducing ammonia and carbon dioxide into a reactor, resulting in the formation of a gaseous phase and a liquid phase, wherein the reactor has an internal volume and comprises;a plurality of perforated reactor trays disposed at least substantially transversely across the internal volume thereby defining a plurality of zones, wherein the perforated reactor trays have a center and a periphery, said perforated reactor trays comprising,a perforated region extending over 20-80% of the tray surface proximate with the center of the tray, andat least one liquid riser located proximate with the periphery of the tray and not in axial alignment with the liquid riser in adjacent trays, wherein the liquid riser comprises a tube having a height of 100 to 300 mm located on and depending from an underside of the tray;maintaining a gaseous phase velocity of 2.5-5 m/sec in the perforations of the perforated reactor trays;wherein the velocity of the liquid phase in the liquid riser is between 0.1 to 0.6 m/sec; andwithdrawing a urea-containing product from said internal volume.