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(11)    Patent No :    AP 2661    (73) Applicant(s)       
(21)    Application No :    AP/P/2009/005062    ENI S.P.A., Piazzale E. Mattei,1, I-00144, Rome,       
            Italy       
                   
(22)    Filing Date :    19.05.2008           
(24)    Date of Grant &    15.05.2013           
                   
(45)    Publication :

(30)    Priority Data            (72) Inventors   
    (33) Country    (31) Number    (32) Date    PATRON Luigi, Italy   
    IT    MI2007A001044    23.05.2007    BELLUSSI Giuseppe, Italy   
                   
                TAGLIABUE Lorenzo, Italy   
                et al   
                (74) Representative   
(84)    Designated State           
               
    UG            FISHER CORMACK & BOTHA   
               
(51)    International    Classification    C10G 49/00 (2006.01)   
(54)    Title

System and process for the hydroconversion of heavy oils

(57)    Abstract

An enhanced process is described for the synthesis of urea from ammonia and

carbon dioxide, at a high pressure and temperature, with the formation of ammonium carbamate as intermediate, which includes a high pressure synthesis section, comprising at least one separation step by decomposition-stripping with ammonia of the non -converted ammonium carbamate, carried out in a vertical apparatus, commonly called stripper, characterized in that said step also comprises a feeding, in the lower part of said stripper, of a stream of C02, heated to a temperature ranging from 130 to 230°C, in a quantity of 1 to 15% by weight with respect to the total weight of the fresh C02 fed to the process, containing a passivating agent in such a quantity that its equivalent content of 02 in moles varies from 0.05% to

(56)    Documents Cited :    US 6 841 064 B1    US 6 436 279 B1    US 2006/054533 A1

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