公开(公告)号：US20240262788A1

公开(公告)日：2024-08-08

申请号：US18293947

申请日：2023-10-13

Applicant: Stamicarbon B.V.

Inventor： Solomon Assefa WASSIE ,  Rahul PATIL

IPC: C07C273/12 ,  B01J19/00 ,  C07C273/04 ,  C07D251/60

CPC classification number: C07C273/12 ,  B01J19/0046 ,  C07C273/04 ,  C07D251/60 ,  B01J2219/00452 ,  B01J2219/00477 ,  B01J2219/00495

Abstract: The disclosure pertains to urea production with, in series, an MP carbamate condenser for condensing at least urea synthesis section off-gas, gas/liquid separation giving a gas stream and a liquid stream, and a second carbamate condenser receiving off-gas from melamine production and said liquid stream.

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：US20240327358A1

公开(公告)日：2024-10-03

申请号：US18699960

申请日：2023-11-22

Applicant: Stamicarbon B.V.

Inventor： Rahul PATIL

IPC: C07D251/60 ,  B01D3/06 ,  B01D53/00 ,  B01D53/14 ,  B01D53/18 ,  C07C273/12 ,  C07C273/16

CPC classification number: C07D251/60 ,  B01D3/06 ,  B01D53/002 ,  B01D53/1493 ,  B01D53/18 ,  C07C273/12 ,  C07C273/16 ,  B01D2252/2041 ,  B01D2252/20431

Abstract: The disclosure pertains to a plant and process for the coupled production of urea and melamine. In an embodiment, a lean carbamate solution is supplied from the melamine production section to a recovery section of the urea production section. In an embodiment, enriched carbamate solution from the urea production section is supplied to an off-gas condenser of the melamine production section.

公开(公告)号：US20240261751A1

公开(公告)日：2024-08-08

申请号：US18578192

申请日：2023-05-12

Applicant: Stamicarbon B.V.

Inventor： Rahul PATIL ,  Lambertus Wilhelmus GEVERS ,  Markus Theodorus Marie Michaël WAGEMANS

IPC: B01J19/00 ,  B01J4/00 ,  C07C273/04

CPC classification number: B01J19/0013 ,  B01J4/001 ,  B01J19/006 ,  C07C273/04 ,  B01J2208/00176 ,  B01J2208/00194 ,  B01J2208/00256 ,  B01J2219/00081

Abstract: The disclosure pertains to a high pressure carbamate condensation apparatus for a urea plant, a urea plant, and a urea production method. The apparatus comprises a first U-shaped tube bundle arranged around a second U-shaped tube bundle.

公开(公告)号：US20240270685A1

公开(公告)日：2024-08-15

申请号：US18688914

申请日：2023-11-22

Applicant: Stamicarbon B.V.

Inventor： Rahul PATIL ,  Johannes Henricus MENNEN ,  Lambertus Wilhelmus GEVERS

IPC: C07C273/12 ,  C07D251/60

CPC classification number: C07C273/12 ,  C07D251/60

Abstract: The disclosure pertains to a coupled plant process for the production of urea and melamine, with a urea synthesis section with HP CO2 stripping, and with a part of the CO2 feed supplied to a recovery 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.

公开(公告)号：US20220089528A1

公开(公告)日：2022-03-24

申请号：US17424940

申请日：2020-12-30

Applicant: STAMICARBON B.V.

Inventor： Rahul PATIL

IPC: C07C273/16 ,  B01D5/00 ,  C07C273/04

Abstract: The disclosure pertains to a urea production process comprising concentrating a first urea solution in a first vacuum evaporator in an evaporation section to give a urea melt and first vapor, and condensing said first vapor in a first condensation section, wherein the first condensation section is a chilled condensation section.