Method for the production of urea and purification of water

Details Method for the production of urea and purification of water Method for the production of urea and purification of water

1980-12-15

1982-02-02

Hearn, Brian E.

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

Organic compounds

Amino nitrogen containing

564 72, C07C12602

Patent

active

043140777

ABSTRACT:
In a urea producing method by synthesis, the improvement which consists in feeding liquid ammonia in excess to the reactor so that a urea solution which contains ammonium carbamate is produced, the carbamate is decomposed in a high-pressure decomposer and the stripping agent is an inert, oxygen-containing gaseous stream, the carbamate decomposition products are sent to a high pressure condenser and ammonium carbamate is formed, whereafter the carbamate is separated from the inerts and the solution of urea coming from the high-pressure decomposer is fed to a medium-pressure decomposer which is fed through its bottom with inerts. The heat for operating the medium-pressure decomposer is a hot condensate from the high-pressure-decomposer-heating steam, and the products of decomposition of the carbamate coming from the medium-pressure decomposer are sent to a medium-pressure condenser together with a solution of ammonium carbonate coming from the low-pressure sections of the installation. Virtually pure, nonpolluting waters can be discharged from the installation.

REFERENCES:
patent: 3120563 (1964-02-01), Bongard
patent: 3826815 (1974-07-01), Mavrovic
patent: 3876696 (1975-04-01), Guadalupi
patent: 3922222 (1975-11-01), Van Moorsel
patent: 3944605 (1976-03-01), Inoue
patent: 4012443 (1977-03-01), Bonetti
patent: 4036878 (1977-07-01), Kaasenbrood
patent: 4053507 (1977-10-01), Inoue
patent: 4082797 (1978-04-01), Zardi
patent: 4207256 (1980-06-01), Inoue

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