68 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
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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
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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A process for the production of biuret from urea wherein: a urea aqueous solution (24) withdrawn from the recovery section of a urea plant is processed to remove water and obtain a concentrated urea melt (25); said urea melt is processed under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
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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
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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
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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
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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
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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
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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
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27 Apr 23
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
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20 Apr 23
A process for synthesis of urea from ammonia and carbon dioxide wherein: the urea synthesis is performed with a stripping process in a synthesis loop including at least a reactor (1), a stripper (2) and a condenser (3); the reactor effluent is treated in the stripper to remove unreacted ammonia and carbon dioxide; the urea solution (14) from the stripper is sent to a low-pressure recovery section (4); the stripper vapours are split into a first portion (151) directed to the reactor and a second portion (152) sent to the condenser; the condenser (3) is a shell-and-tube kettle condenser where condensation of stripper vapours is performed in the tube side (30); a carbamate-containing effluent (20) from the condenser is returned to the reactor.
Leonardo Marrone, Paolo Bertini, Matteo Fumagalli
Filed: 9 Feb 21
Utility
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13 Apr 23
A process for producing nitric acid comprising: catalytic oxidation of ammonia in the presence of oxygen to form a nitrous gas containing NO, O2, N2O and water vapor; a catalytic abatement of N2O which is performed over a first catalyst; a catalytic conversion of NO into NO2 which is performed over a second catalyst; the so obtained nitrous gas is then subject to absorption in water to produce nitric acid.
Fabio OLDANI, Alberto GARBUJO, Pierdomenico BIASI
Filed: 24 Feb 21
Utility
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2 Mar 23
A reforming process comprising for production of a hydrogen-containing synthesis gas with a thermally integrated gas turbine engine wherein the hot exhaust gas of the gas turbine engine is the heat source for preheating one or more process streams of the reforming process.
Michele Corbetta, Michal Tadeusz Bialkowski, Francesco Baratto, Raffaele Ostuni
Filed: 26 Jan 21
Utility
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23 Feb 23
A process for purifying 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.
Leonardo Marrone, Alberto Benedetti, Paolo Bertini
Filed: 12 Jan 21
Utility
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19 Jan 23
Reactor for the high-pressure non-catalytic synthesis of melamine from urea, comprising coaxial inner reaction zone (6) and outer reaction zone (7) wherein a crude melamine is formed in the inner reaction zone and contacted with gaseous ammonia for stripping in the outer reaction zone, wherein a gaseous phase liberated in the outer zone is collected in a gas collection chamber (12) above the reaction zones, wherein the crude melamine melt is transferred from the inner zone into the outer zone via a submerged liquid passage below the liquid level to provide a liquid seal between the chambers.
Simone Gamba, Gbrile Di Carlo, Erico Rizzi
Filed: 17 Dec 20
Utility
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15 Dec 22
A prilling bucket for prilling of a liquid, particularly for urea, comprising a rotating assembly, a vibrating assembly, a magnetostrictive actuator disposed to impart vibration to said vibrating assembly, wherein said magnetostrictive actuator is part of the rotating assembly and is firmly connected with said vibrating assembly and the bucket comprises a slip connector arranged to transfer electrical power to said actuator.
Enrico Rizzi, Fabiano Montini
Filed: 3 Nov 20
Utility
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15 Dec 22
A reactor for the synthesis of urea comprising a vertical shell and perforated baffles or trays (3) arranged to define compartments of the reactor, wherein each baffle comprises an array of individual perforated tiles (10) wherein each tile (101) comprises side walls (101A-101D) and a top face (101F), the side walls having first perforations for the liquid and said top face having second perforations for the gas, wherein said second perforations are smaller than said first perforations, and the tiles are distributed over the baffle with a two-dimensional pattern where adjacent tiles are separated by gaps (17).
Mario Dente, Leonardo Marrone, Federico Maffietti
Filed: 9 Jun 20
Utility
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8 Dec 22
A process for synthesis of ammonia including generation of makeup gas in a frontend and conversion of said makeup gas in an ammonia synthesis loop including a circulator, a converter, a condensation section and a liquid ammonia separation section, including: when the loop operates at a partial load and a flow rate of makeup gas transferred from the front end to the synthesis loop is reduced, the loop is controlled by separating a gas stream from a converter feed line at a point upstream of the converter thus forming a bypass stream; reintroducing said bypass stream at the suction side of the circulator or at a point of the loop downstream of said separation section.
Maurizio Rizzi
Filed: 12 Oct 20
Utility
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20 Oct 22
A method for controlling a prilling bucket in the prilling of a a urea melt (UM) including: feeding the urea melt to a prilling bucket (1) which vibrates under the action of a magnetostrictive device (2), wherein the vibration of the bucket is controlled, as a function of the amount of urea melt to be prilled, by the following steps: acquisition of a time-varying input signal (3) which represents the flow rate of urea melt fed to the prilling bucket; generation of a first signal (5) and of a second signal (6), independently from each other, as a function of said input signal (3); generation of a third signal (10) having a frequency which is modulated by said first signal and an magnitude which is modulated by said second signal, and use of said third signal to drive said magnetostrictive device (2).
Leonardo Marrone
Filed: 1 Sep 20