Integrated process for urea and melamine production

Details Integrated process for urea and melamine production Integrated process for urea and melamine production

2007-07-13

2008-08-19

O'Sullivan, Peter G (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

Reexamination Certificate

active

07414130

ABSTRACT:
In an integrated process for urea and melamine production, urea is produced in a urea plant (12) comprising a high pressure urea synthesis section (15) and a urea recovery section (16) for separating urea from a carbamate aqueous solution, and melamine is produced in a melamine plant (11) wherein off-gases resulting as byproducts of the melamine synthesis are discharged therefrom at a pressure of at least 2 bar and recycled to the high pressure urea synthesis section (15).

REFERENCES:
patent: 6114579 (2000-09-01), Van Wijck
patent: 6586629 (2003-07-01), Coufal
patent: 7094927 (2006-08-01), Tjioe et al.
patent: 1 468 207 (1968-11-01), None
patent: 20 53 358 (1972-05-01), None
patent: 1 148 767 (1969-04-01), None

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