EP 1140869 A1 20011010 - HIGH-PRESSURE PROCESS FOR THE PREPARATION OF MELAMINE FROM UREA
Title (en)
HIGH-PRESSURE PROCESS FOR THE PREPARATION OF MELAMINE FROM UREA
Title (de)
HOCHDRUCKVERFAHREN ZUR HERSTELLUNG VON MELAMIN AUS HARNSTOFF
Title (fr)
PROCEDE SOUS HAUTE PRESSION POUR LA PREPARATION DE MELAMINE A PARTIR D'UREE
Publication
Application
Priority
- FI 9901090 W 19991229
- FI 982847 A 19981231
Abstract (en)
[origin: WO0040567A1] The invention relates to a process for the preparation of melamine from urea comprising the steps of: (a) introducing urea melt and hot ammonia gas into a melamine reactor having a pressure within the range 50-150 bar and a temperature within the range 360-470 DEG C, to obtain a melamine melt and off-gases; (b) separating said off-gases from said melamine melt; (c) introducing said melamine melt and ammonia gas into an evaporator having a pressure within the range 1-15 bar and a temperature within the range 290-520 DEG C, to obtain a melamine-containing gas mixture; and (d) introducing said melamine-containing gas mixture into a cooler having a pressure within the range 1-15 bar and a temperature within the range 0-250 DEG C, to convert the gaseous melamine to solid high purity melamine.
IPC 1-7
IPC 8 full level
C07D 251/60 (2006.01)
CPC (source: EP)
C07D 251/60 (2013.01)
Citation (search report)
See references of WO 0040567A1
Designated contracting state (EPC)
AT DE FR IT NL
DOCDB simple family (publication)
WO 0040567 A1 20000713; AU 2111800 A 20000724; EP 1140869 A1 20011010; FI 107257 B 20010629; FI 982847 A0 19981231; FI 982847 A 20000701
DOCDB simple family (application)
FI 9901090 W 19991229; AU 2111800 A 19991229; EP 99965593 A 19991229; FI 982847 A 19981231