公开(公告)号：US20220089527A1

公开(公告)日：2022-03-24

申请号：US17424948

申请日：2020-12-30

Applicant: STAMICARBON B.V.

Inventor： Rahul PATIL ,  Branislav MANIC ,  Petrus Anna Maria Robertus SIMONS

IPC: C07C273/14 ,  B01D53/58 ,  B01D53/00

Abstract: 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：US20240262789A1

公开(公告)日：2024-08-08

申请号：US18692124

申请日：2023-11-22

Applicant: Stamicarbon B.V.

Inventor： Branislav MANIC ,  Rahul PATIL

IPC: C07C273/12 ,  B01D1/00 ,  C07C273/16 ,  C07D251/60

CPC classification number: C07C273/12 ,  B01D1/0088 ,  C07C273/16 ,  C07D251/60

Abstract: Embodiments pertain to a urea plant and to the operation of a urea plant in a reduced load mode. In embodiments, two evaporators in parallel are used, connected to a finishing section respectively to a melamine plant.

公开(公告)号：US20220281809A1

公开(公告)日：2022-09-08

申请号：US17751861

申请日：2022-05-24

Applicant: STAMICARBON B.V.

Inventor： Rahul PATIL ,  Branislav MANIC ,  Petrus Anna Maria Robertus SIMONS

IPC: C07C273/14 ,  B01D53/00 ,  B01D53/58

Abstract: 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：US20220089529A1

公开(公告)日：2022-03-24

申请号：US17424958

申请日：2020-12-30

Applicant: STAMICARBON B.V.

Inventor： Rahul PATIL ,  Petrus Anna Maria Robertus SIMONS ,  Branislav MANIC

IPC: C07C273/16 ,  B01D5/00 ,  B01D53/54 ,  B01D53/78 ,  C02F1/02 ,  C02F1/20

Abstract: The disclosure pertains to a urea production process using a first and a downstream second evaporator in an evaporation section, a finishing section and a scrubber for treating off-gas of the finishing section. Condensate from the condenser of the second evaporator is supplied to the scrubber.