Yara International Patente

The present disclosure provides a computer-implemented method for controlling ammonium nitrate production, comprising mixing a stream of ammonia and a stream of nitric acid to form a biphasic composition, the biphasic composition comprising an aqueous solution and an exhaust gas, the aqueous solution comprising ammonium nitrate and the exhaust gas comprising water, ammonium nitrate and ammonia, condensing the exhaust gas to form a process condensate, measuring online variables of the process condensate, estimating the exhaust gas composition based on the measured online variables, estimating the value of at least one variable of the biphasic composition based on the estimated exhaust gas composition, and adjusting at least one process parameter such that the estimated value is within a desired range, preferably at a desired value.

The present disclosure discloses a catalytic system comprising: a Pt-containing, Pd-containing, and/or Rh-containing catalyst; and a recovery system downstream of the catalyst; wherein the recovery system comprises at least one oxide of formula A'<1-x>A"<x>BO<3>, with A' being selected from lanthanoids, preferably A' being selected from La, Sm and Gd; A" being selected from alkaline earth metals, preferably A" being Sr or Ca; B being selected from 3d-5d elements, preferably B being selected from Cr, Mn, Fe, and Co; and wherein x = 0 to 1. The present disclosure further relates to the use of said oxides for recovering volatile Pt, Pd and/or Rh and to a method for recovering volatile Pt, Pd and/or Rh.

The present disclosure relates to method to remove water during production of a ternary molten salt mixture, comprising at least calcium nitrate and potassium nitrate where the calcium nitrate in the form of a hydrated calcium nitrate or a hydrated calcium nitrate / potassium nitrate double salt. Foaming can be reduced by controlling the interaction between water evolving from the calcium nitrate and the potassium nitrate, more particularly to impurities present in the potassium nitrate.

The present disclosure provides a process for regenerating a dryer of a syngas dryer assembly comprising one or more dryers in an ammonia plant (100), the process comprising steps of: (i) contacting a charge of desulphurized natural gas (1) and steam (2), with air, oxygen-enriched air or oxygen, in a conversion section resulting in a synthesis gas comprising hydrogen, CO and CO<2>, the conversion section comprising at least one furnace; (ii) subjecting the synthesis gas obtained in step (i) to shift conversion, carbon dioxide removal and methanation, thereby obtaining a stream of treated syngas (7') and further passing the treated syngas (7') through a first syngas compressor (8) to obtain a compressed syngas (8'); (iii) introducing the compressed syngas (8') to a first dryer (9) of the syngas dryer assembly, located downstream of the first syngas compressor (8) to absorb water resulting in a dried make-up syngas, wherein the syngas dryer assembly further comprises a second dryer (14) positioned in parallel to the first dryer (9), wherein the second dryer is a saturated dryer requiring regeneration, wherein a part of the dried make-up syngas (9") is compressed in a second syngas compressor (10) to provide a compressed make-up syngas (10') that is further supplied to an ammonia synthesis loop (11) forming ammonia (11') and generating a purge gas (11") comprising hydrogen, ammonia, methane and argon; and (iv) introducing the purge gas (11") to a purge gas recovery unit (12), whereby ammonia and hydrogen are recovered and a reject gas (12') is generated, wherein a part of the reject gas (12a) is introduced to a third dryer (13) positioned in series to the second dryer (14) resulting in a dried reject gas (13'), wherein a part of the dried reject gas (13') is supplied to the second dryer (14), located downstream of the third dryer (13), thereby regenerating the second dryer (14) and resulting in a used reject gas (14'). The disclosure further provides a plant for producing ammonia, the use of a reject gas emerging from the purge gas recovery unit in the ammonia plant to perform the process of the disclosure and a method of revamping the ammonia plant.

The present disclosure provides a method for operating a urea plant comprising an urea synthesis section, wherein the synthesis section comprises at least one high-pressure process line, a flushing system fluidly connected to the at least one high-pressure process line, a first high pressure flushing pump configured to direct an aqueous solution to the flushing system, and at least one sensor for measuring a process variable, wherein the urea plant comprises a second high-pressure flushing pump configured to direct an aqueous solution to the at least one sensor for measuring a process variable, and wherein the method further comprises continuously directing an aqueous solution from the second high-pressure flushing pump to the flushing system. The present disclosure further provides an assembly comprising a flushing system, a first high pressure flushing pump fluidly connected to the flushing system, a second high-pressure flushing pump and at least one sensor for measuring a process variable in the synthesis section, wherein the second high-pressure flushing pump is fluidly connected to the flushing system and to the at least one sensor and configured to provide an aqueous solution to the flushing system and to the at least one sensor.

A computer-implemented method for asset identification and modeling, the method comprising: - receiving asset information data and asset operating data; - defining operating states of the asset and identifying faulty periods of the asset based on the received asset information and asset operating data; - selecting non-anomalous operating data of the asset; - training at least one model configured to detect asset anomalies based on the selected non-anomalous operating data; - validating the at least one model; - determining an asset anomaly based on the asset current operating data and on at least one of the validated at least one models.

The present disclosure relates to a process for production of nitric acid and a nitric acid production plant, particularly wherein a tail gas recycle stream is supplied to the converter. More in particular, in the process and plant of the present disclosure, at least part of the tail gas is treated in a tail gas treatment section and further heated in a heating section, thereby obtaining a heated tail gas stream, typically having the temperature in the range of 400-600°C. The temperature of this heated tail gas stream is reduced by mixing with a tail gas bypass stream bypassing the tail gas treatment section and/or heating section, resulting in the tail gas recycle stream that can be recirculated to the converter and having the correct temperature for the converter, typically having a temperature in the range of 150-300°C. The disclosure further provides the use of the nitric acid production plant for performing the method according to present disclosure and the method of revamping a nitric acid production plant.

The present disclosure provides a method for measuring the biuret content of an aqueous solution comprising urea, one or more ammonium salts, free ammonia, and biuret, the method comprises: passing a first aqueous solution comprising urea, one or more ammonium salts, free ammonia, and biuret, through an ion exchange column comprising acid groups with a pKa ranging from 3.0 to 5.0, thereby obtaining a second aqueous solution comprising urea, one or more ammonium salts, and biuret and depleted in ammonia; analyzing the second aqueous solution in a system comprising a high-performance liquid chromatography device, thereby measuring the biuret content of the second aqueous solution; and processing the biuret content of the second aqueous solution, thereby obtaining the biuret content of the first aqueous solution.

The present disclosure relates to a gas handling equipment of a chemical production plant, comprising a bottom with a lowest part, and being configured to receive a gas which comprises solid particles, wherein, during operation, the solid particles at least partially are carried over from the gas phase to a condensate phase, and comprising a drain arrangement located in the lowest part of the bottom of the gas handling equipment, which comprises a drain nozzle comprising an drain opening, and a drain pipe which is in liquid communication with the drain nozzle, the drain opening being configured to drain the condensate out of the gas handling equipment towards the drain pipe, and wherein one or more floating ball liquid traps are installed downstream the one or more drain arrangements, each floating ball trap being configured to evacuate the condensate out of one or more of the drain pipes when condensate is present in the drain pipe of the respective drain arrangement(s). The present disclosure further relates to a nitric acid production plant comprising an ammonia oxidizer, an absorption tower, and gas handling equipment. The present disclosure finally relates to a method for handling a gas in a gas handling equipment of a chemical production plant.

The present disclosure relates to a heat exchange arrangement comprising one or more shell and tube heat exchangers having a shell with an inner space, the heat exchanger having a tube-side inlet which enters a tube-side fluid to be heated or cooled in a front head located in between the tube-side inlet and a front tube sheet, from which the tube-side fluid then is distributed to a plurality of tubes which are held in place by tube sheets, and through which the tube-side fluid moves and during the movement is cooled or heated by a first shell-side heating or cooling fluid which moves through a first compartment with a first compartment inlet and a first compartment outlet, and by a second shell-side heating or cooling fluid which moves through a second compartment with a second compartment inlet and a second compartment outlet, whereafter the cooled or heated tube-side fluid is collected in a rear head located between a rear tube sheet and a tube-side outlet through which the cooled process gas leaves the heat exchanger, the tubes further being supported by a first and a second intermediate tube sheet placed between the front tube sheet and the rear tube sheet and between which a buffer compartment is formed with a buffer fluid with a buffer fluid temperature, the buffer fluid not chemically reacting producing insoluble compounds that precipitate as scale and not comprising compounds that chemically react with the shell resulting in corrosion at the buffer fluid temperature, and having a pressure which is higher than the higher one of the pressure of the first shell-side fluid in the first compartment and the second shell-side fluid in the second compartment.

The present disclosure relates to a method and a system to increase the dissolved oxygen content in a water body having a dissolved oxygen content of between 0 mg/l and 4 mg/l, or to anticipate a future drop of a dissolved oxygen content of a water body to between 0 mg/l and 4 mg/l, wherein the water body is non-stratified, or is stratified and comprises at least an epilimnion, wherein the method comprises a step a, wherein a stream of diluted aqueous nitrate containing liquid droplets of which at least part are diluted oxygenated aqueous nitrate containing liquid droplets are formed, and a subsequent step b, wherein the diluted aqueous nitrate containing liquid droplets of which at least part are oxygenated diluted aqueous nitrate containing liquid droplets are further spread, in case of a non-stratified water body, in a part of the water body or in the whole water body, and in case of a stratified water body, in a part of the epilimnion of the water body or in the whole epilimnion of the water body.

The present disclosure relates to a horizontally oriented gas handling equipment of a chemical production plant, comprising a bottom with a lowest part, and being configured to receive a gas which comprises solid particles, wherein, during operation, the solid particles at least partially are carried over from the gas phase to a condensate phase, and comprising a drain arrangement located in the lowest part of the bottom of the gas handling equipment, which comprises a drain nozzle comprising an drain opening, and a drain pipe which is in liquid communication with the drain nozzle, the drain opening being configured to drain the condensate out of the gas handling equipment towards the drain pipe, and wherein a collar which at least partially surrounds the drain opening and comprises one or more collar drain openings which are located in a side of the collar opposite to the flow direction of the incoming gas in the gas handling equipment, at least part of the solid particles of the condensate being stopped by the collar, thereby obtaining a remaining part of the condensate with a reduced amount of solid particles which will flow towards the one or more collar drain openings, and subsequently in the nozzle opening and finally in the drain pipe. The present disclosure further relates to a nitric acid production plant comprising an ammonia oxidizer, an absorption tower, and horizontally oriented gas handling equipment. The present disclosure finally relates to a method for handling a gas with solid particles in a horizontally oriented gas handling equipment of a chemical production plant.

A burner basket assembly of an ammonia oxidation reactor, wherein the burner basket assembly comprises a burner basket inner side wall, a gas-permeable bottom plate, wherein between the burner basket inner side wall and the bottom plate a circumferential radial clearance is present, an L-shaped clearance cover profile which comprises a horizontal and a vertical clearance cover plate, wherein the horizontal and the vertical clearance cover plate are mechanically fixed to each other, wherein the vertical clearance cover plate comprises a window opening, and wherein the L-shaped cover profile during operation is displaceable in a vertical direction in view of the burner basket inner side wall, and at least one key-lock system which comprises a lock which is connected to the burner basket inner side wall, which extends through the window opening in the vertical clearance cover plate, and which comprises at least one lock opening, and a key which has at least a vertical pin with a certain pin length, wherein the lock opening is configured to allow insertion of the pin in the lock opening, and at the same time is configured to limit movement of the pin in view of the lock opening to such an extent that radial movement of the vertical clearance plate in view of the burner basket inner side wall is restricted.

The present disclosure provides a pressure control valve (1), in particular for use in a urea-producing plant. The present disclosure also provides a urea-producing plant comprising one or more pressure control valves (1), and the use of a pressure control valve (1) in a urea-producing plant. The pressure control valve (1) comprises a first body part (2) and a second body part (3) fluidically connected to each other through a valve seat (8), wherein the first body part (2) comprises an inlet (4) and a flow-regulating component, the movement of which regulates the volume flow rate of fluid flowing from the first body part (2) to the second body part (3); the second body part (3) comprises an outlet (5); the first body part (2) and the second body part (3) are made from the same first material; wherein the valve seat (8) has a cylindrical shape and circular walls and comprises an inner region (10) and an outer region (9), and wherein the outer region (9) is made from a second material, the inner region (10) is made from a third material, and the second material has a lower hardness than the third material.

The present disclosure relates to a computer-implemented method for anomaly ranking of an industrial asset, wherein the method comprises receiving operational data from a plurality of sensors coupled to an industrial asset; processing the operational data to determine a deviation amount, wherein determining a deviation amount comprises determining a difference between a sensor output value and a sensor limit threshold value; defining at least two anomaly events for the at least one sensor comprising a sensor output value outside a predetermined sensor limit threshold value and ranking the at least two anomaly events, wherein ranking an anomaly event comprises: processing the operational data to determine a deviation duration, wherein determining a deviation duration comprises determining the time when the plurality of sensor output values lie outside the sensor limit threshold value; determining a severity factor for each anomaly event based on the deviation amount and deviation duration; determining a priority factor of each anomaly based on the severity factor; outputting the at least two ranked anomaly events on a user terminal based on the priority factor.

The present invention relates to a computer-implemented method and system for determining an agricultural product related gas emission in a geographical area, wherein the method comprises determining a geographical area, receiving soil and weather data for the determined geographical area, receiving agricultural product data, wherein receiving agricultural product data comprises receiving an agricultural product composition and an agricultural product amount, wherein determining an emission amount further comprises, generating a grid with a plurality of grid cells over the determined area, and determining for a plurality of grid cells: a soil profile, a volumetric soil water content, a water filled pore space value based on the volumetric soil water content and the soil profile, an emission factor based on the water filled pore space, an agricultural product amount, an emission amount of an agricultural product related gas based on the emission factor and the agricultural product distribution, and the method further comprising generating an emission amount of the agricultural product related gas for the determined area based on the determined emission amount for at least a portion of the grid cells.

System for detecting overflow of a fluid in a storage tank (15) comprising an an inlet pipe (14) configured to receive the fluid from a delivery station (11) and in communication with the storage tank (15); an outlet pipe (16) in communication with the storage tank (15) and configured to release vapours and excess fluid rising from the storage tank; and an electric level switch (17) mounted on the outlet pipe (16) and connected to a line (18A), the line (18A) configured to receive vapours and the excess fluid from the outlet pipe and particularly configured for transferring the vapours and excess fluid to a scrubbing reservoir (19A). The electric level switch (17) comprises a central body (34) including a plurality of sensors (34a, 34b) disposed at its centre and is adapted to receive or detect the excess fluid rising in the outlet pipe. The present disclosure further provides a method for detecting overflow of a fluid in a storage tank and the use of the system to perform the method of present disclosure.

The present disclosure provides a virtual sensing method for controlling at least one composition variable during a urea production process in a urea-producing plant, based on a plurality of online measured process variables and the viscosity of one or more liquid streams.

The present disclosure discloses a catalytic system comprising a Pd-containing catalyst, and a recovery system downstream of the catalyst, wherein the recovery system comprises one or more oxide of a rare earth metal selected from the group consisting of Sm₂O₃ and Gd₂O₃. The present disclosure further relates to the use of one or more oxides of a rare earth metal selected from the group consisting of Sm₂O₃, and Gd₂O₃ for recovering volatile Pd and to a method for recovering volatile Pd.

The present invention relates to a computer-implemented method and system for determining a soil property indicator score, wherein the method comprises selecting at least one soil property; receiving soil property data for a plurality of locations within a region; determining an inherent site-specific factor; receiving geospatial data for the plurality of locations; and assigning a geospatial class to at least a part of the plurality of locations, based on the inherent site-specific factor and on the received soil property data; identifying land parcels within the region, each land parcel including two or more locations with the same geospatial class; receiving predetermined value data for said soil property for a specific location within the region; determining the geospatial class of the land parcel comprising the specific location; identifying a subset of land parcels, each land parcel in the subset having the same geospatial class as the land parcel comprising the specific location; determining a scoring function for said soil property based on the received geospatial data of the subset of land parcels; and determining the soil property indicator score of the specific location based on the determined scoring function. Further embodiments relate to the generation of a soil health index and the generation of a recommendation and/or implementation of an agricultural practice.

The present disclosure provides a method for producing potassium sulfate, the method comprising subjecting potassium chloride to an electrolysis reaction, thereby producing potassium hydroxide and hydrogen gas and chlorine gas, reacting the potassium hydroxide produced by electrolysis with carbon dioxide, thereby producing potassium carbonate, and reacting the potassium carbonate with sulfuric acid, thereby producing potassium sulfate and carbon dioxide. The present disclosure also provides a system for performing the method.

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