公开(公告)号：GB1030587A

公开(公告)日：1966-05-25

申请号：GB1650865

申请日：1965-04-20

Applicant: BASF AG

Inventor： HAMPRECHT GUENTHER ,  ROTHER EBERHARD ,  SCHWARZMANN MATTHIAS ,  FROMM HERMAN N DIETER

IPC: B01J21/04 ,  B01J21/16

Abstract: Melamine is made by heating urea, and/or its thermal decomposition products, at 300-450 DEG C. in the presence of added ammonia or gas containing ammonia and a catalyst comprising aluminium oxide which has been prepared by calcining bohmite, bayerite, hydrargyllite or a mixture thereof at 700-1000 DEG C. The added ammonia may be in the form of the off-gas containing CO2 which is obtained after removing melamine from the reaction gases. The catalyst may be regenerated by treatment with ammonia at elevated temperatures. The process is effected in a continuous manner. The examples relate to a catalyst obtained by calcining a mixture of bohmite and bayerite.