| 摘要 |
<p>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*(rho¿p?*g*dp?2/eta¿g) m/s, where: Preactor stands for the pressure in the reactor's synthesis zone in MPa and T for the reactor temperature in °C and where: rhop = density of catalyst particle in kg/m3 dp = average (Sauter) diameter of the catalyst in m etag = dynamic viscosity of the gas in Pa.s g = 9.8 m/s2.</p> |
