Patents by Inventor Federico Zardi

Federico Zardi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20190262859
    Abstract: A fluid bed granulation process and apparatus, wherein a suitable fluid bed of a particulate material is maintained in a granulator fed by an input flow comprising a growth liquid and by a flow of seeds adapted to promote the granulation, and wherein a part of said input flow is taken upstream the feeding of the fluid bed, and used in a seeds generator, to produce the seeds for the fluid bed.
    Type: Application
    Filed: May 8, 2019
    Publication date: August 29, 2019
    Applicant: Casale SA
    Inventor: Federico Zardi
  • Publication number: 20190137098
    Abstract: A method for the control of nitrogen oxides content in the combustion fumes of a thermal power plant is disclosed; the method comprises the on-site production of ammonia by the steps of: electrolysis of water as a source of hydrogen; separation of air as a source of nitrogen, formation of a make-up gas and synthesis of ammonia in a suitable synthesis loop; said on-site produced ammonia, or a solution thereof, is used for a process of reduction of nitrogen oxides in the combustion fumes.
    Type: Application
    Filed: December 21, 2018
    Publication date: May 9, 2019
    Applicant: Casale SA
    Inventors: Raffaele OSTUNI, Federico ZARDI
  • Patent number: 9988345
    Abstract: The present invention regards a process for the production of an aqueous solution comprising urea for use in the removal of nitrogen oxides from combustion gas or fumes, the process being characterized in that it comprises the steps of: —subjecting at least a part of a urea-concentrated aqueous solution comprising residual free ammonia, obtained directly from or downstream of a recovery section of a plant for the production of urea, to washing with carbon dioxide, so obtaining a first vapor phase comprising carbon dioxide and optionally ammonia and a urea-concentrated aqueous solution comprising carbamate and essentially lacking in free ammonia, and —diluting said urea-concentrated aqueous solution comprising carbamate and essentially lacking in free ammonia with water until the desired concentration of urea in aqueous solution is reached.
    Type: Grant
    Filed: January 30, 2008
    Date of Patent: June 5, 2018
    Assignee: Casale SA
    Inventor: Federico Zardi
  • Publication number: 20170284667
    Abstract: A method for the control of nitrogen oxides content in the combustion fumes of a thermal power plant is disclosed; the method comprises the on-site production of ammonia by the steps of: electrolysis of water as a source of hydrogen; separation of air as a source of nitrogen, formation of a make-up gas and synthesis of ammonia in a suitable synthesis loop; said on-site produced ammonia, or a solution thereof, is used for a process of reduction of nitrogen oxides in the combustion fumes.
    Type: Application
    Filed: June 23, 2017
    Publication date: October 5, 2017
    Applicant: Casale SA
    Inventors: Raffaele OSTUNI, Federico ZARDI
  • Patent number: 9765041
    Abstract: In an integrated process for urea and melamine production, urea is produced in a urea plant (10) comprising a high pressure urea synthesis section (11) from which an aqueous solution comprising urea, ammonium carbamate and ammonia is obtained and a urea recovery section (21) operating at low pressure, and melamine is produced in a melamine plant (40) wherein off-gases resulting as by-products of the melamine synthesis are discharged from said plant at a medium pressure and recycled to the high-pressure urea synthesis section (11).
    Type: Grant
    Filed: March 15, 2016
    Date of Patent: September 19, 2017
    Assignee: Casale SA
    Inventors: Federico Zardi, Paolo Sticchi, Paolo Brunengo
  • Patent number: 9708250
    Abstract: A process for ammonia-urea production where: liquid ammonia produced in an ammonia section is fed to a urea section directly at the ammonia synthesis pressure, and where the liquid ammonia is purified at high pressure with the steps of: cooling the liquid ammonia (20) obtaining a cooled liquid ammonia stream (21), separating a gaseous fraction (22) comprising hydrogen and nitrogen from said cooled liquid ammonia, obtaining purified liquid ammonia (23) at a high pressure, and reheating said purified liquid ammonia (23) after separation of said gaseous fraction, obtaining a reheated purified ammonia (24) having a temperature suitable for feeding to the urea synthesis process. The application also deals with an ammonia-urea plant comprising an ammonia cooler, a liquid-gas separator and an ammonia re-heater and with a method for revamping existing ammonia-urea plants.
    Type: Grant
    Filed: February 10, 2012
    Date of Patent: July 18, 2017
    Assignee: Casale SA
    Inventors: Ermanno Filippi, Marco Badano, Federico Zardi, Andrea Scotto
  • Patent number: 9463983
    Abstract: A method for regulation of an ammonia plant where a purge gas (10) containing inerts is extracted from ammonia synthesis loop (SL), and where the ammonia plant is operated at a partial load by keeping the ammonia synthesis loop at a nominal high pressure, and reducing the purge rate in order to increase concentration of inerts in the ammonia synthesis loop and avoid overheating of the ammonia reactor; preferably a water electrolysis section (WE) produces a hydrogen feed (3) and an air separator produces a nitrogen feed (4); hydrogen and nitrogen are mixed to form a make up gas (5) which is reacted at a high-pressure in said ammonia synthesis loop (SL).
    Type: Grant
    Filed: September 25, 2012
    Date of Patent: October 11, 2016
    Assignee: Casale SA
    Inventors: Raffaele Ostuni, Federico Zardi
  • Publication number: 20160228862
    Abstract: A process and a plant for the preparation of an acqueous solution of urea suitable for use in a SCR process for nitrogen oxides removal, wherein the urea solution from the recovery section of a urea plant is subject to at least one step of evaporation, separating a vapour stream containing water and ammonia, and obtaining a concentrated and substantially ammonia-free solution, and said concentrated solution is diluted to the concentration of urea suitable for use in the SCR process.
    Type: Application
    Filed: April 14, 2016
    Publication date: August 11, 2016
    Applicant: Casale SA
    Inventor: Federico Zardi
  • Publication number: 20160194293
    Abstract: In an integrated process for urea and melamine production, urea is produced in a urea plant (10) comprising a high pressure urea synthesis section (11) from which an aqueous solution comprising urea, ammonium carbamate and ammonia is obtained and a urea recovery section (21) operating at low pressure, and melamine is produced in a melamine plant (40) wherein off-gases resulting as by-products of the melamine synthesis are discharged from said plant at a medium pressure and recycled to the high-pressure urea synthesis section (11).
    Type: Application
    Filed: March 15, 2016
    Publication date: July 7, 2016
    Applicant: Casale SA
    Inventors: Federico ZARDI, Paolo STICCHI, Paolo BRUNENGO
  • Publication number: 20160082408
    Abstract: In an ammonia stripping or self-stripping plant for the synthesis of urea, it is disclosed that a shell-and-tube stripper has a bundle of tubes made of a duplex stainless steel 29Cr-6.5Ni-2Mo—N according to UNS S32906 or 27Cr-7.6Ni-1 Mo-2.3W—N according to UNS S32808. A revamping of urea plants is also disclosed, including the revamping of ammonia stripping plants, self-stripping plants and conventional total recycle plants, wherein said duplex stainless steel is used for the tubes of the stripper.
    Type: Application
    Filed: May 5, 2014
    Publication date: March 24, 2016
    Applicant: Casale SA
    Inventors: Andrea SCOTTO, Federico ZARDI
  • Publication number: 20160023163
    Abstract: A method for the control of nitrogen oxides content in the combustion fumes of a thermal power plant is disclosed; the method comprises the on-site production of ammonia by the steps of: electrolysis of water as a source of hydrogen; separation of air as a source of nitrogen, formation of a make-up gas and synthesis of ammonia in a suitable synthesis loop; said on-site produced ammonia, or a solution thereof, is used for a process of reduction of nitrogen oxides in the combustion fumes.
    Type: Application
    Filed: October 8, 2015
    Publication date: January 28, 2016
    Applicant: Casale SA
    Inventors: Raffaele OSTUNI, Federico ZARDI
  • Publication number: 20150175533
    Abstract: An ammonia-urea plant where purge gas stream (3) generated in the urea section is used as ammonia source for selective catalytic reduction of nitrogen oxides in combustion fumes (4) which are emitted by the ammonia section; a related process and a method for modification of an ammonia-urea plant are also disclosed.
    Type: Application
    Filed: July 3, 2013
    Publication date: June 25, 2015
    Applicant: Casale SA
    Inventor: Federico Zardi
  • Publication number: 20150139880
    Abstract: A method for the control of nitrogen oxides content in the combustion fumes of a thermal power plant is disclosed; the method comprises the on-site production of ammonia by the steps of: electrolysis of water as a source of hydrogen; separation of air as a source of nitrogen, formation of a make-up gas and synthesis of ammonia in a suitable synthesis loop; said on-site produced ammonia, or a solution thereof, is used for a process of reduction of nitrogen oxides in the combustion fumes.
    Type: Application
    Filed: January 20, 2015
    Publication date: May 21, 2015
    Applicant: Casale SA
    Inventors: Raffaele Ostuni, Federico Zardi
  • Publication number: 20140248426
    Abstract: A fluid bed granulation process and apparatus, wherein a suitable fluid bed of a particulate material is maintained in a granulator (1) fed by an input flow (F) comprising a growth liquid (L) and by a flow (S1) of seeds adapted to promote the granulation, and wherein a part (F2) of said input flow (F) is taken upstream the feeding of the fluid bed, and used in a seeds generator (33), to produce the seeds for the fluid bed.
    Type: Application
    Filed: May 13, 2014
    Publication date: September 4, 2014
    Applicant: Urea Casale S.A.
    Inventor: Federico Zardi
  • Patent number: 8721975
    Abstract: Plant for urea production from ammonia and carbon dioxide having a so-called high-pressure section which comprises a synthesis reactor and a condensation unit (7, 107) positioned inside the reactor, all substantially operating at the same pressure.
    Type: Grant
    Filed: February 6, 2009
    Date of Patent: May 13, 2014
    Assignee: Urea Casale SA
    Inventors: Ermanno Filippi, Enrico Rizzi, Mirco Tarozzo, Federico Zardi
  • Publication number: 20140020365
    Abstract: A method for the control of nitrogen oxides content in the combustion fumes of a thermal power plant is disclosed; the method comprises the on-site production of ammonia by the steps of: electrolysis of water as a source of hydrogen; separation of air as a source of nitrogen, formation of a make-up gas and synthesis of ammonia in a suitable synthesis loop; said on-site produced ammonia, or a solution thereof, is used for a process of reduction of nitrogen oxides in the combustion fumes.
    Type: Application
    Filed: September 23, 2013
    Publication date: January 23, 2014
    Applicant: Ammonia Casale SA
    Inventors: Raffaele Ostuni, Federico Zardi
  • Patent number: 8367867
    Abstract: A process for producing urea is disclosed, wherein liquid ammonia and carbon dioxide are reacted in a high-pressure synthesis section (100), and at least part of the carbon dioxide is fed to said synthesis section (100) in liquid phase. A plant operating according to said process and a method for modernizing existing plants accordingly are also disclosed.
    Type: Grant
    Filed: October 4, 2007
    Date of Patent: February 5, 2013
    Assignee: Urea Casale S.A.
    Inventors: Federico Zardi, Sergio Debernardi
  • Patent number: 8263805
    Abstract: A process for producing urea is disclosed, wherein liquid ammonia and carbon dioxide are reacted in a high-pressure synthesis section (100), and at least part of the carbon dioxide is fed to said synthesis section (100) in liquid phase. A plant operating according to said process and a method for modernizing existing plants accordingly are also disclosed.
    Type: Grant
    Filed: October 4, 2007
    Date of Patent: September 11, 2012
    Assignee: Urea Casale S.A.
    Inventors: Federico Zardi, Sergio Debernardi
  • Patent number: 8158823
    Abstract: A method for revamping a conventional self-stripping urea plant is disclosed, where a minor portion (18a) of the carbon dioxide feed is fed to the stripper (7) and used as a stripping agent. In further embodiments, another carbamate condenser is installed, or the conventional horizontal shell-and-tube carbamate condenser (6) is replaced with a vertical submerged unit.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: April 17, 2012
    Assignee: Urea Casale S.A.
    Inventors: Federico Zardi, Andrea Scotto
  • Patent number: 8129565
    Abstract: A process and a related plant layout for producing urea are disclosed, wherein the high-pressure loop (1) comprises a synthesis reactor (2), a thermal stripper (3), a condenser (4), and an adiabatic CO2 stripper (10) disposed upstream said thermal stripper, separating a vapour phase (13) containing ammonia from the urea solution (9) discharged from the reactor, and recycling said vapour phase to the reactor. The adiabatic stripper (10) can be incorporated in a reactor (200) having a top reaction zone and a bottom adiabatic stripping zone. A revamping method for a conventional urea plant in accordance with the inventive process is also disclosed.
    Type: Grant
    Filed: November 17, 2009
    Date of Patent: March 6, 2012
    Assignee: Urea Casale S.A.
    Inventors: Federico Zardi, Andrea Scotto