EP 1781626 A2 20070509 - HIGH PRESSURE METHOD FOR PRODUCING PURE MELAMINE IN A VERTICAL REACTOR
Title (en)
HIGH PRESSURE METHOD FOR PRODUCING PURE MELAMINE IN A VERTICAL REACTOR
Title (de)
HOCHDRUCKVERFAHREN ZUR HERSTELLUNG VON REINEM MELAMIN
Title (fr)
PROCEDE HAUTE PRESSION PERMETTANT LA PRODUCTION DE MELAMINE PURE DANS UN REACTEUR DE SYNTHESE VERTICAL
Publication
Application
Priority
- EP 2005008323 W 20050727
- AT 12982004 A 20040729
Abstract (en)
[origin: WO2006013079A2] The invention relates to a high pressure method for producing pure melamine by pyrolyzing urea in a vertical synthesis reactor. The invention is characterized in that the synthesis reactor has three stages vertically arranged above one other, whereby: a) in the first i.e. uppermost stage, the smaller portion of the total amount of urea is introduced into the central tube of a first tank reactor whereby forming a first melamine-containing reaction medium; b) in the second i.e. middle stage, the first melamine-containing reaction medium as well as the larger portion of the total amount of urea is introduced into the central tube of a second tank reactor whereby forming a second melamine-containing reaction medium, after which; c) in the third i.e. lowermost stage, the second melamine-containing reaction medium is introduced into a vertical tubular flow reactor whereby forming a raw melamine melt that is subsequently processed in any manner whereby obtaining pure melamine. This makes it possible to achieve a more uniform conversion of urea, a more mild and corrosion-reducing supply of reaction heat, and for the reaction to be optimally carried out as well as to achieve a complete reaction of the urea in the melamine synthesis reactor. In comparison to other melamine methods, the invention provides a more compact, economical and efficient synthesis of melamine.
IPC 8 full level
C07D 251/60 (2006.01); B01J 19/18 (2006.01); B01J 19/24 (2006.01)
CPC (source: EP US)
B01J 3/042 (2013.01 - EP US); B01J 10/005 (2013.01 - EP US); B01J 19/1862 (2013.01 - EP US); B01J 19/1875 (2013.01 - EP US); B01J 19/1887 (2013.01 - EP US); B01J 19/245 (2013.01 - EP US); B01J 19/246 (2013.01 - EP US); B01J 19/247 (2013.01 - EP US); C07D 251/60 (2013.01 - EP US); B01J 2219/00081 (2013.01 - EP US); B01J 2219/00162 (2013.01 - EP US); B01J 2219/00164 (2013.01 - EP US); Y02P 20/582 (2015.11 - EP US)
Citation (search report)
See references of WO 2006013079A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2006013079 A2 20060209; WO 2006013079 A3 20060316; AR 050275 A1 20061011; AT 414239 B 20061015; AT A12982004 A 20060115; CN 101023065 A 20070822; EP 1781626 A2 20070509; JP 2008508226 A 20080321; MY 140845 A 20100129; RU 2006145379 A 20080910; TW 200621358 A 20060701; US 2007232801 A1 20071004; US 7375223 B2 20080520
DOCDB simple family (application)
EP 2005008323 W 20050727; AR P050103156 A 20050728; AT 12982004 A 20040729; CN 200580025685 A 20050727; EP 05768190 A 20050727; JP 2007523034 A 20050727; MY PI20053423 A 20050726; RU 2006145379 A 20050727; TW 94125925 A 20050729; US 63224605 A 20050727