Process for the preparation of urea

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

1997-08-29

2000-09-05

O'Sullivan, Peter

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

Organic compounds

Amino nitrogen containing

544201, 564 66, 564 69, 564 70, 564 71, 564 72, C07C27304, C07C27312

Patent

active

061145793

ABSTRACT:
In the present process for the preparation of urea, an off-gas stream released during the synthesis of melamine in a high-pressure melamine process which consists predominantly of ammonia and carbon dioxide, is introduced into at least one high-pressure section of a urea stripping plant and is used in the synthesis of urea. The off-gas stream can be used directly without any further treatment.

REFERENCES:
patent: 3239522 (1966-03-01), Cook et al.
patent: 3700672 (1972-10-01), Kokubo et al.
patent: 3708536 (1973-01-01), Hillenbrand
patent: 4433146 (1984-02-01), Beckers et al.
patent: 4565867 (1986-01-01), Thomas et al.
patent: 5514796 (1996-05-01), Best et al.

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