Process for the synthesis of urea comprising two separate reacti

Details Process for the synthesis of urea comprising two separate reacti Process for the synthesis of urea comprising two separate reacti

1995-12-22

1998-05-12

Kumar, Shailendra

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

Organic compounds

Amino nitrogen containing

564 66, 564 70, 564 71, 564 72, C07C27304

Patent

active

057507805

ABSTRACT:
A process for the synthesis of urea starting from ammonia and carbon dioxide, comprising a reaction step carried out in at least two distinct operating zones basically at the same pressure, but having a different operating temperature, the difference being preferably between 5.degree. and 60.degree. C., and subsequent separation steps of the non-converted reagents, wherein a gaseous stream is transferred from the first zone, at a higher temperature, to the second zone, at a lower temperature, and a liquid stream, containing urea and/or ammonium carbamate, is transferred from the second zone to the first, so that said gaseous stream is preferably at least 5% by weight with respect to the stream effluent from the first zone to the subsequent separation steps. This process allows a ratio urea/(urea+carbamate), in the stream leaving said reaction step, of more than 70%, to be obtained.

REFERENCES:
patent: 4208347 (1980-06-01), Pagani

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