公开(公告)号：US11298646B2

公开(公告)日：2022-04-12

申请号：US15036714

申请日：2014-11-14

Applicant: Stamicarbon B.V.

Inventor： Brian Sayre Higgins

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

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：US10975022B2

公开(公告)日：2021-04-13

申请号：US16937976

申请日：2020-07-24

Applicant: STAMICARBON B.V.

Inventor： Ronny Albert Mathijs Pustjens ,  Johan Albert Arno Van Den Tillaart

IPC: B01J19/00 ,  C07C273/04 ,  B01D5/00 ,  C07C273/16 ,  C07C273/14

Abstract: Processes and plants for the production of purified urea solution are described. In a described urea production process, urea is produced in a synthesis section without a high pressure stripper and the urea solution is subjected to purification after the recovery section, to give purified urea solution and off-gas. The purification comprises e.g. steam stripping.

公开(公告)号：US10829444B2

公开(公告)日：2020-11-10

申请号：US16472792

申请日：2018-07-13

Applicant: STAMICARBON B.V.

Inventor： Juan Coloma González ,  Johannes Henricus Mennen

IPC: C07C273/16 ,  B01D53/58 ,  B01D53/73 ,  B01J2/04 ,  B01J4/00 ,  B01D47/10

Abstract: The invention pertains to a finishing process for urea-comprising material, a plant for finishing urea-comprising material, a method of modifying an existing plant, and a use. Methods are disclosed for preventing the clogging of the conduit for off-gas between the finishing section and the treatment section.

公开(公告)号：US10722831B2

公开(公告)日：2020-07-28

申请号：US16563696

申请日：2019-09-06

Applicant: Stamicarbon B.V.

Inventor： Brian Sayre Higgins ,  John Marshall Tate, III ,  Robert Arthur Yates ,  Marcel Julien Pomerleau ,  Jon Michael Heon ,  Wilfried Marc Renatt Dirkx ,  Juan Coloma González

IPC: B01D47/05 ,  B01D47/06 ,  B01D47/10 ,  B01D47/12 ,  B01D47/00 ,  B01D53/40 ,  B01D53/58 ,  B01D53/79 ,  B01J2/04 ,  C07C273/16 ,  C05C9/00

Abstract: Disclosed are methods and systems for removing submicron particles from a gas stream, in particular from urea prilling off-gas, wherein a Venturi ejector is used. A method comprises contacting a gas stream containing submicron particles in a Venturi ejector with an injected high velocity scrubbing liquid to provide a pumping action, wherein the scrubbing liquid has an initial velocity of at least 25 m/s and wherein the ratio of scrubbing liquid and gas flow is between 0.0005 and 0.0015 (m3/h)/(m3/h).

公开(公告)号：US10556796B2

公开(公告)日：2020-02-11

申请号：US15768510

申请日：2017-09-19

Applicant: Stamicarbon B.V.

Inventor： Leonardus Hubertus Postma ,  Maria Paz Muñoz López ,  Martinus Voorwinden

IPC: C01B21/40 ,  C01B21/26 ,  B01D53/00 ,  B01D53/86 ,  B01D53/14

Abstract: Disclosed is a dual pressure plant for the production of nitric acid on the basis of the oxidation of ammonia. The plant comprises a reactor configured to produce a burner gas stream; a gas cooling section configured to form a cooled burner gas; a condensation section configured to form an aqueous nitric acid condensate and an uncondensed nitrogen oxides gas stream; an absorption section configured to produce raw nitric acid and a tail gas; and a tail gas treatment system configured to form a purified tail gas. In a tail gas heating section a further heat exchanger configured to receive heat from the burner gas stream, said further heat exchanger being positioned relatively close to the reactor.

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.