Invention Grant
- Patent Title: Integrated production of urea and melamine
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Application No.: US15106140Application Date: 2014-12-16
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Publication No.: US09815800B2Publication Date: 2017-11-14
- Inventor: Johannes Henricus Mennen
- Applicant: Stamicarbon B.V.
- Applicant Address: NL Sittard
- Assignee: Stamicarbon B.V.
- Current Assignee: Stamicarbon B.V.
- Current Assignee Address: NL Sittard
- Agency: Morrison & Foerster LLP
- Priority: EP13197863 20131217
- International Application: PCT/NL2014/050863 WO 20141216
- International Announcement: WO2015/093942 WO 20150625
- Main IPC: C07D251/60
- IPC: C07D251/60 ; C07D251/62 ; C07C273/12 ; B01J19/24 ; B01J3/04 ; B01J4/00 ; B01J10/00

Abstract:
Disclosed is a process for the integrated production of urea and melamine. A urea production zone produces a urea synthesis stream comprising urea, water and ammonium carbamate. This stream is subjected to processing, preferably involving stripping, so as to separate an aqueous urea stream from residual dissociated carbamate vapor comprising ammonia, carbon dioxide, and water. The urea is fed to a melamine synthesis zone and subjected to melamine forming conditions so as to form melamine and off-gas comprising carbon dioxide and ammonia. The dissociated carbamate vapor and the melamine off-gas are subjected to combined condensation so as to form a dilute melamine off-gas condensate.
Public/Granted literature
- US20160318883A1 INTEGRATED PRODUCTION OF UREA AND MELAMINE Public/Granted day:2016-11-03
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