公开(公告)号：US12179138B2

公开(公告)日：2024-12-31

申请号：US17141328

申请日：2021-01-05

Applicant: STAMICARBON B.V.

Inventor： Cain Christopher Doherty ,  Aloysius Mechteldis Emmanuel Schoenmakers

IPC: B01D47/10 ,  B01D47/05 ,  B01D47/06 ,  C05C9/00 ,  C07C273/02 ,  C07C273/04

Abstract: Disclosed is a method for the removal of urea dust from the off-gas of a finishing section of a urea production plant. the method comprises subjecting the off-gas to quenching with water so as to produce quenched off-gas. The quenched off-gas is subjected to humidification by mixing said quenched gas stream with a humidification fluid selected from (a) saturated steam and (b) superheated steam mixed with a second aqueous stream, so as to produce a humidified gas stream, subjecting said humidified gas stream to particle separation (i.e., dust removal) by means of a scrubbing liquid in which at least part of the particles in the gas stream are soluble.

公开(公告)号：US12083468B2

公开(公告)日：2024-09-10

申请号：US17684716

申请日：2022-03-02

Applicant: Stamicarbon B.V.

Inventor： Brian Sayre Higgins

IPC: B01D47/12 ,  B01D47/05 ,  B01D47/06 ,  B01D47/10 ,  B03C3/013 ,  C07C273/16 ,  B01D53/58

CPC classification number: B01D47/12 ,  B01D47/05 ,  B01D47/06 ,  B01D47/10 ,  B03C3/013 ,  C07C273/16 ,  B01D53/58 ,  B01D2247/04 ,  B01D2247/102 ,  B01D2247/103 ,  B01D2247/107 ,  B01D2251/506 ,  B01D2252/103

Abstract: Disclosed is a method for the removal of soluble particulate matter from a gas stream, such as urea dust from the off-gas of a finishing section of a urea production plant. The method comprises subjecting the off-gas to at least two quenching stages an aqueous quenching liquid. The quenching liquid used in a first, upstream quench stage, is allowed to have a higher concentration of dissolved particulate matter than the quenching liquid in the second, downstream quench stage. The quenched gas is led through a particle capture zone, typically comprising one or more of a wet scrubber, a Venturi scrubber, and a wet electrostatic precipitator.

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：US20240082808A1

公开(公告)日：2024-03-14

申请号：US18257475

申请日：2022-04-28

Applicant: STAMICARBON B.V.

Inventor： Ronny Albert Mathijs PUSTJENS ,  Johan Albert Arno VAN DEN TILLAART

IPC: B01J19/24 ,  B01J19/00 ,  C07C273/04

CPC classification number: B01J19/249 ,  B01J19/0066 ,  C07C273/04 ,  B01J2219/2458

Abstract: Embodiments of the disclosure pertain to a chemical reactor comprising a mixing zone comprising first static mixer and a second static mixer both arranged in shell of the reactor, wherein the second static mixer is positioned further from said first inlet than said first static mixer, wherein the second static mixer is adapted for more intimate mixing of fluids in the reaction mixture than the first static mixer.

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：US11814340B2

公开(公告)日：2023-11-14

申请号：US17636257

申请日：2021-06-23

Applicant: STAMICARBON B.V.

Inventor： Wilhelmus Hubertus Geurts

IPC: C07C273/04 ,  B01D5/00 ,  B01J3/02 ,  B01J3/04

CPC classification number: C07C273/04 ,  B01D5/0075 ,  B01J3/02 ,  B01J3/042

Abstract: The disclosure pertains to an urea production plant and process using a thermal stripper, wherein the reaction mixture is separated in two parts, wherein the first part is supplied at least in part to the thermal stripper and the second part at least in part bypasses the thermal stripper and is supplied to a medium pressure recovery section.

公开(公告)号：US11766627B2

公开(公告)日：2023-09-26

申请号：US17724085

申请日：2022-04-19

Applicant: STAMICARBON B.V.

Inventor： Dorin Popa

IPC: B01D5/00 ,  B01J10/00 ,  C07C273/04 ,  C07C273/14 ,  F28D7/06 ,  F28F9/02 ,  F28D21/00

CPC classification number: B01D5/0075 ,  B01D5/0009 ,  B01D5/0081 ,  B01D5/0087 ,  B01D5/0093 ,  B01J10/00 ,  C07C273/04 ,  C07C273/14 ,  F28D7/06 ,  F28F9/0202 ,  F28F9/0246 ,  F28D2021/0022 ,  F28D2021/0063 ,  F28F2009/0287

Abstract: Described are a high pressure carbamate condenser, urea plant, and urea production process. The high pressure carbamate condenser as described is of the shell-and-tube heat exchanger type with a tube bundle and has a redistribution chamber connected to tubes of the tube bundle and to a duct. The duct extends between the redistribution chamber and the shell.

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：US11338221B2

公开(公告)日：2022-05-24

申请号：US17114317

申请日：2020-12-07

Applicant: STAMICARBON B.V.

Inventor： Dorin Popa

IPC: B01D5/00 ,  B01J10/00 ,  F28D9/02 ,  C07C273/04 ,  C07C273/14 ,  F28D7/06 ,  F28F9/02 ,  F28D21/00

Abstract: Disclosed is a shell-and-tube heat exchanger type with a tube bundle and has a redistribution chamber connected to tubes of the tube bundle and to a duct. The duct extends between the redistribution chamber and the shell.