Disclosed is a particulate, urea-containing composition, to a method and apparatus for producing it, to the use thereof as fertilizer, as technical urea or as feed additive, and to the use of an additive for producing a particulate, urea-containing composition.
C05C 9/00 - Fertilisers containing urea or urea compounds
A61K 31/17 - Amides, e.g. hydroxamic acids having the group N—C(O)—N or N—C(S)—N, e.g. urea, thiourea, carmustine
A61K 47/08 - Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing oxygen
A61K 47/34 - Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyesters, polyamino acids, polysiloxanes, polyphosphazines, copolymers of polyalkylene glycol or poloxamers
A61K 47/32 - Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. carbomers
A61K 47/12 - Carboxylic acidsSalts or anhydrides thereof
A61K 9/00 - Medicinal preparations characterised by special physical form
C05G 3/00 - Mixtures of one or more fertilisers with additives not having a specifically fertilising activity
B01J 2/16 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic by suspending the powder material in a gas, e.g. in fluidised beds or as a falling curtain
B01J 2/00 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic
A23K 40/10 - Shaping or working-up of animal feeding-stuffs by agglomerationShaping or working-up of animal feeding-stuffs by granulation, e.g. making powders
A23K 50/15 - Feeding-stuffs specially adapted for particular animals for ruminants containing substances which are metabolically converted to proteins, e.g. ammonium salts or urea
The invention relates to a particulate urea-containing composition, to a method and a device for producing same, to the use thereof as fertilizer, as technical urea, or as a feed additive, and to the use of an additive for producing a particulate urea-containing composition. The particulate composition contains (i) urea and an additive comprising one or both of the components (ii) and (iii): wherein (ii) is a combination of at least one amino group-containing polymer or oligomer and at least one functionalized polyvinyl compound; (iii) is at least one aliphatic C2-C8 dialdehyde; and the weight proportion of the component (i) is > 60 wt.% and the weight proportion of the sum of the components (ii) and (iii) in the composition is < 1 wt.%. The additive can also comprise a component (iv): wherein (iv) is at least one compound selected from the group of aliphatic dicarboxylic acids, the salts and anhydrides thereof, aliphatic tricarboxylic acids, the salts anhydrides thereof, aromatic dicarboxylic acids, the salts and anhydrides thereof, and aldehyde acids, and the salts and anhydrides thereof, and the weight proportion of the component (i) is > 60 wt.% and the weight proportion of the sum of the components (ii), (iii), and (iv) in the composition is < 1 wt.%.
C05C 9/00 - Fertilisers containing urea or urea compounds
C07C 273/14 - SeparationPurificationStabilisationUse of additives
A23K 1/22 - containing chemicals which are converted to proteins by cattle, e.g. ammonium salts, urea
C05G 3/00 - Mixtures of one or more fertilisers with additives not having a specifically fertilising activity
B01J 2/30 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic using agents to prevent the granules sticking togetherRendering particulate materials free flowing in general, e.g. making them hydrophobic
3.
REACTOR FOR PRODUCING NITROGEN-CONTAINING FERTILIZER GRANULES
Suggested is a reactor for producing nitrogen-containing fertilizer granules, wherein the inside walls of said reactor are coated with a layer of at least one organic silica compound.
B01J 8/38 - Chemical or physical processes in general, conducted in the presence of fluids and solid particlesApparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed containing a rotatable device or being subject to rotation
B01J 19/02 - Apparatus characterised by being constructed of material selected for its chemically-resistant properties
C05C 9/00 - Fertilisers containing urea or urea compounds
4.
Method for reducing the visible downwind detached plume opacity
B01J 2/00 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic
C05C 9/00 - Fertilisers containing urea or urea compounds
5.
METHOD FOR REDUCING THE VISIBLE DOWNWIND DETACHED PLUME OPACITY
The invention relates to a method for reducing aerosol emissions from a urea granulation plant with a recovery of the resulting scrubber bleeds, with • a granulator producing urea from a concentrated urea solution and an evaporation of the included water, giving urea granulates and an exhaust of dust, ammonia and ammonium cyanate, and • a following scrubbing or removing stage for the dust, and • a following scrubbing acid stage, resulting in a first stream comprising mainly aerosols and a second stream comprising ammonium salts, and • a following aerosol stage with spray and collection devices, releasing a first stream of an exhaust of air, and a second stream of ammonium cyanate and water, and • the second stream of the aerosol stage of ammonium cyanate and water is recovered into the urea granulation plant or into a urea fertilizer plant.
A method for producing urea granules having low moisture absorption capacity, with a urea granulator, having a granule flow inlet side and oppositely a granule flow outlet side, forming an axis alongside which granules from a urea solution and a urea/ammonium salt-stream are formed, whereby the solution and the salt-stream are sprayed as a mixture or separately via a feed system unit via various nozzles into the granulator onto a seed material. In this process the highest amount of the salt-stream is sprayed into the granulator at the granule flow inlet side and the amount of the salt-stream is decreased alongside the axis of the granulator from the granule flow inlet side to the granule flow outlet side.
Urea granulation process with scrubbing system including at least one gaseous waste stream for removal of dust and ammonia whereby this waste stream is processed through a combination of the following process steps comprising (a) washing the dust and ammonia laden stream (4) with water and/or an aqueous urea solution whereby a dust-laden liquid stream (26) and a dust-reduced stream (5) is generated, and (b) reacting the dust-reduced stream (5) with formaldeyhde (7) to form a stream (8) comprising hexamethylenetetramine and urea-formaldehyde and clean off-gas (6) wherein the gas stream is directed first through process step (a) and then through process step (b).
B01J 2/00 - Processes or devices for granulating materials, in generalRendering particulate materials free flowing in general, e.g. making them hydrophobic
8.
METHOD FOR PRODUCING UREA FERTILIZER WITH LOW MOISTURE ABSORPTION TENDENCIES
A method for producing urea granules having low moisture absorption capacity, with a urea granulator, having a granule flow inlet side and oppositely a granule flow outlet side, forming an axis alongside which urea granules from a urea solution and a urea / ammonium salt-stream are formed, whereby the urea solution and the urea / ammonium salt-stream are sprayed as a mixture or separately via a feed system unit via various nozzles into the urea granulator onto a seed material. In this process the highest amount of the urea / ammonium salt-stream is sprayed into the urea granulator at the granule flow inlet side and the amount of the urea / ammonium salt-stream is decreased alongside the axis of the urea granulator from the granule flow inlet side to the granule flow outlet side, whereby the urea / ammonia salt-stream comprises a urea : ammonium salt ratio between 4 and 20, a water content of 0 - 10 % by weight and optionally up to 1 - 5 % by weight additives, and the highest amount of the urea solution is sprayed into the urea granulator at the granule flow outlet side and the amount of the urea solution is decreased alongside the axis of the urea granulator from the granule flow outlet side to the granule flow inlet side.
A urea granulation process and the apparatus suitable for operating that process integrates a method for reducing ammonia emissions from a urea granulation plant which is emitted by a urea production process by scrubbing the off-gas and recovering the scrubber bleed and integrating it into the granulation process so that ammonium salts are completely contained by the process.
B01J 19/00 - Chemical, physical or physico-chemical processes in generalTheir relevant apparatus
C07C 273/00 - Preparation of urea or its derivatives, i.e. compounds containing any of the groups the nitrogen atoms not being part of nitro or nitroso groups
10.
Method for reducing aerosol emissions in a urea granulation plant
The invention relates to a process for the granulation of a concentrated urea solution whereas the granulation produces a urea granulate and a dust laden air, which is then fed into a dust scrubber which removes the coarser dust with a less concentrated urea solution and which releases a residual air comprising air with ammonia, carbon dioxide water and an aerosol comprising mainly ammonium isocyanate and a part of very fine urea sublimate, whereas the aerosol is then separated off and fed into a isomerisation unit which comprises a stripping where the ammonium isocyanate reacts with steam to form urea which is then redirected into the dust scrubber as a less concentrated urea solution, and the residual air is directed into an acidic scrubber which releases clean air into the atmosphere which finally leads to a recycling of the aerosol of ammonium isocyanate into urea. The invention also relates to a device for carrying out the related process.
C07C 273/02 - Preparation of urea or its derivatives, i.e. compounds containing any of the groups the nitrogen atoms not being part of nitro or nitroso groups of urea, its salts, complexes or addition compounds
C05C 9/00 - Fertilisers containing urea or urea compounds
Urea granulation process with scrubbing system including several waste streams for removal of dust and ammonia from the off-gas of a urea granulation unit comprising a urea granulator (1), a granulator scrubber dust stage (2), a granulator scrubber acid stage (3), product coolers (5), a product cooler scrubber dust stage (4), an evaporation unit (6), and a condenser unit (7). Thereby a first stream of fresh air (8), running through a first sequence of process steps, is send into the urea granulator (1), whereby dust- and ammonia-laden air (9) is drawn off from the granulator (1) and conveyed into a granulator scrubber dust stage (2), followed by a granulator scrubber acid stage (3), in which stage the ammonia-laden air (12) is contacted with an acid in liquid (22) phase and ammonia is scrubbed from that air by the generation of an ammonium salt. A second stream of fresh air (15), running through a second sequence of process steps, is used for cooling the product drawn off from the urea granulator (1), whereby said cooling is performed in product coolers (5), thereby said air is heated up, and afterwards is conveyed to a product cooler scrubber dust stage (4). The clean off-gas (13) drawn off from the granulator scrubber acid stage (3), and the clean off-gas (18) drawn off from the product cooler scrubber dust stage (4), are released into the atmosphere (19). Hereby the scrubbing system is passed, which in itself is a complete closed system, and totally decoupled from urea synthesis, whereby the ammonium salt solution stream (23) from the granulator scrubber acid stage (3), is fed into said product cooler scrubber dust stage (4), whereby the ammonia of the dust-laden air stream (17) exiting the product coolers (5) is removed, and the released liquor (24) from the product cooler scrubber dust stage(4) and the released liquor (11) from the granulator scrubber dust stage (2) is send to the evaporation unit (6). The vapour stream (29) from the evaporation unit (6), which contains ammonia is given into the condenser unit (7), which releases a liquid process condensate (30), and said liquid process condensate (30) is given into the granulator scrubber acid stage (3), and the concentrated liquor stream (28) from the evaporation unit (6), containing urea and ammonium salt, and a urea melt (26) from a synthesis unit (27) are conveyed into the urea granulator (1), separately. Thereby the ammonium salt contained in the concentrated liquor stream (28) is integrated into the granulated urea product.
The invention relates to a process for the granulation of a concentrated urea solution whereas the granulation produces a urea granulate and a dust laden air, which is then fed into a dust scrubber which removes the coarser dust with a less concentrated urea solution and which releases a residual air comprising air with ammonia, carbon dioxide water and an aerosol comprising mainly ammonium isocyanate and a part of very fine urea sublimate, whereas the aerosol is then separated off and fed into a isomerisation unit which comprises a stripping where the ammonium isocyanate reacts with steam to form urea which is then redirected into the dust scrubber as a less concentrated urea solution, and the residual air is directed into an acidic scrubber which releases clean air into the atmosphere which finally leads to a recycling of the aerosol of ammonium isocyanate into urea. The invention also relates to a device for carrying out the related process.
Urea granulation process with scrubbing system including several waste streams for removal of dust and ammonia from the off-gas of a urea granulation unit comprising a urea granulator (1), a granulator scrubber dust stage (2), a granulator scrubber acid stage (3), product coolers (5), a product cooler scrubber dust stage (4), an evaporation unit (6), and a condenser unit (7). Thereby a first stream of fresh air (8), running through a first sequence of process steps, is send into the urea granulator (1), whereby dust- and ammonia-laden air (9) is drawn off from the granulator (1) and conveyed into a granulator scrubber dust stage (2), followed by a granulator scrubber acid stage (3), in which stage the ammonia-laden air (12) is contacted with an acid in liquid (22) phase and ammonia is scrubbed from that air by the generation of an ammonium salt. A second stream of fresh air (15), running through a second sequence of process steps, is used for cooling the product drawn off from the urea granulator (1), whereby said cooling is performed in product coolers (5), thereby said air is heated up, and afterwards is conveyed to a product cooler scrubber dust stage (4). The clean off-gas (13) drawn off from the granulator scrubber acid stage (3), and the clean off-gas (18) drawn off from the product cooler scrubber dust stage (4), are released into the atmosphere (19). Hereby the scrubbing system is passed, which in itself is a complete closed system, and totally decoupled from urea synthesis, whereby the ammonium salt solution stream (23) from the granulator scrubber acid stage (3), is fed into said product cooler scrubber dust stage (4), whereby the ammonia of the dust-laden air stream (17) exiting the product coolers (5) is removed, and the released liquor (24) from the product cooler scrubber dust stage(4) and the released liquor (11) from the granulator scrubber dust stage (2) is send to the evaporation unit (6). The vapour stream (29) from the evaporation unit (6), which contains ammonia is given into the condenser unit (7), which releases a liquid process condensate (30), and said liquid process condensate (30) is given into the granulator scrubber acid stage (3), and the concentrated liquor stream (28) from the evaporation unit (6), containing urea and ammonium salt, and a urea melt (26) from a synthesis unit (27) are conveyed into the urea granulator (1), separately. Thereby the ammonium salt contained in the concentrated liquor stream (28) is integrated into the granulated urea product.
A method for producing urea granules having low moisture absorption capacity, with a urea granulator, having a granule flow inlet side and oppositely a granule flow outlet side, forming an axis alongside which urea granules from a urea solution and a urea / ammonium salt-stream are formed, whereby the urea solution and the urea / ammonium salt-stream are sprayed as a mixture or separately via a feed system unit via various nozzles into the urea granulator onto a seed material. In this process the highest amount of the urea / ammonium salt-stream is sprayed into the urea granulator at the granule flow inlet side and the amount of the urea / ammonium salt-stream is decreased alongside the axis of the urea granulator from the granule flow inlet side to the granule flow outlet side, whereby the urea / ammonia salt-stream comprises a urea : ammonium salt ratio between 4 and 20, a water content of 0 - 10 % by weight and optionally up to 1 - 5 % by weight additives, and the highest amount of the urea solution is sprayed into the urea granulator at the granule flow outlet side and the amount of the urea solution is decreased alongside the axis of the urea granulator from the granule flow outlet side to the granule flow inlet side.
The invention relates to a particulate, urea-containing composition, to a method and apparatus for producing it, to the use thereof as fertilizer, as technical urea or as feed additive, and to the use of an additive for producing a particulate, urea- containing composition. The particular, urea-containing composition comprises an additive component (ii) and one or both of components (iii) and (iv): where component (ii) is a combination of polyethylenimine and polyvinyl alcohol or combination of polyethylenimine and polyvinylamine; component (iii) is at least one aliphatic C2-C8 dialdehyde; and component (iv) is at least one compound selected from the group consisting of aliphatic clicarboxylic acids, aliphatic tricarboxylic acids, aromatic dicarboxylic acids, aldehydic acids, and salts and anhydrides thereof.
C05C 9/00 - Fertilisers containing urea or urea compounds
C05G 3/00 - Mixtures of one or more fertilisers with additives not having a specifically fertilising activity
C05G 3/20 - Mixtures of one or more fertilisers with additives not having a specifically fertilising activity for preventing the fertilisers being reduced to powderAnti-dusting additives
C05G 5/10 - Solid or semi-solid fertilisers, e.g. powders
patents
