Process for urea production

Details Process for urea production Process for urea production

1985-05-02

1986-09-23

Warren, Charles F.

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

Organic compounds

Amino nitrogen containing

564 72, 564 73, C07C12602, C07C12608

Patent

active

046136967

ABSTRACT:
A process for the production of urea from ammonia and carbon dioxide via synthesis where the urea formation takes place in a synthesis zone (or zones) in which an excess of free ammonia is kept to favor high conversions, said synthesis zone (or zones) being followed by an ammonia separation and direct recycle to the reaction step, where the urea solution from said reaction zone (or zones) is intimately contacted for a short duration time with a minor portion of the fresh CO.sub.2. The separation step is followed by a CO.sub.2 stripping step where the residual carbamate is removed using a countercurrent fresh CO.sub.2 stream.

REFERENCES:
patent: 4235816 (1980-12-01), Lagana et al.
patent: 4301299 (1981-12-01), Inoue et al.
patent: 4311856 (1982-01-01), Inoue et al.

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