Process and plant for the production of urea

Details Process and plant for the production of urea Process and plant for the production of urea

2006-08-15

2006-08-15

O'Sullivan, Peter (Department: 1621)

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

Organic compounds

Amino nitrogen containing

C564S070000, C564S071000, C564S072000, C422S186220

Reexamination Certificate

active

07091379

ABSTRACT:
A process for urea production comprises the steps of:—performing a reaction between ammonia and carbon dioxide in a reaction space to obtain a reaction mixture comprising urea, carbamate and free ammonia in aqueous solution,—subjecting said mixture to a stripping treatment with carbon dioxide feed as a stripping agent to obtain a first flow comprising ammonia and carbon dioxide in vapor phase and a flow comprising urea and residual carbamate in aqueous solution,—feeding said flow comprising urea and residual carbamate in aqueoue solution to a urea recovery section,—separating in said recovery section said residual carbamate from the urea to obtain a first flow of carbamate in aqueous solution.

REFERENCES:
patent: 6680407 (2004-01-01), Mennen
patent: 2001/0041813 (2001-11-01), Jonckers et al.

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