68 patents
Page 2 of 4
Utility
Process and Reactor for Catalytic Oxidation of Ammonia
20 Oct 22
A process for the catalytic oxidation of ammonia, comprising: passing an ammonia-containing gas, in the presence of oxygen, over a catalyst contained in a reactor, obtaining a process gas containing nitrogen oxides, and cooling said process gas with a heat exchanger accommodated in the reactor, wherein a portion of said process gas, located in the shell side, bypasses the heat exchanger and forms a hot current which mixes with cooled gas downstream the heat exchanger, and the bypass is regulated on the basis of a target outlet temperature of the mixed process gas.
Iacopo Cerea, Ermanno Filippi, Luca Redaelli, Pasquale Talarico
Filed: 16 Sep 20
Utility
a Method for Measuring a Liquid Level In a Pressure Vessel
13 Oct 22
A method for measuring a liquid level (L) in a pressure vessel (2) the method comprising: providing a thermometric well (10) inside the pressure vessel, heating an inner surface of the thermometric well which is not in contact with the fluid, detecting the temperature of at least one detection point of said inner surface; estimating a position of the liquid level based on the difference between a reference temperature and the temperature so detected.
Paolo Bertini, Andrea Scotto, Gabriele Di Carlo
Filed: 20 Jul 20
Utility
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11 Aug 22
A process for synthesis of urea from ammonia and carbon dioxide comprising the synthesis of urea in parallel in a first urea reactor (1) at a first urea synthesis pressure and in a second urea reactor (2) at a second and lower urea synthesis pressure; a stripping step of the reaction effluent of the first reactor, which is performed in a stripper (4) operating at a stripping pressure lower than the first urea synthesis pressure; the reaction effluent (21) of the second reactor (2) and the stripper liquid effluent (11) are sent to a recovery section (13) where a carbamate-containing recycle solution (17) is produced, and said recycle solution (17) is sent partly to said first reactor and partly to said second reactor.
Leonardo Marrone, Paolo Bertini
Filed: 9 Jun 20
Utility
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21 Jul 22
A dual-pressure plant for the synthesis of nitric acid comprising: a reactor (4) providing a gaseous effluent (15) containing nitrogen oxides; an absorption tower (6) nitrogen oxides react with water providing raw nitric acid and, said absorption tower operating at a pressure greater than the pressure of the reactor; a compressor (5) elevating the pressure of the reactor effluent (15) to the absorption pressure; said plant also comprising a first bleacher (37) and a second bleacher (7), said first bleacher (37) stripping with air (39) nitrogen oxides from the output stream (27) of the absorption tower (6) providing a partially stripped nitric acid stream (40) and a nitrogen oxides-loaded air stream (41), the former being fed to the second bleacher (7) and the latter being recycled to the delivery-side of said compressor (5).
Iacopo Cerea, Jean Francois Granger
Filed: 4 Apr 22
Utility
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14 Jul 22
A dual-pressure plant for the synthesis of nitric acid comprising: a reactor (4) providing a gaseous effluent (15) containing nitrogen oxides; an absorption tower (6) nitrogen oxides react with water providing raw nitric acid and, said absorption tower operating at a pressure greater than the pressure of the reactor; a compressor (5) elevating the pressure of the reactor effluent (15) to the absorption pressure; said plant also comprising a first bleacher (37) and a second bleacher (7), said first bleacher (37) stripping with air (39) nitrogen oxides from the output stream (27) of the absorption tower (6) providing a partially stripped nitric acid stream (40) and a nitrogen oxides-loaded air stream (41), the former being fed to the second bleacher (7) and the latter being recycled to the delivery-side of said compressor (5).
Iacopo Cerea, Jean Francois Granger
Filed: 4 Apr 22
Utility
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16 Jun 22
A pressure swing adsorption process (PSA) comprising the following steps: feeding an input gas containing H2, CO2 and impurities through a CO2 adsorbent material in a pressure vessel under a high pressure; withdrawing a first H2-rich product gas due to adsorption of CO2 in the adsorbent material; setting the pressure to an intermediate pressure causing the adsorbent material release a second gas stream; passing a CO2-rich purge stream through the adsorbent material, obtaining a purge gas; setting the pressure to a sub-atmospheric low pressure, so that a CO2-rich product gas is released under vacuum by the adsorbent material; re-pressurizing the vessel to said high pressure; said steps being performed cyclically in a pressure vessel or in a plurality of parallel pressure vessels of a multiple vessel setup.
Anne Streb, Max Hefti, Matteo Gazzani, Marco Mazzotti
Filed: 21 Apr 20
Utility
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26 May 22
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
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12 May 22
A process of granulation of a urea melt, comprising: adding a first additive containing carboxymethyl starch to one or more first stage(s) of the granulation process, to form a carcarboxymethyl starch containing inner layer of urea granules, and adding a second additive containing calcium lignosulfonate to one or more second stage(s) of the granulation process, downstream said first stages, to form granules with a coating containing calcium lignosulfonate.
Leonardo Marrone, Andrea Beretti
Filed: 24 Jan 22
Utility
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21 Apr 22
A method for the suppression of soot formation during the partial oxidation of a hydrocarbon-containing gaseous feed, in the presence of steam and in an ATR reactor or in a POX reactor, the method comprising the addition of gaseous carbon dioxide to the hydrocarbon-containing gaseous feed before entry into the reactor.
Luca Zanichelli, Giacomo Colmegna
Filed: 18 Feb 20
Utility
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31 Mar 22
A process of partial oxidation is performed in a reactor which includes a reaction chamber and a burner assembly, wherein: the burner assembly has a single oxidant nozzle located within an fuel channel, said oxidant nozzle comprises a nozzle pipe and a nozzle outlet, the nozzle pipe and the fuel channel are arranged to produce a diffusion flame, the nozzle outlet has a shape with two or more elongate lobes projecting from a center of the nozzle pipe.
Luca Zanichelli, Giacomo Colmegna
Filed: 19 Dec 19
Utility
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10 Mar 22
Method for producing solid urea by granulation, wherein the granulation is fed with liquid urea having a purity greater than 98% by weight and not containing formaldehyde.
Gianfranco Bedetti
Filed: 15 Nov 21
Utility
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10 Feb 22
A perforated-tray column wherein each tray comprises downcomer pipes for conveying a downwardly flowing liquid to a next tray, wherein the downcomer pipe includes: a first portion extending above the perforated tray, a second portion extending below the perforated tray towards the next perforated tray, and an end guard to prevent a gaseous phase from entering the downward pipe.
Sergio PANZA
Filed: 30 Jul 19
Utility
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3 Feb 22
Reactor for catalytic chemical reactions comprising a catalyst bed with an annular-cylindrical form crossed by a radial flow or mixed axial-radial flow, wherein the bed is delimited by cylindrical walls made gas-permeable by means of slits and the catalyst bed is formed by particles of catalyst with a nominal minimum size such that: the ratio between a transverse dimension of the slits and the nominal minimum size of the particles of catalyst is smaller than or equal to 0.6; the catalyst bed contains no more than 3% by weight of particles with an actual size smaller than said nominal size.
Sergio PANZA, Pierdomenico BIASI, Ermanno FILIPPI
Filed: 7 Oct 19
Utility
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23 Dec 21
A process for synthesis of urea from CO2 and NH3 wherein a steam flow (13) produced in the condenser (3) of a high-pressure synthesis loop is compressed to raise its pressure and temperature before using the steam as a heat source for a downstream step of the process.
Leonardo Marrone
Filed: 7 Nov 19
Utility
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28 Oct 21
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
5ff63m5 qc0931qwsz0ogaxb8wwcgua5ws
28 Oct 21
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
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14 Oct 21
A process of granulation of a urea melt, comprising: adding a first additive containing carboxymethyl starch to one or more first stage(s) of the granulation process, to form a carboxymethyl starch containing inner layer of urea granules, and adding a second additive containing calcium lignosulfonate to one or more second stage(s) of the granulation process, downstream said first stages, to form granules with a coating containing calcium lignosulfonate.
Leonardo Marrone, Andrea Beretti
Filed: 28 Jun 19
Utility
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26 Aug 21
A process for the synthesis of ammonia from a hydrocarbon feedstock, wherein the process includes reforming the hydrocarbon feedstock to produce a make-up gas and converting said make-up gas into ammonia, the process is performed in an ammonia synthesis plant requiring an electric power for operation and also requiring a start-up power (Ps) for start-up, wherein a first electric power (P1) is internally produced in the ammonia plant, and a second electric power (P2) is imported, wherein said second electric power is equal to or greater than said start-up power (Ps).
Umberto Rossi, Alessandra Pennati, Raffaele Ostuni, Costantino Bruni
Filed: 16 Jul 19
Utility
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19 Aug 21
Integrated process comprising: synthesis of methanol from a methanol synthesis gas (12); synthesis of ammonia from an ammonia make-up gas (25), and synthesis of carbon monoxide from a methane-containing stream, wherein: the synthesis of methanol provides a liquid stream of methanol (13) and a gaseous stream (14) of unreacted synthesis gas; a portion (14a) of said gaseous stream is separated as purge gas; said purge gas is subjected to a hydrogen recovery step, providing a hydrogen-containing stream (19) which is used as a hydrogen source for making the ammonia make-up gas, and a tail gas (20) which is used as a methane source for the synthesis of carbon monoxide by oxidation of a methane-containing stream.
Pietro Moreo
Filed: 10 Apr 19
Utility
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19 Aug 21
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