公开(公告)号：US11912649B2

公开(公告)日：2024-02-27

申请号：US17424948

申请日：2020-12-30

申请人： STAMICARBON B.V.

发明人： Rahul Patil ,  Branislav Manic ,  Petrus Anna Maria Robertus Simons

IPC分类号： C07C273/14 ,  C07C273/04 ,  B01D53/00 ,  B01D53/58

CPC分类号： C07C273/14 ,  B01D53/002 ,  B01D53/58 ,  B01D2251/504 ,  B01D2251/506 ,  B01D2257/406 ,  B01D2257/80 ,  C07C273/04

摘要： Disclosed is a method for the removal of ammonia from the off-gas of a finishing section of a urea production plant. Also disclosed is a corresponding urea plant, and a method of accordingly modifying a pre-existing urea plant. In a scrubbing section, the off-gas is brought into contact with an acidic scrubbing liquid so as to provide a scrubbed off-gas and a utilized scrubbing liquid comprising ammonium salt. The method specifies an evaporation section, which is part of the urea plant that produces urea melt, that is divided into first and second stages. The first stage is part of the urea melt production plant. The second stage decoupled, as regards recirculation of liquids other than the urea product stream, from the urea melt production plant. This is accomplished by sending utilized scrubbing liquid that contains ammonium salts to the second stage evaporation section, and by sending condensed vapours from said second stage evaporation section to said scrubbing section.

公开(公告)号：US11905234B2

公开(公告)日：2024-02-20

申请号：US17751861

申请日：2022-05-24

申请人： STAMICARBON B.V.

发明人： Rahul Patil ,  Branislav Manic ,  Petrus Anna Maria Robertus Simons

IPC分类号： C07C273/14 ,  C07C273/04 ,  B01D53/00 ,  B01D53/58

CPC分类号： C07C273/14 ,  B01D53/002 ,  B01D53/58 ,  B01D2251/504 ,  B01D2251/506 ,  B01D2257/406 ,  B01D2257/80 ,  C07C273/04

摘要： A method for the removal of ammonia from the off-gas of a finishing section of a urea production plant, a corresponding urea plant, and a method of accordingly modifying a pre-existing urea plant. In a scrubbing section, off-gas is brought into contact with acidic scrubbing liquid to provide a scrubbed off-gas and a utilized scrubbing liquid comprising ammonium salt. The method specifies an evaporation section, which is part of the urea plant that produces urea melt, that is divided into first and second stages. The first stage is part of the urea melt production plant. The second stage is decoupled, as regards recirculation of liquids other than the urea product stream, from the urea melt production plant. This is accomplished by sending utilized scrubbing liquid containing ammonium salts to the second stage evaporation section, and condensed vapours from said second stage evaporation section to said scrubbing section.

公开(公告)号：US11332437B2

公开(公告)日：2022-05-17

申请号：US17424958

申请日：2020-12-30

申请人： STAMICARBON B.V.

发明人： Rahul Patil ,  Petrus Anna Maria Robertus Simons ,  Branislav Manic

IPC分类号： C07C273/16 ,  B01D5/00 ,  B01D53/78 ,  C02F1/02 ,  C02F1/20 ,  B01D53/54 ,  C02F103/36 ,  B01D1/00

摘要： A urea production process which includes and a synthesis section, a recovery section and evaporation section and a finishing section wherein the evaporation section includes a first evaporator and downstream thereof a second evaporator for urea solution. The second evaporator operates a lower pressure than the first evaporator to provide a urea melt and second vapor, solidifying the urea melt in a finishing section to provide a solid urea produce and off gas, scrubbing the off gas followed by condensing to produce a first condensate and second condensate; supplying the first condensate to a wastewater treatment section and supply the second condensate to the scrubber wherein the second condensate is used as a scrub liquid in the scrubber.