Process for the preparation of urea

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

2005-04-19

2005-04-19

O'Sullivan, Peter (Department: 1621)

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

Organic compounds

Amino nitrogen containing

C422S186220, C564S067000, C564S070000, C564S073000

Reexamination Certificate

active

06881862

ABSTRACT:
The invention relates to a process for the preparation of urea from ammonia and carbon dioxide, which preparation takes places wholy or partly 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 gas stream coming from the top of the submerged condenser is subjected to an extra washing step before this gas stream is supplied to the high-pressure scrubber. The submerged condenser operating as such may be for example a submerged condenser of horizontal or vertical design of a falling-film high-pressure carbamate condenser transformed into a submerged condenser. The invention further relates to a process for improving and/or optimizing a urea plant as well as to a urea plant as such.

REFERENCES:
patent: 6284922 (2001-09-01), Pagani
patent: 20010031893 (2001-10-01), Pagani
patent: 1036787 (2003-06-01), None

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