Process for the preparation of urea

Details Process for the preparation of urea Process for the preparation of urea

2005-02-08

2005-02-08

O'Sullivan, Peter G (Department: 1621)

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

Organic compounds

Amino nitrogen containing

C564S070000, C564S071000, C564S072000, C422S187000, C422S186220, C422S198000, C422S200000

Reexamination Certificate

active

06852886

ABSTRACT:
Process for the preparation of urea from ammonia and carbon dioxide in which a urea synthesis solution containing urea, ammonium carbamate and unconverted ammonia is formed in a synthesis zone, a part of the urea synthesis solution being transferred from the synthesis zone to a medium-pressure treatment zone operating at a pressure of 1-4 MPa, and a gas stream from the medium-pressure treatment zone being absorbed into the low-pressure ammonium carbamate solution from the urea recovery section.

REFERENCES:
patent: 6118023 (2000-09-01), Jonckers et al.
patent: 8 900 152 (1990-08-01), None

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