公开(公告)号：DE2220905A1

公开(公告)日：1973-11-08

申请号：DE2220905

申请日：1972-04-28

Applicant: BASF AG

Inventor： SCHWARZMANN MATTHIAS DR ,  FROMM DIETER DR ,  WIDMANN ALFRED DIPL-ING DR ,  VOGEL LUDWIG DIPL-ING

IPC: C07D251/60 ,  C07D20060101 ,  C07D55/28

Abstract: Catalytic manufacture of melamine from urea by thermal cracking of urea and converting the resulting cracked gases to melamine in the presence of catalysts. The thermal decomposition is carried out in a fluidized bed, the necessary heat being applied by heat exchangers located in the fluidized bed. Conversion of the cracked gases to melamine is effected either in the same fluidized bed, in which case the fluidized solid consists of conventional catalysts, or in a reaction zone remote from said fluidized bed. In the latter case, the solids fluidized consist of catalytically inactive particles, the conversion being carried out in the presence of catalysts in said reaction zone remote from the fluidized bed. In both cases, the urea is fed to the fluidized bed at a point above the heat exchangers.