公开(公告)号：US12139448B2

公开(公告)日：2024-11-12

申请号：US18293947

申请日：2023-10-13

Applicant: Stamicarbon B.V.

Inventor： Solomon Assefa Wassie ,  Rahul Patil

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

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：US10919846B2

公开(公告)日：2021-02-16

申请号：US16961319

申请日：2019-12-18

Applicant: Stamicarbon B.V.

Inventor： Rahul Patil ,  Fredericus Henricus Maria Buitink

IPC: C07C273/14 ,  C07C273/04 ,  B01J3/04 ,  B01D5/00 ,  B01D3/06 ,  B01D3/00

Abstract: The invention pertains to a urea production process using a high pressure stripper and a low pressure decomposer connected to a low pressure carbamate condenser which is in heat exchanging contact through a wall with a sub-atmospheric decomposer wherein urea solution obtained from the low pressure decomposer is processed.

公开(公告)号：US20240425449A1

公开(公告)日：2024-12-26

申请号：US18716802

申请日：2023-02-21

Applicant: STAMICARBON B.V.

Inventor： Rahul Patil

IPC: C07C273/04

Abstract: The disclosure pertains to a urea production process wherein carbamate in a medium pressure (MP) urea solution is decomposed in a tube bundle of a high pressure (HP) carbamate condenser and resulting gas is condensed in indirect heat exchange with urea solution to be heated and wherein a high pressure (HP) stripper is preferably operated with relatively low stripping efficiency.

公开(公告)号：US11912649B2

公开(公告)日：2024-02-27

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 ,  C07C273/04 ,  B01D53/00 ,  B01D53/58

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

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：US12186725B2

公开(公告)日：2025-01-07

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

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：US11905234B2

公开(公告)日：2024-02-20

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 ,  C07C273/04 ,  B01D53/00 ,  B01D53/58

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

Abstract: 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：US12240800B2

公开(公告)日：2025-03-04

申请号：US18692124

申请日：2023-11-22

Applicant: Stamicarbon B.V.

Inventor： Branislav Manic ,  Rahul Patil

IPC: B01D1/00 ,  C07C273/12 ,  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：US12134590B2

公开(公告)日：2024-11-05

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 ,  B01J3/00 ,  B01J3/02 ,  C07D251/60 ,  C07D251/62

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：US11332437B2

公开(公告)日：2022-05-17

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 ,  B01D53/78 ,  C02F1/02 ,  C02F1/20 ,  B01D53/54 ,  C02F103/36 ,  B01D1/00

Abstract: 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.

公开(公告)号：US11420937B2

公开(公告)日：2022-08-23

申请号：US17424940

申请日：2020-12-30

Applicant: STAMICARBON B.V.

Inventor： Rahul Patil

IPC: C07C273/16 ,  B01D5/00 ,  C07C273/04 ,  B01D1/00

Abstract: 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 a first vapor, and condensing the first vapor in a first condensation section, wherein the first condensation section is a chilled condensation section, and a urea production system comprising the chilled condensation section.