Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Reexamination Certificate
2006-07-11
2006-07-11
O'Sullivan, Peter (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
C422S187000, C422S186220, C422S186220, 56, 56, 56, C544S201000
Reexamination Certificate
active
07074958
ABSTRACT:
An integrated process for urea/melamine production. In the process, urea is synthesized from ammonia and carbon dioxide, obtaining molten urea and a gaseous mixture comprising steam and ammonia. The gaseous mixture is condensed, obtaining a cold aqueous ammoniacal solution. Melamine is synthesized from urea with formation of off-gases, comprising ammonia and carbon dioxide. The off-gases are absorbed in at least one fraction of the cold aqueous ammonical solution, with formation of a carbamate aqueous solution. The carbamate aqueous solution is decomposed, obtaining ammonia, carbon dioxide and steam, and a residual aqueous ammoniacal solution. The ammonia and the carbon dioxide are recycled for the urea synthesis. The residual aqueous ammoniacal solution obtained is treated to recover ammonia and carbon dioxide for the urea synthesis.
REFERENCES:
patent: 3239522 (1966-03-01), Cook et al.
patent: 3723430 (1973-03-01), Kokubo et al.
patent: 6586629 (2003-07-01), Coufal
patent: 1 216 100 (1970-12-01), None
O'Sullivan Peter
Senterfitt Akerman
Urea Casale S.A.
LandOfFree
Integrated process for urea/melamine production and related... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Integrated process for urea/melamine production and related..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Integrated process for urea/melamine production and related... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3531703