WO2023175107A1 - Procédé et système de séchage de sels, en particulier des sels hydratés - Google Patents

Procédé et système de séchage de sels, en particulier des sels hydratés Download PDF

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Publication number
WO2023175107A1
WO2023175107A1 PCT/EP2023/056809 EP2023056809W WO2023175107A1 WO 2023175107 A1 WO2023175107 A1 WO 2023175107A1 EP 2023056809 W EP2023056809 W EP 2023056809W WO 2023175107 A1 WO2023175107 A1 WO 2023175107A1
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Prior art keywords
gas
moist
drying
salt
dryer
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Application number
PCT/EP2023/056809
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English (en)
Inventor
Zahé DAW
Søren FJORDGAARD
Peter Schultz Nielsen
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Gea Process Engineering A/S
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Filing date
Publication date
Priority claimed from AU2022268395A external-priority patent/AU2022268395B2/en
Application filed by Gea Process Engineering A/S filed Critical Gea Process Engineering A/S
Publication of WO2023175107A1 publication Critical patent/WO2023175107A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/022—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure with provisions for changing the drying gas flow pattern, e.g. by reversing gas flow, by moving the materials or objects through subsequent compartments, at least two of which have a different direction of gas flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F26B21/083—Humidity by using sorbent or hygroscopic materials, e.g. chemical substances, molecular sieves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/005—Treatment of dryer exhaust gases
    • F26B25/007—Dust filtering; Exhaust dust filters

Definitions

  • the present invention relates to a method and system for drying salts and in particular hydrated salts in which the amount of wastewater is reduced by the introduction of a dehumidifying system.
  • inorganic and organic hydrates An organic hydrate is created when a water molecule is added to a carbonyl group of an aldehyde or ketone. In organic hydrates, the water molecules have chemically reacted with the compound and bonded to it and are thus less vulnerable to becoming anhydrous. The water molecules in inorganic hydrates are only loosely bonded to the compound, and there is no chemical reaction involved. The water molecule(s) can be removed from the compound relatively easy, such as through heating. An inorganic hydrate that has lost its water molecules is known as "anhydrous.” Inorganic hydrates are the most common type of hydrates. Drying inorganic salt hydrates such that the crystal water is not removed is a challenge.
  • DE 197 19 483 relates to methods for drying of materials with least possible energy requirement, the materials to be dried are not further described.
  • Methods for specifically drying salt hydrates are described in the prior art such as US 10,215,492 and US 10,914,519 where wet material, of particularly iron sulphate heptahydrate, is dried in a fluid bed dryer.
  • the wet gas leaving the dryer is fully recirculated to the dryer where the wet gas is dried through a condensing step, where the moisture content of the drying gas is set using the temperature of the condenser, and, when operating in a closed cycle system, water is selectively removed from the system using a surface or wash condenser.
  • the water evaporated from the product corresponds to the condensed water which is removed from the process.
  • drying is a process that consumes large amounts of resources both in terms of wastewater generation from the drying process, and resources in the form of supplying energy for heating and cooling.
  • a method for drying a moist salt comprising the steps of: i) feeding a moist salt, and optionally semi dried salt from a filter, to a dryer, such as a fluid bed dryer; ii) drying the moist salt, and optionally the semi dried salt, with a drying gas having a predefined moisture content thereby providing a dried salt and a moist exhaust gas; iii) feeding the moist exhaust gas, in which moist reduced salt may be entrained, to an optional filter to provide a moist gas and optionally the semi dried salt; iv) feeding a portion of the moist gas from the optional filter to a dehumidifying section, in said dehumidifying section, the portion of the moist gas subjected to the steps of a.
  • a filter capable of removing particles in the moist gas preferably a mechanical air filter, such as a high efficiency particulate air filter (HEPA filter); b. optionally feeding the portion of the moist gas to a pre-treat- ment air cooler or condenser to provide a water reduced gas slipstream and water; c.
  • a filter capable of removing particles in the moist gas preferably a mechanical air filter, such as a high efficiency particulate air filter (HEPA filter)
  • HEPA filter high efficiency particulate air filter
  • the salts are hydrated salts. Most preferred salts are metal salts, and even more preferred hydrated lithium salts such as lithium hydroxide monohydrate.
  • step iv) b. of feeding the portion of the moist gas to a pre-treatment air cooler or condenser to provide a water reduced gas slipstream and water is mandatory.
  • water is produced which may be reused, furthermore in embodiments where the pre-treatment is cooling, the thus water reduced slip stream is conditioned for optimal removal of water in the adsorption dehumidifier, which is more efficient at lower temperatures.
  • the adsorption dehumidifier is suitably a desiccant, for example using montmorillonite clay, calcium oxide, calcium sulfate, activated carbon, superabsorbent polymers, silica gel, zeolites, molecular sieves or activated alumina.
  • the adsorption dehumidifier suitably operates at temperatures around 15 - 30 °C, typically around 22 - 27 °C depending on the cooling water.
  • the moisture content of the drying gas is adjusted to be in accordance with the predefined range such that when the humidity of the mixed airflow is higher than the predefined moisture content, the flowrate of the moist gas is decreased, and when the humidity of the mixed airflow is lower than the predefined moisture content, the flowrate of the moist gas is increased.
  • the predefined moisture content range depends on the specific salt to be dried and the skilled person will know how to find specific values. As such in a presently preferred embodiment when the salt is a hydrated lithium salt, the predefined moisture content is in the range of 40 to 60 g water/kg dry gas.
  • the dryer operates at a predefined pressure range.
  • a dryer air pressure sensor is attached outside the dryer, an exhaust gas fan is located on a discharge side of the filter and a bleed valve is positioned on an exit side of the exhaust gas fan.
  • the sensor senses the air pressure within the dryer and if it is outside of the predefined pressure range, a signal is sent to the exhaust gas fan to change the speed thereof, thereby increasing or decreasing the removal rate of the moist gas from the dryer in order to return the air pressure within the dryer to the predetermined pressure range.
  • the pressure is regulated by regulating the bleed valve.
  • the predefined pressure is in the range of -5 mbar (i.e. , a slight under pressure) to 50 mbar, preferably a slight overpressure, more preferred 5 mbar to 30 mbar and even more preferred 10 to 20 mbar.
  • the moisture content of the drying gas is controlled by splitting the moist exhaust gas and treating a portion of the moist gas in the dehumidifying section.
  • the portion of the moist gas fed to the dehumidifying system is in the range of 10 to 40 %. This range has proven to provide an optimal effect on the overall process in simulation, balancing drying efficiency, i.e. taking out enough moisture from the mixed airflow, and energy costs for driving the dehumidifying section.
  • the flowrate of feeding the regeneration air to the adsorption dehumidifier is adjusted, such that the second predefined moisture content lies within a predefined range. It is presently preferred that the range is 5 - 15 g/kg, more preferably 10 g/kg.
  • the second predefined moisture content may be expressed as a ratio of the moisture content of the moist gas, and a presently preferred value is around 1/6 of the moisture content of the moist gas.
  • the method of the invention can be used for reducing wastewater of such a process, hence in a particular embodiment the method of the invention is a method for reducing wastewater and in another aspect the invention provides the use of a method as detailed for reduction of wastewater. Since the water generated in the process is pure high- quality water it can readily be reused for other purposes or upstream in a crystallization process.
  • a system for drying a moist salt into a dried, preferably hydrated salt comprising a drying section and a dehumidifying section; in which the drying section comprises at least a dryer, a filter, and at least one humidity controller, said dryer having a feed material inlet, a product outlet, a drying gas inlet and an exhaust gas outlet and said filter having at least an exhaust gas inlet, a moist gas outlet and a semi dried salt outlet; wherein the dehumidifying section has an inlet and an outlet and wherein the dehumidifying section comprises a filter capable of removing particles, a adsorption dehumidifier, a dehumidifier regeneration system and a humidity controller, and wherein the outlet of the dehumidifying section is connected to the drying gas inlet of the dryer of the drying section, preferably via a heating unit.
  • the dehumidifying section further comprises a pre-treatment cooler or condenser, where the inlet of the pre-treatment cooler or condenser is connected to the outlet of the filter capable of removing particles and the inlet of the adsorption dehumidifier and further wherein the pre-treatment air cooler or condenser has a water outlet.
  • the pre-treatment cooler or condenser is an air cooler.
  • the invention also relates to a dehumidifying section as a stand-alone unit that may be retrofitted to an existing drying plant.
  • Fig. 1 shows an overview of an embodiment of a system according to the invention.
  • Fig. 2 shows an overview of another embodiment of a system according to the invention.
  • Fig. 3 is an expanded view of a dehumidifying system according to the invention.
  • Fig. 4 is a view corresponding to Fig. 2, of an embodiment of an alternative aspect of a method and system according to the invention.
  • salts to be dried include both organic and inorganic salts, preferred are hydrated organic and inorganic salts.
  • Preferred hydrated salts according to the invention are metal salts and more preferred are hydrated inorganic salts.
  • Examples of such hydrate salts according to the invention include: CuSO4-5H2O, Copper(ll)sulfate pentahydrate, CoCl2*6H2O, Cobalt(ll) chloride hexahydrate; BeSO FhO, Beryllium sulfate tetrahydrate; K 2 CO 3 -1.5H 2 O, potassium carbonate sesquihydrate; CaSO4-0.5H2O, Calcium sulfate hemihydrate; Epsom Salts: Magnesium sulfate heptahydrate, MgSO4-7H2O; Washing Soda: Sodium carbonate decahydrate, Na2CO3-10H2O; Borax: Sodium tetraborate decahydrate, Na2B40y10H20; Lithium hydrox
  • the dryer can be but is not limited to fluid bed dryers (with or without built-in heat exchanger), rotary dryers (drum dryers), flash dryers, or fluidized bed spray granulators.
  • Preferred is a fluid bed dryer.
  • the method and system according to the invention preferably constitute a substantially closed system.
  • a closed system is meant a system where the process streams are confined in the process.
  • the system is open to the surroundings via the feed of starting material and withdrawal of final product.
  • condensed water and steam leaves the system in the dehumidifying system.
  • a hydrate salt is to be understood as a salt where the water of crystallization or crystal water is still part of the salt crystal.
  • any reference to hydrate, salt with crystal water, salt containing water of crystallization have the same meaning.
  • Carbon dioxide and oxygen in the drying gas are undesired for many salts as they can react and produce undesired by-products, therefore these gases, and in particular carbon dioxide, are preferably removed from the system and drying gas. Carbon dioxide gas can react with lithium hydroxide to produce lithium carbonate, which is an undesired by-product.
  • the system comprises a drying section 1 and a dehumidifying section 2.
  • the sections are connected such that a feed line for a portion of moist gas g9 is an inlet from the drying section 1 to the dehumidifying section 2, and a feed line for a dehumidified gas slip stream, g11 , is an outlet from the dehumidifying section into the drying section.
  • the system is closed and is only open to the surroundings in the following manner.
  • the drying section 1 also has a feed line for moist salt, f1 , and an outlet for dried salt, f2.
  • the dehumidifying section 2 has a feed inlet for regeneration air, g12, and an outlet for moist regeneration air, g13, and a water outlet, 114. If need be and as illustrated, a bleed off valve 16 and a purge valve 17 may be present in the system to accommodate flows which also lead away from and to the system, respectively. This is to regulate pressure if needed.
  • a flow of semi dried salt f3 that has been entrained in moist exhaust gas g7 may be fed to a top of the dryer 11 from a filter 12, in which the moist salts may be treated and/or mixed with a dried product.
  • the semi dried salt from the filter may also be fed to a top end of a mixer (not shown) and mixed with the moist salts and fed to the dryer.
  • g5 which has an initial moisture load, i.e., humidity, circulates around the moist salts and evaporates surface water and/or water of crystallization to provide the final product f2.
  • the surface water evaporates while keeping the water of crystallization intact, i.e. in case of hydrates.
  • the moist exhaust gas g7 contains the moisture from the initial drying gas g5, g6 and moisture which has been evaporated from the moist salts in the dryer 11 .
  • the moisture of the initial drying gas g5, g6 is moisture built up from drying the moist salts in the dryer 11 .
  • a moist gas will have to be provided from an external source, but once the method and system is in operation, the moisture comes from the process itself, i.e. from evaporating moist from the feed f1 .
  • a dryer air pressure sensor 10 is attached outside the dryer 11 .
  • the sensor 10 senses that the air pressure within the dryer 11 is outside of a predetermined pressure range, a signal is sent to change the speed of an exhaust gas fan 16a located for example on a discharge side of the filter 12 thereby increasing or decreasing the removal rate of the moist exhaust gas g7 from the dryer 11 in order to return the air pressure within the dryer to the predetermined pressure range.
  • the bleed valve 16 is positioned in the moist exhaust gas flow g7 on an exit side of the exhaust gas fan 16a to allow the release of some of the moist exhaust gas as required depending on the predetermined pressure.
  • the predetermined pressure in the dryer is at a slight overpressure, such as - 5 mbar to 50 mbar, preferably a slight overpressure, more preferred 5 mbar to 30 mbar and even more preferred 10 to 20 mbar.
  • the remaining moist gas g8 i.e. , the portion of the exhaust gas which is not bled off from the bleed valve 16, circulates within the drying method and system.
  • a purge gas g15 without carbon dioxide (and/or oxygen) is added to the system.
  • a purge gas may be added at any position of the system or method. In the embodiment shown it is positioned immediately upstream from the bleeding off of the moist gas g8 and fed to the filter 12.
  • the purge gas could in principle comprise any gas that has been treated so as not to contain carbon dioxide, oxygen, or other constituents.
  • a portion of the circulating moist gas, g9 is directed to the dehumidifying system 2.
  • the portion g9 is fed through a filter capable of removing particles from a gas stream, here illustrated as a HEPA filter 21 .
  • the filtering is followed by an optional dehumidifier element 22, which may be a condenser or an air cooler or other means of taking out water.
  • the dehumidifier element 22 is present in the form of an air cooler, which is a preferred element, because it conditions the gas for an efficient water adsorption in the next step.
  • a water reduced gas slipstream g10 passes directly through an adsorption dehumidifier 23 to remove remaining water and to provide the dehumidified gas slip stream g11 , and then feed the dehumidified gas slip stream g11 back to the drying section 2 to mix with the moist gas g8 to provide a mixed airflow g4.
  • a first humidity controller 24 is positioned in a return flow path of the dehumidified gas slip stream g11 , and the first humidity controller 24 detects whether the humidity of the dehumidified gas slip stream g11 is according to a predefined moisture content before the dehumidified gas slip stream is mixed with the moist gas g8 and to provide the mixed air flow g4.
  • humidity controller is meant a unit capable of sensing, monitoring and adjusting a humidity level in a given setting.
  • the humidity controller may further comprise control units and transitory memories for storing values and instructions and is capable to communicate with other units to carry out means for assisting in adjustment of the humidity level.
  • a signal is sent to the adsorption dehumidifier 23, and a controller 25 for a heater 26 of regeneration air g12 ensures adjustment of the regeneration air g12 fed to the adsorption dehumidifier 23 to change the output and thereby adjust the humidity level in the moist regeneration air g13 leaving the adsorption dehumidifier 23.
  • the adsorption dehumidifier 23 is regenerated by supplying hot air to the adsorption dehumidifier.
  • the dehumidified gas slip stream g11 from the adsorption dehumidifier 23 leaves the dehumidifying system 2 and is mixed with the moist gas g8 to form the mixed air flow g4.
  • the mixed air flow g4 is fed to heating unit of the drying section 1 to provide the drying gas to the dryer 11 as will be described in more detail below.
  • a second humidity controller 15 is positioned to measure the humidity in the mixed air flow g4 and, if the humidity is outside of the predefined moisture content of the drying gas g5, g6, the second humidity controller 15 sends a signal to a valve 15a located on the moist gas g8 flow path.
  • the valve 15a may be positioned at any location but is suitably positioned immediately after directing a portion of the moist gas g9 to the dehumidifying system 2 for ease of operation.
  • the valve controls the flowrate of the moist gas g8 flow rate.
  • the mixed air flow g4 is fed to a heating unit comprising one or more heaters, here first and second heaters 13, 14, to provide the drying gas g5, g6 to the dryer 11.
  • a heating unit comprising one or more heaters, here first and second heaters 13, 14, to provide the drying gas g5, g6 to the dryer 11.
  • the mixed air flow g4 is passed through an inlet drying gas fan 18, the flow is split into a first inlet drying gas portion g5 that passes through the first heater 13 and then into an air inlet (not shown in detail) of the dryer 11 , and a slipstream inlet drying gas portion g6 that may bypass the second heater (not shown) 14 can be separately added directly to the dryer 11 in controlled amounts.
  • the first inlet drying gas portion g5 After leaving the heater 13 the first inlet drying gas portion g5 passes an inlet drying gas flow controller 13a, which measures the flow rate of the first inlet drying gas portion g5. If the flow rate of the first inlet drying gas portion g5 is measured by the inlet gas flow controller 13a to be outside of a predetermined flow rate range, the inlet gas flow controller 13a sends a control signal to the inlet drying gas fan 18 to either speed up or slow down to return the flow rate of the first inlet drying gas portion g5 to the predetermined flow rate range.
  • the slipstream inlet drying gas portion g6 passes through a slipstream inlet drying gas portion flow control valve 14b and a slipstream inlet drying gas portion flow controller 14a, which measures the flow rate of the slipstream inlet drying gas portion g6. If the flow rate of the slipstream inlet drying gas portion g6 is measured to be outside of a predetermined flow rate range, the slipstream inlet drying gas portion flow controller 14a sends a control signal to the slipstream inlet drying gas portion control valve 14b to either increase or decrease the flow rate of the slipstream inlet drying gas portion g6 to the predetermined flow rate range.
  • the dehumidifying section 2 of the system shown in figure 2 and shown as an expanded view in figure 3 may be a standalone unit that can be retrofitted to existing drying plants in order to improve energy consumption and improve the wastewater.
  • Case 1 and 2 had the same initial moisture content of the moist salt but different flow rates whereas run 3 had a lower moisture content but similar flow rate as case 1 .
  • the end product which in the example is LiOH-hydrate had a moisture content of 0.1 %.
  • the portion of the moist gas fed to the dehumidifier system, 2 was 4115/13959, i.e. around 30%.
  • the portion was around 15% and in case 3 around 23%.
  • the pressure of the system was in the cases in the range of 10-20 mbar.
  • the drying gas temperature was around 120 to 130 °C, and the product feed temperatures around 70 to 90 °C and the product temperature around 50 - 60 °C.
  • Example 2 energy consumption The energy consumption was calculated for the embodiment of case
  • a method and a system for drying a moist salt comprises the steps of i) feeding a moist salt, and optionally semi dried salt from a separation device, to a dryer, such as a fluid bed dryer; ii) drying the moist salt, and optionally semi dried salt, with a drying gas having a predefined moisture content thereby providing a dried salt and a moist exhaust gas; iii) feeding the moist exhaust gas, in which moist reduced salt may be entrained, to an optional separation device to provide a moist gas and optionally the semi dried salt; iv) feeding a portion of the moist gas from the optional separation device to a dehumidifying section, said dehumidifying section comprises the steps of a.
  • a filter capable of removing particles in the moist gas, preferably a mechanical air filter, such as a high efficiency particulate air filter (HEPA filter); b. optionally feeding the portion of the moist gas from the filter to a pretreatment air cooler or condenser to provide a water reduced gas slipstream and water; c.
  • a filter capable of removing particles in the moist gas, preferably a mechanical air filter, such as a high efficiency particulate air filter (HEPA filter)
  • HEPA filter high efficiency particulate air filter
  • a dehumidified gas slipstream from an external source; v) mixing the dehumidified gas slipstream with the moist gas or optionally water reduced gas slipstream, to provide a mixed airflow, and vi) detecting the humidity of the mixed airflow and wherein if the humidity of the mixed airflow is different from the predefined moisture con-tent of the drying gas of step ii), the flowrate of the moist gas and the portion of the moist gas are adjusted.
  • a first step comprises i) feeding a moist salt f 1 , and optionally semi dried salt f3 from a separation device 12’, to a dryer, such as a fluid bed dryer 11 .
  • the fluid bed dryer may be provided with a distribution device (not shown), such as a conical hat.
  • a second step comprises ii) drying the moist salt with a drying gas g5, g6 having a predefined moisture content thereby providing a dried salt f2 and a moist exhaust gas g7; iii) feeding the moist exhaust gas g7, in which moist reduced salt may be entrained, to an optional separation device 12’ to provide a moist gas g8 and optionally the semi dried salt f3; iv) feeding a portion of the moist gas g9 from the optional separation device 12’ to a dehumidifying section 2, said dehumidifying section 2 comprises the steps of a.
  • a filter capable of removing particles in the moist gas preferably a mechanical air filter 21 , such as a high efficiency particulate air filter (HEPA filter); b. optionally feeding the portion of the moist gas g9 from the filter 21 to a pre-treatment air cooler or condenser 22 to provide a water reduced gas slipstream g10 and water 114; c.
  • a filter capable of removing particles in the moist gas preferably a mechanical air filter 21 , such as a high efficiency particulate air filter (HEPA filter)
  • HEPA filter high efficiency particulate air filter
  • the gas stream g11 ’ from the external source may comprise a stream of treated gas.
  • a treated gas could in principle comprise any gas in which the contents of carbon dioxide, oxygen etc. has been reduced or removed.

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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Abstract

Procédé et système de séchage de sels, en particulier des sels hydratés. La présente invention concerne un procédé et un système de séchage de sels et en particulier des sels hydratés dans lesquels la quantité d'eaux usées est réduite par l'introduction d'un système de déshumidification.
PCT/EP2023/056809 2022-03-16 2023-03-16 Procédé et système de séchage de sels, en particulier des sels hydratés WO2023175107A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DKPA202270108 2022-03-16
DKPA202270108 2022-03-16
EP22162583.3 2022-03-16
EP22162583 2022-03-16
AU2022268395A AU2022268395B2 (en) 2022-03-16 2022-11-11 Method and system for drying salts, in particular hydrated salt
AU2022268395 2022-11-11

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