C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/548.4
C07C 273/04 (2006.01) C02F 1/02 (2006.01) C02F 9/00 (2006.01) C02F 11/08 (2006.01)
Patent
CA 1106404
CASE 995 METHOD FOR THE PRODUCTION OF UREA AND PURIFICATION OF WATER . - ABSTRACT OF THE DISCLOSURE . - 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 pro- duced, 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, where- after 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.
284053
Lagana Vincenzo
Zardi Umberto
Robic Robic & Associes/associates
Snamprogetti S.p.a.
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