中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

119 records (took 0.02 seconds)

    UREA PRODUCTION PROCESS CHARACTERIZED BY SHORT UREA MELT TRANSPORTATION TIME BETWEEN LAST CONCENTRATOR AND PRILLING TOWER
    72.
    发明专利
    UREA PRODUCTION PROCESS CHARACTERIZED BY SHORT UREA MELT TRANSPORTATION TIME BETWEEN LAST CONCENTRATOR AND PRILLING TOWER 未知

    公开(公告)号：CA2845302C

    公开(公告)日：2020-06-30

    申请号：CA2845302

    申请日：2012-08-17

    Applicant: STAMICARBON

    Inventor： MENNEN JOHANNES HENRICUS

    IPC: C07C273/04

    Abstract: The invention relates to a method for urea production and to a urea production plant wherein ammonia emission in the final step of forming urea prills is reduced. In the method, the concentration of a urea solution is performed in at least three consecutive concentration steps and the residence time of urea melt leaving a last concentrator to the prilling tower is minimised. This can be achieved by placing the last concentrator in adjacency with a urea melt inlet of the prilling tower, such as above the prilling tower. In this way, the ammonia emission in the prilling tower can be reduced by as much as 50% compared to the conventional urea production plants. The invention further relates to a method for reducing ammonia emission in the prilling tower of an existing urea production plant.

    INTEGRATED PRODUCTION OF UREA AND MELAMINE
    75.
    发明专利
    INTEGRATED PRODUCTION OF UREA AND MELAMINE 未知

    公开(公告)号：CA2933474C

    公开(公告)日：2018-10-30

    申请号：CA2933474

    申请日：2014-12-16

    Applicant: STAMICARBON

    Inventor： MENNEN JOHANNES HENRICUS

    IPC: C07D251/60 ,  C07C273/12

    Abstract: Disclosed is a process for the integrated production of urea and melamine. A urea production zone produces a urea synthesis stream comprising urea, water and ammonium carbamate. This stream is subjected to processing, preferably involving stripping, so as to separate an aqueous urea stream from residual dissociated carbamate vapor comprising ammonia, carbon dioxide, and water. The urea is fed to a melamine synthesis zone and subjected to melamine forming conditions so as to form melamine and off-gas comprising carbon dioxide and ammonia. The dissociated carbamate vapor and the melamine off- gas are subjected to combined condensation so as to form a dilute melamine off-gas condensate.

    UREA FINISHING METHOD
    78.
    发明专利
    UREA FINISHING METHOD 未知

    公开(公告)号：AP3926A

    公开(公告)日：2016-12-10

    申请号：AP2013007324

    申请日：2012-10-12

    Applicant: STAMICARBON

    Inventor： MENNEN JOHANNES HENRICUS

    IPC: C07C273/16 ,  B01J2/22 ,  C07C273/02

    Abstract: Disclosed is a method for urea finishing. A urea solution is subjected to crystallization and, other than in conventional processes, the urea crystals are shaped by exerting mechanical force onto them. Thus, the conventional prilling or granulation finishing steps can be avoided, and so are the corresponding emissions of ammonia and/or dust. The crystallization comprises a flash crystallization. The invention also pertains to the urea particles obtainable by the process, to a urea plant, and to a method of modifying an existing urea plant.

    UREA FINISHING METHOD
    79.
    发明专利
    UREA FINISHING METHOD 未知

    公开(公告)号：GEP201606569B

    公开(公告)日：2016-11-10

    申请号：GEAP2012013361

    申请日：2012-10-12

    Applicant: STAMICARBON

    Inventor： MENNEN JOHANNES HENRICUS

    IPC: C07C273/16 ,  B01J2/22 ,  C07C273/02

    Abstract: A method for receiving urea particles from urea water solution includes crystallization and formation steps thereof; the solution is exposed to throttling for solid crystallized urea preparation at crystallization step, whereto mechanical efforts are made at formation step.

Patent Agency Ranking