中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

74 records (took 0.019 seconds)

    22.
    发明专利
    未知

    公开(公告)号：OA08383A

    公开(公告)日：1988-02-29

    申请号：OA58927

    申请日：1986-08-12

    Applicant: STAMICARBON

    Inventor： MEESSEN JOZEF HUBERT ,  SIPKEMA RUDOLF

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

    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.

    23.
    发明专利
    未知

    公开(公告)号：BR8603801A

    公开(公告)日：1987-03-17

    申请号：BR8603801

    申请日：1986-08-08

    Applicant: STAMICARBON

    Inventor： MEESSEN JOZEF HUBERT ,  SPIKEMA RUDOLF

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

    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.

    PREPARATION OF UREA
    24.
    发明专利
    PREPARATION OF UREA 未知

    公开(公告)号：AU6103986A

    公开(公告)日：1987-02-19

    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

    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.

    METHOD AND APPARATUS FOR THE PRODUCTION OF UREA FROM AMMONIA AND CARBON DIOXIDE
    26.
    发明专利
    METHOD AND APPARATUS FOR THE PRODUCTION OF UREA FROM AMMONIA AND CARBON DIOXIDE 未知

    公开(公告)号：MY190234A

    公开(公告)日：2022-04-06

    申请号：MYPI2014703218

    申请日：2013-05-02

    Applicant: STAMICARBON

    Inventor： VAN DEN TILLAART JOHAN ALBERT ARNO ,  MEESSEN JOZEF HUBERT

    IPC: C07C273/04

    Abstract: Method for the production of urea from ammonia and carbon dioxide in a urea plant containing a high-pressure synthesis section with a horizontal pool condenser, wherein the method comprises exchanging heat from a high pressure process medium received in a shell section of the pool condenser to a medium pressure urea containing solution received in a first heat exchanging section provided in the pool condenser to at least decompose ammonium carbamate into NH3 and CO2, wherein the method further comprises exchanging heat from the high pressure process medium to a low pressure steam condensate received in a second heat exchanging section provided in the pool condenser to produce low pressure steam. The invention also relates to an apparatus for the production of urea from ammonia and carbon dioxide. [Fig. 1]

Patent Agency Ranking