Method for the production of urea and purification

专利名称：Method for the production of urea and

purification of water

发明人：Umberto Zardi,Vincenzo Lagana'申请号：US06/216303申请日：19801215公开号：US04314077A公开日：19820202

摘要：In a urea producing method by synthesis, the improvement which consists infeeding liquid ammonia in excess to the reactor so that a urea solution which containsammonium carbamate is produced, the carbamate is decomposed in a high-pressuredecomposer and the stripping agent is an inert, oxygen-containing gaseous stream, thecarbamate decomposition products are sent to a high pressure condenser and

ammonium carbamate is formed, whereafter the carbamate is separated from the inertsand 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 operatingthe medium-pressure decomposer is a hot condensate from the high-pressure-decomposer-heating steam, and the products of decomposition of the carbamatecoming from the medium- pressure decomposer are sent to a medium-pressurecondenser together with a solution of ammonium carbonate coming from the low-pressure sections of the installation. Virtually pure, nonpolluting waters can bedischarged from the installation.

申请人：SNAMPROGETTI S.P.A.

代理机构：Morgan, Finnegan, Pine, Foley & Lee

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