公开(公告)号：GB1092662A

公开(公告)日：1967-11-29

申请号：GB1286365

申请日：1965-03-26

Applicant: BASF AG

Inventor： HAMPRECHT GUENTHER ,  VOGEL LUDWIG ,  SCHWARZMANN MATTHIAS ,  MOHR RUDOLPH

IPC: C01C3/14 ,  C07D251/60 ,  F26B3/00

Abstract: Melamine is prepared by the thermal cracking of urea at 350 DEG to 550 DEG C. in a first stage and subsequent reaction of the cracked gas at 330 DEG to 450 DEG C. in the presence of a catalyst in a second stage, in which the urea starting material is vaporized in the first stage from a finely divided form by direct heat exchange with cracked gas from the first stage or off-gas from the second stage which has been freed from melamine and both of which have been heated up to a temperature of 350 DEG to 550 DEG C.

公开(公告)号：CA854204A

公开(公告)日：1970-10-20

申请号：CA854204D

Applicant: BASF AG

Inventor： MOHR RUDOLPH ,  WOEHRLE HORST ,  LEONHARD KARL W ,  FROMM HERMANN D ,  SCHWARZMANN MATTHIAS