-
1.发明公开PROCESS FOR THE PRODUCTION OF MELAMINE FROM UREA, AND PARTICULARLY TO OBTAIN MELAMINE-FREE OFF-GAS IN THE FIRST SEPARATION STEP 审中-公开三聚氰胺尿素方法的操作部门，特别是为了获得不含三聚氰胺GAS在第一步中分离
公开(公告)号：EP1504045A1
公开(公告)日：2005-02-09
申请号：EP03749861.5
申请日：2003-04-29
IPC分类号： C08G12/32 , C07D251/60 , B01D53/00
CPC分类号： B01D53/002 , C07D251/60 , C08G12/32
摘要： Treatment of off-gas deriving from the pyrolysis reaction of urea to produce melamine, carried out in liquid phase at a high pressure, wherein the melamine content present in the off-gas is separated by washing the off-gas with a cooling liquid stream which rapidly brings the gaseous mixture to de-sublimation temperatures of the gaseous melamine which separates in solution in said stream, thus obtaining melamine-free off-gas on the one hand, and a fraction of high purity de-sublimated melamine in solution, on the other.
-
公开(公告)号：EP1515957A1
公开(公告)日：2005-03-23
申请号：EP03761570.5
申请日：2003-06-26
IPC分类号： C07D251/60 , C07D251/56 , B01J4/00 , B01J8/00
CPC分类号： B01J19/1806 , B01J19/0013 , B01J2219/00121 , B01J2219/00252 , C07D251/56 , C07D251/60
摘要： Treatment of the pyrolysis product of urea to melamine, in one or more expansion and cooling steps to separate the offgas and recover the melamine in solution/suspension, carried out by expanding the product under a liquid seal, to prevent the melamine crystals in formation from adhering to the internal walls of the equipment.
-
3.发明公开PROCESS FOR THE PRODUCTION OF MELAMINE FROM UREA, AND PARTICULARLY FOR THE SEPARATION OF MELAMINE FROM OFF-GAS 审中-公开用于生产蜜胺尿素，特别是用于分离三聚氰胺从废气
公开(公告)号：EP1487808A1
公开(公告)日：2004-12-22
申请号：EP03709800.1
申请日：2003-03-19
IPC分类号： C07D251/60
CPC分类号： C07D251/60
摘要： Treatment of off-gas deriving from the pyrolysis reaction of urea to produce melamine, carried out in liquid phase at high pressure, wherein the off-gas is mixed with a cooling gaseous fluid, which rapidly cools the gaseous mixture to the de-sublimation temperature of the gaseous melamine which separates as solid phase, thus obtaining off-gas, anhydrous and without melamine, on the one hand and a fraction of high purity de-sublimated melamine, on the other.
-
-
搜索结果
3 条记录 (耗时 0.008 秒)
