Process for urea production and plant

Details Process for urea production and plant Process for urea production and plant

2007-05-22

2007-05-22

O'Sullivan, Peter (Department: 1621)

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

Organic compounds

Amino nitrogen containing

C564S066000, C564S067000, C564S068000, C564S069000, C564S070000, C564S071000

Reexamination Certificate

active

11407746

ABSTRACT:
In a process for urea production of the type comprising the reaction between ammonia and carbon dioxide in a high-pressure reactor followed by an autothermal stripping of the resulting reaction mixture so as to obtain a gaseous flow comprising ammonia and carbon dioxide and a liquid flow comprising urea and residual carbamate in aqueous solution and by a stripping of said gaseous flow in units operating at medium pressure, a gaseous flow coming from said units operating at medium pressure and comprising ammonia and carbon dioxide is partially condensed in a condenser to give a mixed liquid/gaseous flow. The uncondensed gases comprising ammonia and carbon dioxide are separated from the liquid phase in a separator and subjected to washing in a packed portion of a column in countercurrent with a flow of a carbonate solution obtaining a gaseous flow essentially consisting of ammonia and a liquid flow comprising a carbamate solution in which the carbon dioxide contained in said uncondensed gases has been absorbed.This process allows an effective recovery of ammonia without carbon dioxide for the recycling to the synthesis reactor.

REFERENCES:
patent: 3527799 (1970-09-01), Mavrovic
patent: 4613696 (1986-09-01), Zardi
patent: 6342632 (2002-01-01), Pagani et al.
patent: 0 157 448 (1985-10-01), None
patent: WO 00/00466 (2000-01-01), None

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