Organic compounds -- part of the class 532-570 series – Organic compounds – Amino nitrogen containing
Patent
1992-09-16
1995-01-10
Raymond, Richard L.
Organic compounds -- part of the class 532-570 series
Organic compounds
Amino nitrogen containing
564 63, 564 69, 564 70, 564 71, C07C27304
Patent
active
053809432
ABSTRACT:
Process for the industrial synthesis of urea, by reacting ammonia (NH.sub.3) and carbon dioxide (CO.sub.2) in at least one reaction space, at high pressures and temperatures and by recirculating at least part of the non-reacted products obtained in a recovery section, characterized by the fact that the following takes place : a synthesis reaction A) between highly pure reagents, and a synthesis reaction B) between less pure reagents, substantially recycled from the said recovery section, the reaction A) being either of adiabatic type A1) or with partial reaction heat removal A2).
REFERENCES:
patent: 4504679 (1985-03-01), Inoue et al.
patent: 4670588 (1987-06-01), Zardi
patent: 4801745 (1989-01-01), Meessen et al.
patent: 5276183 (1994-01-01), Pagani et al.
Pagani Giorgio
Zardi Umberto
Kumar Shailendra
Raymond Richard L.
Urea Casale S.A.
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