公开(公告)号：MY131105A

公开(公告)日：2007-07-31

申请号：MYPI20032781

申请日：2003-07-23

Applicant: STAMICARBON

Inventor： TJIOE TJAY TJIEN ,  MEESSEN JOZEF HUBERT

IPC: C07C273/04 ,  C07C273/12 ,  C07D251/60

Abstract: PROCESS FOR INCREASING THE CAPACITY OF A UREA PLANT COMPRISING A COMPRESSION SECTION,A HIGH-PRESSURE SYNTHESIS SECTION,A UREA RECOVERY SECTION, IN WHICH A UREA MELT IS FORMED, ADN OPTIONALLY A GRANULATION SECTION, THE CAPACITY OF THE UREA PLANT BEING INCREASED BY THE ADDITIONAL INSTALLATION OF A MELAMINE PLANT AND THE UREA MELT FROM THE UREA RECOVERY SECTION OF THE UREA PLANT BEING FED WHOLLY OR PARTLY TO THE MELAMINE PLANT AND THE RESIDUAL GASES FROM THE MELAMINE PLANT BEING RETURNED WHOLLY OR PARTLY TO THE HIGH-PRESSURE SYNTHESIS SECTION AND/OR THE UREA RECOVERY SECTION OF THE UREA PLANT.

公开(公告)号：AU5578898A

公开(公告)日：1998-08-18

申请号：AU5578898

申请日：1998-01-20

Applicant: STAMICARBON

Inventor： WIJCK JULIUS GERARDUS THEODORU ,  MEESSEN JOZEF HUBERT

IPC: C07C273/12

Abstract: Process for the preparation of urea, in which the gas stream which is released during the synthesis of melamine and is composed essentially of ammonia and carbon dioxide is used to synthesize urea, in which process the gas stream which originates from a high-pressure melamine process and is composed essentially of ammonia and carbon dioxide is condensed at a pressure virtually equal to the pressure in the melamine reactor, in which process substantially anhydrous ammonium carbamate is formed, after which said ammonium carbamate is fed to a high-pressure section of a urea stripping plant.

公开(公告)号：AU592360B2

公开(公告)日：1990-01-11

申请号：AU6103986

申请日：1986-08-11

Applicant: STAMICARBON

Inventor： MEESSEN JOZEF HUBERT ,  SIPKEMA RUDOLF

IPC: C07C67/00 ,  C07C239/00 ,  C07C273/04 ,  C07C126/02 ,  C07C126/08

Abstract: Process for the preparation of urea in which- a urea synthesis solution containing carbamate and free ammo­nia is formed in a high-pressure part in a synthesis zone at an NH₃/CO₂ molar ratio of up to 4 : 1, a temperature of at least 175 ◊C and the corresponding pressure,- a portion of the carbamate is decomposed in a first decom­position stage at synthesis pressure or lower pressure by a stripping treatment with carbon dioxide while heating is applied, and the gas mixture thus obtained is at least in part condensed and the condensate and the non-condensed por­tion of the gas mixture, if any, are returned to the synthe­sis zone,- in at least two further decomposition stages a further por­tion of the carbamate still present is decomposed and the gas mixture formed is separated, in the first of the further decomposition stages a pressure of 12-30 bar being maintained and heat being supplied,- and the remaining urea-containing solution is processed further by evaporation to a concentrated urea solution and, if desired, solid urea.The gas mixture, formed on expansion of the stripped urea synthesis solution to a pressure equal to or higher than the pressure in the first one of the further decomposition stages, is brought into direct contact in a contact zone with the solution remaining after further amounts of carbamate still present have herein been decomposed and the gases thus formed have been separated. The remaining gas mixture is thereafter discharged from the contract zone and is condensed. The con­densate is returned to the high-pressure part of the urea synthesis.

公开(公告)号：NO863211D0

公开(公告)日：1986-08-08

申请号：NO863211

申请日：1986-08-08

Applicant: STAMICARBON

Inventor： MEESSEN JOZEF HUBERT ,  SIPKEMA RUDOLF

IPC: C07C67/00 ,  C07C239/00 ,  C07C273/04 ,  C07C126/00

Abstract: Process for the preparation of urea in which- a urea synthesis solution containing carbamate and free ammo­nia is formed in a high-pressure part in a synthesis zone at an NH₃/CO₂ molar ratio of up to 4 : 1, a temperature of at least 175 ◊C and the corresponding pressure,- a portion of the carbamate is decomposed in a first decom­position stage at synthesis pressure or lower pressure by a stripping treatment with carbon dioxide while heating is applied, and the gas mixture thus obtained is at least in part condensed and the condensate and the non-condensed por­tion of the gas mixture, if any, are returned to the synthe­sis zone,- in at least two further decomposition stages a further por­tion of the carbamate still present is decomposed and the gas mixture formed is separated, in the first of the further decomposition stages a pressure of 12-30 bar being maintained and heat being supplied,- and the remaining urea-containing solution is processed further by evaporation to a concentrated urea solution and, if desired, solid urea.The gas mixture, formed on expansion of the stripped urea synthesis solution to a pressure equal to or higher than the pressure in the first one of the further decomposition stages, is brought into direct contact in a contact zone with the solution remaining after further amounts of carbamate still present have herein been decomposed and the gases thus formed have been separated. The remaining gas mixture is thereafter discharged from the contract zone and is condensed. The con­densate is returned to the high-pressure part of the urea synthesis.