公开(公告)号：US20200002239A1

公开(公告)日：2020-01-02

申请号：US16569479

申请日：2019-09-12

Applicant: Stamicarbon B.V.

Inventor： Giusy Elisa PUCI ,  Joey DOBREE

IPC: C05C1/00 ,  C05C9/00 ,  B01D53/58 ,  B01D53/14 ,  B01D53/78 ,  B01J12/00 ,  B01J14/00 ,  B01J19/24 ,  C01C1/18 ,  C07C273/04

Abstract: The invention relates to a process for the production of urea ammonium nitrate, a system and a method of modifying a plant. The process comprises treating ammonia-containing off-gas resulting from the production of ammonium nitrate (AN off-gas) with acidic scrubbing liquid in a finishing treatment section having a gas inlet in fluid communication with a gas outlet of a finishing section of a urea production unit, wherein the finishing section is adapted to solidify urea liquid, and wherein said finishing treatment section is adapted to subject ammonia-containing off-gas of the finishing section to treatment with an acidic scrubbing liquid.

公开(公告)号：US10457633B2

公开(公告)日：2019-10-29

申请号：US15735153

申请日：2017-04-28

Applicant: STAMICARBON B.V.

Inventor： Eelco Mostert

IPC: C07C273/04 ,  C07C273/16

Abstract: Disclosed is a novel method of controlling the formation of biuret in urea production. This is accomplished by reducing or preventing the formation of biuret in a concentration section, particularly in one or more concentrators or evaporators. The method comprises controlling the residence time of a urea aqueous stream treated in such concentration section in a manner independently of the volume flow per time interval of said stream into said concentration section. The residence time can be controlled, e.g., by providing the concentration section with an adjustable volume or by adding a gas to the urea stream to be treated. A combination of such measures can also be applied.

公开(公告)号：US10364215B2

公开(公告)日：2019-07-30

申请号：US15685308

申请日：2017-08-24

Applicant: Stamicarbon B.V.

Inventor： Johannes Henricus Mennen ,  Barbara Cucchiella

IPC: B01J19/24 ,  C07C273/04

Abstract: Disclosed is a method for the production of urea allowing a substantial reduction, even down to zero, of the continuous emission of ammonia conventionally resulting from such a process. According to a preferred embodiment of the invention, the urea-forming reaction from carbon dioxide and ammonia is conducted in a synthesis section that does not require passivation by oxygen. As a result of the absence of oxygen, a hydrogen-rich gas stream results from the synthesis section, that can be used as a fuel in an incinerator. In the incinerator, ammonia-comprising gas streams from the urea production process are combusted.

公开(公告)号：US20190194127A1

公开(公告)日：2019-06-27

申请号：US16098837

申请日：2017-04-28

Applicant: STAMICARBON B.V.

Inventor： Eelco MOSTERT

IPC: C07C273/04 ,  C07C273/16 ,  B01D53/58 ,  B01J4/00

Abstract: Disclosed is a novel method of controlling the formation of biuret in urea production, and particularly reducing, preventing or reversing such formation. This is accomplished by adding liquid ammonia to a urea aqueous stream. This addition is done at one or more positions downstream of a recovery section in a urea plant. The addition of liquid ammonia serves to shift the equilibrium of biuret formation from urea, to the side of the formation of urea from biuret and ammonia. The invention can be accomplished also in pre-existing urea plant, by the simple measure of providing an appropriate inlet for liquid ammonia, in fluid communication with a source of such liquid ammonia.

公开(公告)号：US10227265B2

公开(公告)日：2019-03-12

申请号：US15742488

申请日：2016-07-06

Applicant: STAMICARBON B.V.

Inventor： Petrus Catharina Gerlach Soons ,  Stefan H. Schaafsma

IPC: C05C9/00 ,  C05C3/00 ,  C05G3/00 ,  B01J2/16

Abstract: Disclosed is a method of making a granulate of a urea product comprising urea and a salt, such as urea ammonium sulfate, having a high content of the salt. The high content is such as to provide an amount of the salt above the limit of solubility of the salt in urea. The granulate of the invention is characterized by having a smooth surface, which, e.g. in the event of urea ammonium sulfate, is not normally the case for granulate having the aforementioned high ammonium sulfate content. According to the invention this is realized by dividing the feed liquids to granulation. This division is based on non-final granulation liquids of a sufficiently high content of the salt, and a final granulation liquid (determining the surface) having a salt content of below the solubility limit of the salt, or no salt at all. E.g. in the event of urea ammonium sulfate, the non-final granulation liquids possibly are a slurry of urea and more than 20 wt. % of ammonium sulfate. The final granulation liquid then has 0-20 wt. % of ammonium sulfate, i.e. below the solubility limit.

公开(公告)号：US20180304224A1

公开(公告)日：2018-10-25

申请号：US16024686

申请日：2018-06-29

Applicant: Stamicarbon B.V.

Inventor： Linn LARSSON ,  Daniel GULLBERG ,  Ulf KIVISÄKK ,  Martin ÖSTLUND ,  Alexander Aleida Antonius SCHEERDER

IPC: B01J19/02 ,  C22C38/04 ,  C22C38/00 ,  C07C273/04 ,  B22F3/15 ,  C22C38/58 ,  C22C38/44 ,  C22C38/42 ,  F28F21/08 ,  C22C38/40 ,  C22C33/02 ,  C22C38/02

Abstract: Disclosed is a Hot Isostatic Pressed ferritic-austenitic steel alloy, as well objects thereof. The elementary composition of the alloy comprises, in percentages by weight: C 0-0.05; Si0-0.8; Mn0-4.0; Crmore than 29-35; Ni3.0-10;  Mo0-4.0; N0.30-0.55:  Cu0-0.8; W0-3.0; S 0-0.03; Ce0-0.2; the balance being Fe and unavoidable impurities. The objects can be particularly useful in making components for a urea production plant that require processing such as machining or drilling. A preferred use is in making, or replacing, liquid distributors as used in a stripper as is typically present in the high-pressure synthesis section of a urea plant.

公开(公告)号：US20180195158A1

公开(公告)日：2018-07-12

申请号：US15746384

申请日：2016-07-20

Applicant: STAMICARBON B.V.

Inventor： Daniel GULLBERG ,  Christina HARALDSSON ,  Anders WILSON ,  Alexander Aleida Antonius SCHEERDER ,  Kirk Anguah OFEI

IPC: C22C38/58 ,  C22C38/44 ,  C22C38/42 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  F28F21/08

CPC classification number: C22C38/58 ,  B01D1/06 ,  B01D3/32 ,  B01J19/02 ,  B01J2219/0286 ,  C07C273/04 ,  C21D6/004 ,  C21D8/005 ,  C21D9/08 ,  C21D2211/001 ,  C21D2211/005 ,  C22C1/02 ,  C22C33/04 ,  C22C38/001 ,  C22C38/004 ,  C22C38/02 ,  C22C38/04 ,  C22C38/42 ,  C22C38/44 ,  F28F21/083 ,  Y02P10/122

Abstract: The present disclosure relates to a corrosion resistant duplex stainless steel (ferritic austenitic alloy) which is suitable for use in a plant for the production of urea; and uses thereof. The disclosure also relates to objects made of said duplex stainless steel. Furthermore, the present disclosure also relates to a method for the production of urea and to a plant for the production of urea comprising one or more parts made from said duplex stainless steel, and to a method of modifying an existing plant for the production of urea.

公开(公告)号：US09981924B2

公开(公告)日：2018-05-29

申请号：US15692715

申请日：2017-08-31

Applicant: Stamicarbon B.V.

Inventor： Johannes Henricus Mennen

IPC: C07D251/60 ,  C07D251/62 ,  C07C273/12 ,  B01J19/24

CPC classification number: C07D251/60 ,  B01J19/245 ,  B01J2219/00103 ,  B01J2219/24 ,  C07C273/12 ,  C07D251/62

Abstract: Disclosed is a process for the integrated production of urea and melamine. A urea production zone produces a urea synthesis stream comprising urea, water and ammonium carbamate. This stream is subjected to processing, preferably involving stripping, so as to separate an aqueous urea stream from residual dissociated carbamate vapor comprising ammonia, carbon dioxide, and water. The urea is fed to a melamine synthesis zone and subjected to melamine forming conditions so as to form melamine and off-gas comprising carbon dioxide and ammonia. The dissociated carbamate vapor and the melamine off-gas are subjected to combined condensation so as to form a dilute melamine off-gas condensate.

公开(公告)号：US20180044264A1

公开(公告)日：2018-02-15

申请号：US15555924

申请日：2016-03-04

Applicant: STAMICARBON B.V. ACTING UNDER THE NAME OF MT INNOVATION CENTER

Inventor： Chiarra CROPPI ,  Francesco Simone MARTORELLI ,  Emma PALO ,  Gaetano IAQUANIELLO ,  Annarita SALLADINI

IPC: C07C5/333 ,  B01D69/02 ,  B01D71/02 ,  B01J19/24 ,  B01D53/22

CPC classification number: C07C5/333 ,  B01D53/226 ,  B01D53/228 ,  B01D53/229 ,  B01D69/02 ,  B01D71/022 ,  B01D2053/221 ,  B01D2256/24 ,  B01D2256/245 ,  B01D2257/108 ,  B01D2325/04 ,  B01J8/009 ,  B01J8/0419 ,  B01J8/0492 ,  B01J19/245 ,  B01J2208/00212 ,  B01J2208/00274 ,  B01J2219/00024 ,  B01J2219/24 ,  C07C5/3335 ,  C07C5/3337 ,  C07C7/144 ,  C07C2521/04 ,  C07C2523/26 ,  C07C2523/42 ,  C07C11/06 ,  C07C11/04 ,  C07C11/08 ,  C07C15/46

Abstract: Disclosed is a method and plant for the catalytic dehydrogenation of alkanes, such as propane. The plant is a plant of hybrid architecture wherein one or more membrane-assisted reactor configurations according to open architecture are combined with one or more membrane-containing reactors of closed architecture. Hydrogen remaining in the reaction mixture after separation in the membrane separation unit of a first open architecture configuration, is fed to a first membrane-reactor of the closed architecture type. Also disclosed are methods of modifying plants so as to create the hybrid architecture plant.

公开(公告)号：US09890115B2

公开(公告)日：2018-02-13

申请号：US14127962

申请日：2012-10-12

Applicant: Stamicarbon B.V.

Inventor： Johannes Henricus Mennen

IPC: C07C273/16 ,  C07C273/14 ,  B01J2/22 ,  B01J2/30 ,  B29C43/00 ,  C05C9/02 ,  C05C9/00 ,  B29K75/00

CPC classification number: C07C273/16 ,  B01J2/22 ,  B01J2/30 ,  B29C43/006 ,  B29K2075/02 ,  C05C9/005 ,  C05C9/02 ,  C07C273/14 ,  Y10T29/49716

Abstract: Disclosed is a method for urea finishing. A urea solution is subjected to crystallization and, other than in conventional processes, the urea crystals are shaped by exerting mechanical force onto them. Thus, the conventional prilling or granulation finishing steps can be avoided, and so are the corresponding emissions of ammonia and/or dust. The crystallization comprises a flash crystallization. The invention also pertains to the urea particles obtainable by the process, to a urea plant, and to a method of modifying an existing urea plant.