Process for urea production from ammonia and carbon dioxide

Details Process for urea production from ammonia and carbon dioxide Process for urea production from ammonia and carbon dioxide

2005-07-22

2010-06-08

O'Sullivan, Peter G (Department: 1621)

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

Organic compounds

Amino nitrogen containing

C564S067000, C564S068000, C564S069000, C564S070000, C564S071000, C564S072000, C564S073000

Reexamination Certificate

active

07732640

ABSTRACT:
A process for urea production comprises a first process step in which ammonia (7) and carbon dioxide (6) are obtained, subjecting natural gas (1) to reforming treatments (12, 14), and a second step of urea (8a) production from such ammonia (7) and from carbon dioxide, through a formation of a solution comprising urea and ammonium carbamate in a urea synthesis reactor (20) and a subsequent decomposition of the ammonium carbamate and. urea recovery, the process comprises the steps of:—treating combustion smokes (5) comprising carbon dioxide with an aqueous solution (9a) comprising a part (7b) of such ammonia (7), obtaining an aqueous ammonium carbamate solution (9c);—supplying the solution (9c) thus obtained to the second process step.

REFERENCES:
patent: 1 188 710 (2002-03-01), None
patent: 2 051 757 (1981-01-01), None
patent: WO 02/090250 (2002-11-01), None

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