公开(公告)号：US3499794A

公开(公告)日：1970-03-10

申请号：US3499794D

申请日：1968-04-23

Applicant: BASF AG

Inventor： FROMM HERMANN DIETER ,  SCHWARZMANN MATTHIAS ,  VOGEL LUDWIG ,  WIDMANN ALFRED

IPC: C07C273/16 ,  C23G1/28 ,  B08B3/08

CPC classification number: C07C273/16

公开(公告)号：US3895007A

公开(公告)日：1975-07-15

申请号：US35309973

申请日：1973-04-20

Applicant: BASF AG

Inventor： SCHWARZMANN MATTHIAS ,  WIDMANN ALFRED ,  VOGEL LUDWIG ,  FROMM DIETER

IPC: C07D251/60 ,  C07D20060101 ,  C07D55/28

CPC classification number: C07D251/60

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.

Abstract translation: 通过尿素热裂解从尿素催化制备三聚氰胺，并在催化剂存在下将产生的裂化气转化为三聚氰胺。 热分解在流化床中进行，所需的热量由位于流化床中的热交换器施加。 裂化气体转化为三聚氰胺在同一流化床中进行，在这种情况下，流化固体由常规催化剂组成，或在远离所述流化床的反应区中。 在后一种情况下，固体流化由催化非活性颗粒组成，转化是在催化剂存在下在远离流化床的所述反应区中进行的。 在这两种情况下，尿素在热交换器上方的一点加入流化床。