Patents Assigned to Stamicarbon B.V.
  • Patent number: 10919846
    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.
    Type: Grant
    Filed: December 18, 2019
    Date of Patent: February 16, 2021
    Assignee: Stamicarbon B.V.
    Inventors: Rahul Patil, Fredericus Henricus Maria Buitink
  • Patent number: 10913025
    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.
    Type: Grant
    Filed: December 17, 2015
    Date of Patent: February 9, 2021
    Assignee: Stamicarbon B.V.
    Inventors: Cain Christopher Doherty, Aloysius Mechteldis Emmanuel Schoenmakers
  • Patent number: 10882820
    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.
    Type: Grant
    Filed: August 9, 2019
    Date of Patent: January 5, 2021
    Assignee: Stamicarbon B.V.
    Inventor: Eelco Mostert
  • Patent number: 10865355
    Abstract: Disclosed is method for removing carbonyl sulphide and/or carbon disulphide from a sour gas stream. The method comprises subjecting the gas stream to simultaneous contact with an absorption liquid, such as an aqueous amine solution, and with a catalyst suitable for hydrolyzing carbonyl sulphide and/or carbon disulphide. To this end, the invention also provides a reactor system wherein both an absorption liquid and a catalyst are present. In a preferred embodiment, the catalyst is a heterogeneous catalyst present on or in an absorption column, either coated on the trays of a column with trays, or contained in the packing of a packed column.
    Type: Grant
    Filed: August 15, 2017
    Date of Patent: December 15, 2020
    Assignee: STAMICARBON B.V.
    Inventors: Michele Colozzi, Emma Palo, Palma Contaldo, Maria Rosaria Pepe, Vincenzo Palma, Vincenzo Vaiano
  • Patent number: 10857480
    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.
    Type: Grant
    Filed: October 26, 2018
    Date of Patent: December 8, 2020
    Assignee: Stamicarbon B.V.
    Inventor: Dorin Popa
  • Patent number: 10828593
    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, and subjecting the quenched off-gas to scrubbing using at least one venturi scrubber. As a result, a lower pressure drop over the scrubber is attained, and a more efficient growth of urea particles, facilitating the removal thereof.
    Type: Grant
    Filed: December 28, 2018
    Date of Patent: November 10, 2020
    Assignee: Stamicarbon B.V.
    Inventors: Petrus Catharina Gerlach Soons, Wilfried Marc Renaat Dirkx
  • Patent number: 10829444
    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.
    Type: Grant
    Filed: July 13, 2018
    Date of Patent: November 10, 2020
    Assignee: STAMICARBON B.V.
    Inventors: Juan Coloma González, Johannes Henricus Mennen
  • Publication number: 20200306663
    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.
    Type: Application
    Filed: October 26, 2018
    Publication date: October 1, 2020
    Applicant: Stamicarbon B.V.
    Inventor: Dorin POPPA
  • Publication number: 20200283377
    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.
    Type: Application
    Filed: July 13, 2018
    Publication date: September 10, 2020
    Applicant: STAMICARBON B.V.
    Inventors: Juan COLOMA GONZÁLEZ, Johannes Henricus MENNEN
  • Patent number: 10766856
    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.
    Type: Grant
    Filed: November 27, 2019
    Date of Patent: September 8, 2020
    Assignee: STAMICARBON B.V.
    Inventor: Eelco Mostert
  • Patent number: 10759745
    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.
    Type: Grant
    Filed: November 9, 2018
    Date of Patent: September 1, 2020
    Assignee: Stamicarbon B.V.
    Inventors: Ronny Albert Mathijs Pustjens, Johan Albert Arno Van Den Tillaart
  • Publication number: 20200254419
    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; Si 0-0.8; Mn 0-4.0; Cr more than 29-35; Ni 3.0-10;? Mo 0-4.0; N 0.30-0.55;?? Cu 0-0.8; W 0-3.0; S ?0-0.03; Ce 0-0.2; 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.
    Type: Application
    Filed: April 24, 2020
    Publication date: August 13, 2020
    Applicant: Stamicarbon B.V.
    Inventors: Linn LARSSON, Daniel GULLBERG, Ulf KIVISÄKK, Martin ÖSTLUND, Alexander Aleida Antonius SCHEERDER
  • Patent number: 10730002
    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).
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: August 4, 2020
    Assignee: Stamicarbon B.V.
    Inventors: Brian Sayre Higgins, John Marshall Tate, III, Robert Arthur Yates, Marcel Julien Pomerleau, Jon Michael Heon, Wilfried Marc Renaat Dirkx, Juan Coloma González
  • Patent number: 10722831
    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).
    Type: Grant
    Filed: September 6, 2019
    Date of Patent: July 28, 2020
    Assignee: Stamicarbon B.V.
    Inventors: Brian Sayre Higgins, John Marshall Tate, III, Robert Arthur Yates, Marcel Julien Pomerleau, Jon Michael Heon, Wilfried Marc Renatt Dirkx, Juan Coloma González
  • Patent number: 10710047
    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; Si 0-0.8; Mn 0-4.0; Cr more than 29-35; Ni 3.0-10;? Mo 0-4.0; N 0.30-0.55:? Cu 0-0.8; W 0-3.0; S ?0-0.03; Ce 0-0.2; 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.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: July 14, 2020
    Assignee: Stamicarbon B.V.
    Inventors: Linn Larsson, Daniel Gullberg, Ulf Kivisäkk, Martin Östlund, Alexander Aleida Antonius Scheerder
  • Patent number: 10654719
    Abstract: Disclosed is a process for the concurrent production of hydrogen and sulphur from a H2S-containing gas stream, with zero emissions. The method comprises the thermal oxidative cracking of H2S so as to form H2 and S2. Preferably, the oxidation is conducted using oxygen-enriched air, preferably pure oxygen. The ratio H2S/O2 in the feedstock is higher than 2:1, preferably in the range of 3:1-5:1.
    Type: Grant
    Filed: December 23, 2015
    Date of Patent: May 19, 2020
    Assignee: STAMICARBON B.V. ACTING UNDER THE NAME OF MT INNOVATION CENTER
    Inventors: Lucio Molinari, Fabio Angelini, Lucia Barbato
  • Patent number: 10654758
    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.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: May 19, 2020
    Assignee: Stamicarbon B.V.
    Inventors: Giusy Elisa Puci, Joey Dobree
  • Patent number: 10640428
    Abstract: The invention relates to a method for recovery of urea dust and ammonia from a gas stream by contacting said gas stream with an aqueous sulphuric acid solution, thus forming an acid solution of ammonium sulphate and urea, characterized in that the acid solution is concentrated to a melt comprising less than 5 wt % of water, which melt is subsequently transferred into solid particles comprising urea and ammonium sulphate.
    Type: Grant
    Filed: January 31, 2017
    Date of Patent: May 5, 2020
    Assignee: Stamicarbon B.V.
    Inventors: Jozef Hubert Meessen, Pantelis Orfanidis
  • Publication number: 20200131039
    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.
    Type: Application
    Filed: December 31, 2019
    Publication date: April 30, 2020
    Applicant: Stamicarbon B.V.
    Inventors: Leonardus Hubertus POSTMA, Maria Paz MUÑOZ LÓPEZ, Martinus VOORWINDEN
  • Patent number: 10633331
    Abstract: Disclosed is a process for the preparation of a urea product suitable for being diluted with water so as to form an aqueous urea comprising solution for use in a unit for the reduction of NOx in combustion engine exhaust gases, also known as Diesel Exhaust Fluid (DEF) or to be used in De NOx systems of exhaust vapor from industrial furnaces. The process comprises obtaining an aqueous urea solution from or after a recovery section in a urea production process. This solution, which has a low content of impurities, is subjected to flash crystallization at a low pressure, so as to obtain a solid crystallized urea containing product, which is a free-flowing powder containing less than 0.2 wt. % water. This product is packaged under conditions such that the water content in the packaged product is maintained below 0.2 wt. %. The invention can also be used in a method of increasing the capacity of an existing urea plant.
    Type: Grant
    Filed: July 16, 2015
    Date of Patent: April 28, 2020
    Assignee: Stamicarbon B.V.
    Inventor: Johannes Henricus Mennen