公开(公告)号：US20240344968A1

公开(公告)日：2024-10-17

申请号：US18701041

申请日：2022-10-11

申请人： Casale SA

发明人： Leonardo Marrone ,  Marco Ormellese ,  Silvia Beretta

IPC分类号： G01N17/02 ,  G01N17/04

CPC分类号： G01N17/02 ,  G01N17/04

摘要： Method for determining the corrosion rate of a piece of equipment of a urea synthesis plant, the method comprises the provision of electrodes including a working electrode immersed in an aqueous solution containing ammonium carbamate, the method further comprises the determination of polarization data of the working electrode and the determination of the corrosion rate of said piece of equipment based on said polarization data.

公开(公告)号：US20240294469A1

公开(公告)日：2024-09-05

申请号：US18647214

申请日：2024-04-26

申请人： Casale SA

发明人： Leonardo Marrone ,  Alberto Benedetti ,  Paolo Bertini

IPC分类号： C07C273/16 ,  B01D3/06 ,  B01D5/00 ,  B01D61/02 ,  C07C273/04

CPC分类号： C07C273/16 ,  B01D3/06 ,  B01D5/0072 ,  B01D5/0084 ,  B01D61/026 ,  C07C273/04 ,  B01D2311/06 ,  B01D2311/08 ,  B01D2313/50 ,  B01D2317/027

摘要： A process for purify ing a urea-containing aqueous stream, such as the aqueous stream from the recovery section of a urea plant. comprising a step of removing biuret from the urea-containing stream by reverse osmosis in one or more reverse osmosis stages.

公开(公告)号：US20240246819A1

公开(公告)日：2024-07-25

申请号：US18564223

申请日：2022-05-25

申请人： CASALE SA

发明人： Raffaele OSTUNI ,  Pierdomenico BIASI ,  Alberto GARBUJO ,  Nicola PANZERI ,  Fabio OLDANI ,  Michal Tadeusz BIALKOWSKI

IPC分类号： C01B21/38 ,  B01J15/00

CPC分类号： C01B21/38 ,  B01J15/00

摘要： A process for the synthesis of nitric acid comprising the steps of treating ammonia in presence of oxygen or air to a catalytic oxidation step to yield a combusted gas, subjecting the combusted gas to a catalytic decomposition step to yield a N2O depleted gas stream, subjecting the N2O depleted gas stream to a cooling step to yield a cooled stream and subjecting said cooled stream to an absorption step in presence of water to yield a nitric acid and a tail gas retaining NOx; the catalytic decomposition step is carried out at a temperature comprises between 450° C. and 700° C. on one or more iron zeolites catalyst deposited, coated, or coextruded onto a catalyst support provided with gas permeable channels.

公开(公告)号：US20240208897A1

公开(公告)日：2024-06-27

申请号：US18288453

申请日：2022-04-26

申请人： Casale SA

发明人： Andrea Beretti ,  Maddalena Vernier ,  Riccardo Lanzani ,  Paolo Bertini

IPC分类号： C07C273/04 ,  C07C273/16

CPC分类号： C07C273/04 ,  C07C273/16

摘要： A urea stripper or evaporator provided with fittings in the bottom liquid holder to reduce gas carryover wherein said fittings may include one or more of: perforated screens horizontally arranged or vertically in the bottom liquid holder; a sealed chamber arranged in the liquid holder to reduce the liquid collection volume in the liquid holder: a plurality of blades and/or vertical plates projecting from the inner surface of a bottom domed end of the apparatus to reduce speed of the liquid flow.

公开(公告)号：US20240091728A1

公开(公告)日：2024-03-21

申请号：US18274785

申请日：2022-02-09

申请人： Casale SA

发明人： Enrico RIZZI

IPC分类号： B01J8/02

CPC分类号： B01J8/0214 ,  B01J2208/00805

摘要： A catalytic synthesis reactor is described, said reactor comprising a catalytic bed with an annular cylindrical shape delimited by a gas inlet header and a gas outlet header, wherein at least one of said headers has a multiple-wall structure comprising an outer perforated plate having a load-bearing function, an expanded metal plate acting as a spacing element, and a thin micro-perforated plate facing the catalyst and having a catalyst's retaining function.

公开(公告)号：US20240042480A1

公开(公告)日：2024-02-08

申请号：US18381001

申请日：2023-10-17

申请人： Casale SA

发明人： Federico Zardi

IPC分类号： B05D1/24 ,  B01J2/16 ,  B05C19/02

CPC分类号： B05D1/24 ,  B01J2/16 ,  B05C19/02

摘要： 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.

公开(公告)号：US11834422B2

公开(公告)日：2023-12-05

申请号：US17368540

申请日：2021-07-06

申请人： Casale SA

发明人： Andrea Scotto ,  Simone Gamba

IPC分类号： C07D251/60 ,  C07D251/62

CPC分类号： C07D251/62 ,  C07D251/60

摘要： A process for the purification of a melamine melt (5) containing melamine and by-products, comprising the steps of: (a1) In quenching of said melamine melt; (a2) decomposition of by-products with alkali, providing an alkaline aqueous solution of melamine (26); (b) stripping of said alkaline aqueous solution of melamine (26); (c) crystallization of melamine with a first alkali-containing solution (6b) and separation of solid melamine (7) from a mother liquor (8); (d) treatment of said mother liquor, providing a waste water stream (11) containing carbonates; (e) decomposition of at least part of the carbonates contained in said waste water stream (11) into carbon dioxide and alkali, providing a second alkali-containing aqueous solution (30); (f) recycle of at least part of said alkali-containing aqueous solution (30) to at least one of said steps (a1), (a2) and (c).

公开(公告)号：US20230331569A1

公开(公告)日：2023-10-19

申请号：US18006752

申请日：2021-09-10

申请人： CASALE SA

发明人： Maurizio RIZZI

IPC分类号： C01C1/04

CPC分类号： C01C1/0482 ,  C01C1/047

摘要： A process for synthesis of ammonia wherein an ammonia synthesis loop includes an ammonia converter where a makeup gas is reacted to form ammonia, and the loop is controlled at a partial load by reducing the synthesis pressure and maintaining the reduced pressure within a desired range by controlling a bypass line of make-up gas of the converter.

公开(公告)号：US20230322660A1

公开(公告)日：2023-10-12

申请号：US18037704

申请日：2021-08-31

申请人： Casale SA

发明人： Leonardo Marrone ,  Alberto Benedetti ,  Pierdomenico Biasi ,  Cristina Pizzolitto

IPC分类号： C07C275/62

CPC分类号： C07C275/62

摘要： A process for the production of biuret from urea wherein: a urea aqueous solution (24) withdrawn from the recovery section of a urea plant is processed to remove water and obtain a concentrated urea melt (25); said urea melt is processed under biuret-forming conditions to decompose urea into biuret and ammonia and obtain a high-biuret urea melt (26); said high-biuret urea melt (26) is diluted with water or with an aqueous stream obtaining a solution (28); the solution (28) is subject to crystallization and precipitation of a solid phase containing biuret which is separated from the aqueous phase.

公开(公告)号：US20230211312A1

公开(公告)日：2023-07-06

申请号：US17995011

申请日：2021-04-07

申请人： CASALE SA

发明人： Filippo Iocchi ,  Leonardo Marrone

IPC分类号： B01J19/24 ,  C01B3/34 ,  C01B3/02 ,  C01C1/04 ,  C07C273/04 ,  B01D53/14

CPC分类号： B01J19/245 ,  C01B3/34 ,  C01B3/025 ,  C01C1/0417 ,  C01C1/0488 ,  C07C273/04 ,  B01D53/1475 ,  B01J2219/00024 ,  C01B2203/0233 ,  C01B2203/0475 ,  C01B2203/068 ,  B01D2252/2041 ,  B01D2257/504

摘要： A method for revamping an ammonia-urea plant wherein: the ammonia section is modernized to produce an extra amount of low pressure steam; condensation stage of the high-pressure urea synthesis loop is modified to use part of the condensation heat of the urea stripper vapours to produce medium-pressure steam, said medium-pressure steam is fed to one or more steam users of the urea section, particularly for carbamate decomposition, the input of low-pressure steam to the urea section is balanced by importing the extra low-pressure steam produced in the ammonia section.