124 patents
Utility
Ammonia Burner for Nitric Acid Production
4 Jan 24
An ammonia burner comprising an ammonia section for ammonia oxidation and a combined heat exchange section for heating a process stream, wherein said ammonia section and heat exchange section are coaxially arranged in a pressure vessel of the burner and the hot nitrogen oxides-containing effluent gas from the ammonia section is directed to a shell side of the heat exchange section so that said effluent gas transfers heat to the process stream.
Enrico RIZZI
Filed: 20 Oct 21
Utility
Urea Prilling Process
4 Jan 24
A process of prilling of a urea melt comprising the use of calcium lignosulfonate or carboxymethyl starch as additive to obtain a formaldehyde-free urea product.
Leonardo Marrone, Andrea Beretti
Filed: 10 Sep 21
Utility
Process for quenching offgas of melamine synthesis
2 Jan 24
A process for the synthesis of melamine from urea, preferably of the high-pressure type, wherein offgas quenching is performed in a quenching vessel wherein in the upper part of the vessel, a rising flow of offgas is contacted in counter-current with liquid ammonia to obtain precipitation of melamine contained in the offgas and melamine-free anhydrous washed offgas; in the lower part of the vessel, the solid melamine is contacted with a liquid solvent to form a solution of melamine or a melamine slurry.
Simone Gamba
Filed: 2 Mar 21
Utility
Process for melamine purification
12 Dec 23
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).
Andrea Scotto, Simone Gamba
Filed: 6 Jul 21
Utility
Method for revamping a catalytic converter
5 Dec 23
A method for revamping a catalytic converter wherein: said catalytic converter comprises a pressure vessel and a catalytic cartridge containing at least one catalyst bed, the pressure vessel includes a cylindrical shell with a full aperture and includes a removable cover of said aperture, and the catalytic cartridge is removable through said upper aperture, and the method includes: installing an additional shell over the aperture of the original shell, thus obtaining an axially extended shell of the pressure vessel; providing an axially extended catalytic cartridge having an axially extended room for holding catalyst in the so obtained axially extended shell.
Francesco Formentini
Filed: 18 Feb 20
Utility
Process for melamine purification
5 Dec 23
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).
Andrea Scotto, Simone Gamba
Filed: 6 Jul 21
Utility
Shell and tube heat exchanger
28 Nov 23
A shell and tube apparatus (1) includes an outer shell (2); a first tube bundle (3) and a second tube bundle (4) coaxial with each other; a first inner shell (5) and a second inner shell (6); the first inner shell surrounds the first tube bundle and is arranged between the two tube bundles; the second inner shell surrounds the second tube bundle and is arranged in the space between the second tube bundle and the outer shell (2); the first tube bundle (3) operates as a preheater; the second tube bundle (4) operates as a boiler; the coaxial inner shells (5, 6) define a counterflow path for a hot fluid which passes through the shell side.
Cristiano Caselli, Luca Redaelli
Filed: 7 Mar 19
Utility
Control of an Ammonia Synthesis Loop at Partial Load
19 Oct 23
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.
Maurizio RIZZI
Filed: 10 Sep 21
Utility
Process for Producing Biuret from Urea
12 Oct 23
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.
Leonardo Marrone, Alberto Benedetti, Pierdomenico Biasi, Cristina Pizzolitto
Filed: 31 Aug 21
Utility
Process for Producing Feed-grade Urea
28 Sep 23
A process for the production of feed grade urea starting from a liquid urea melt, the process comprising processing the urea melt (6) to promote the formation of biuret until a concentration of at least 3% biuret, and subjecting the so obtained biuret-containing urea melt (8) to a shaping process to obtain a granular urea product.
Leonardo Marrone
Filed: 10 Sep 21
Utility
Wall Assembly for Catalytic Beds of Synthesis Reactors
14 Sep 23
Gas-permeable assembly (10) for retaining a fine granular catalyst (1) comprising: a first wall (2) arranged to face the catalyst, a second wall spaced from the first wall (4) and arranged to be opposed to the catalyst, a catalyst-retaining core (3) interposed between said first wall and second wall.
Nicola Panzeri
Filed: 9 Aug 21
Utility
Method for removing nitrogen oxides from a gas
12 Sep 23
A method for removing nitrogen oxides NOx from a gaseous current, comprising the steps of: passing the gaseous current through a de-NOx catalytic bed with iron exchanged zeolite as a catalyst with the addition of ammonia as a reducing agent, wherein the molar ratio of NH3 over NOx is greater than 1.33.
Jean Francois Granger
Filed: 12 Apr 21
Utility
Process for methanol production
5 Sep 23
Process for the synthesis of methanol comprising: reforming a hydrocarbon feedstock into a synthesis gas containing carbon oxides and hydrogen in a molar ratio (H2—CO2)/(CO+CO2) lower than 1.7; elevating said molar ratio to a value of at least 1.9; compressing said synthesis gas and converting the same into crude methanol; separating said crude methanol into a liquid stream of methanol and a gaseous stream containing unreacted synthesis gas; subjecting at least 50% (vol) of said gaseous stream to hydrogen recovery and mixing the recovered hydrogen with said synthesis gas in order to elevate its molar ratio to a value of at least 1.9.
Maddalena Lepri, Pietro Moreo, Raffaele Ostuni
Filed: 31 Jan 18
Utility
Multi-bed Catalytic Reactor
13 Jul 23
A multi-bed catalytic reactor, particularly for the synthesis of ammonia, wherein the beds have an annular shape, the first bed has L(1)*(V/V(1)) equal to or greater than 50 wherein L(1) is the slenderness ratio of the first bed which is calculated as the axial length over the radial width; V is the total volume of the beds of the reactor and V(1) is the volume of the first bed.
Enrico Rizzi, Matteo Masanti
Filed: 22 Jun 21
Utility
Multi-bed Ammonia Converter
6 Jul 23
A multi-bed ammonia converter comprising a plurality of catalytic beds for converting an input makeup gas into an ammonia-containing product gas comprising a recovery heat exchanger such as a steam superheater or a boiler which is integrated in the ammonia converter and can be partially accommodated in the cavity of an annular bed.
Enrico Rizzi, Matteo Masanti
Filed: 22 Jun 21
Utility
Revamping of Ammonia-urea Plants
6 Jul 23
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.
Filippo Iocchi, Leonardo Marrone
Filed: 7 Apr 21
Utility
Use of Ferritic Steel In the High Pressure Section of Urea Plants
29 Jun 23
Use of a ferritic stainless steel containing at least 23% chromium for the manufacture of components of the high-pressure urea synthesis section of a urea plant.
Leonardo Marrone
Filed: 16 Mar 21
Utility
Reactor with a catalytic bed
27 Jun 23
A catalytic bed for a chemical reactor, said catalytic bed having an annular-cylindrical geometry and comprising at least one collector made with a gas-permeable cylindrical wall, containing at least a first catalyst and a second catalyst, wherein the second catalyst has a finer particle size than the first catalyst, and wherein the first catalyst forms a layer of catalyst adjacent to and in contact with said collector.
Enrico Rizzi
Filed: 23 May 18
Utility
Method of revamping of a plant for distillation of methanol
16 May 23
Method for revamping a refining section of a methanol distillation plant comprising a medium pressure (MP) column a low pressure (LP) column, wherein both said columns comprise at least one bottom boiler, a gaseous stream of distilled methanol withdrawn from the MP column is fed to at least one bottom boiler of the LP column and a liquid solution containing methanol withdrawn from the MP column is fed to the LP column, the method of revamping comprising the installation of a high pressure (HP) column; the installation of a line feeding a gaseous stream of distilled methanol from the HP column to at least one bottom boiler of the MP column and the installation of a bottom line for exporting from the HP column a liquid stream consisting essentially of water.
Raffaele Ostuni
Filed: 10 Apr 19
Utility
Multi-bed catalytic converter
9 May 23
A multi-bed catalytic converter comprising: a plurality of catalytic beds which are traversed in series by a process gas, sequentially from a first catalytic bed to a last catalytic bed of said plurality, and at least one inter-bed heat exchanger (7) positioned between a first catalytic bed and a second catalytic bed of said plurality, wherein at least the last catalytic bed of said plurality is adiabatic and is made of fine catalyst with a particle size not greater than 2 mm.
Francesco Baratto, Pierdomenico Biasi, Davide Carrara, Sergio Panza
Filed: 11 Dec 18