PROCESS FOR THE PRODUCTION OF MELAMINE FROM UREA

摘要

Process for the production of melamine from urea by causing urea or thermal decomposition products thereof to react at elevated temperature in the presence of a catalyst in fluidised condition, the melamine vapour pressure in the reactor being less than (5.3+9*ln[(1.5*Preactor)] *T*10<-5> MPa and the velocity of the gas in part, at least, of the reactor being greater than 0.008*(rhop*g*dp<2>/etag) m/s, where: Preactor stands for the pressure in the reactor's synthesis zone in MPa and T for the reactor temperature in DEG C and where: rhop = density of catalyst particle in kg/m<3> dp = average (Sauter) diameter of the catalyst in m etag = dynamic viscosity of the gas in Pa.s g = 9.8 m/s<2>.