Process for the preparation of urea

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

2005-07-26

2005-07-26

O'Sullivan, Peter (Department: 1621)

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

Organic compounds

Amino nitrogen containing

C422S138000, C422S186220, C422S198000, C422S202000, C564S067000, C564S068000, C564S071000, C564S072000

Reexamination Certificate

active

06921838

ABSTRACT:
The invention relates to a process for the preparation of urea from ammonia and carbon dioxide with the application of a synthesis reactor, a condenser, a scrubber and a stripper, wherein an outlet of the stripper, through which a gas stream is discharged during operation, is functionally connected to the inlet of the condenser and to the inlet of the reactor and wherein an outlet of the condenser is functionally connected to an inlet of the scrubber and wherein the obtained reaction mixture is stripped in the stripper in countercurrent with one of the starting materials, wherein the division of the gas stream from the stripper to the condenser and the reactor is completely or partly controlled by one or more controlling elements present in the non-common part of the functional connection between the outlet of the stripper and the inlet of the condenser and/or the inlet of the reactor.

REFERENCES:
patent: 5792889 (1998-08-01), Pagani
patent: 6284922 (2001-09-01), Pagani
patent: 2001/0031893 (2001-10-01), Pagani
patent: 155 735 (1985-09-01), None
patent: 1036787 (2000-09-01), None

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