公开(公告)号：US3657236A

公开(公告)日：1972-04-18

申请号：US3657236D

申请日：1969-11-19

Applicant: BASF AG

Inventor： FROMM HERMANN DIETER ,  LEONHARD KARL WILHELM ,  MOHR RUDOLF ,  SCHWARZMANN MATTHIAS ,  WOEHRLE HORST

IPC: B24B9/14 ,  C07D251/60 ,  C07D55/28

CPC classification number: C07D251/60

Abstract: TO PRODUCE MELAMINE, UREA AND/OR ITS THERMAL DECOMPOSITION PRODUCTS ARE REACTED AT 220* TO 400*C. IN CONTACT WITH AN ALUMINUM OXIDE HAVING A LARGE SURFACE AREA IN THE PRESENCE OF AMMONIA. THE ALUMINUM OXIDE USED HAS BEEN OBTAINED BY TREATMENT OF HYDROXIDES OF ALUMINUM (WHICH HAVE NOT BEEN PREVIOUSLY CALCINED) WITH UREA AND/OR ITS THERMAL DECOMPOSITION PRODUCTS AT TEMPERATURES OF FROM 150* TO 400*C. THE AVERAGE OF ALUMINUM OXIDE ACTIVATED IN THIS MANNER OVER ALUMINUM OXIDE OBTAINED BY CALCINING ALUMINUM HYDROXIDE CONSIST IN INCREASED UREA CONVERSION AND GREATER ATTRITION RESISTANCE.