Device and method for removing carbon dioxide from ambient air

Abstract

A device (100) for removing carbon dioxide from ambient air (102) is proposed. The device (100) comprises at least one reaction vessel (104) for receiving a suspension (106), wherein the suspension (106) comprises rock flour containing calcium oxide and / or magnesium oxide, and water. The device (100) comprises a supply device (110) for supplying ambient air (102) to the reaction vessel (104), wherein the ambient air (102) comprises carbon dioxide, such that the ambient air (102) can be brought into contact with the suspension (106) and the carbon dioxide reacts with the calcium oxide to form calcium carbonate and / or the magnesium oxide to form magnesium carbonate. The device (100) comprises an outlet (120) from the reaction vessel (104) for discharging (120) ambient air (122) depleted of carbon dioxide from the reaction vessel (104).Furthermore, a method for removing carbon dioxide from ambient air (102) is proposed.

Description

Technical area

[0001] The present invention relates to a device and a method for removing carbon dioxide from ambient air. Technical background

[0002] Various approaches for removing carbon dioxide (CO2) are known from the state of the art. For example, processes for separating CO2 from the atmosphere or flue gases using (spray) scrubbers are described in the literature. The scrubbing liquid is, for example, sodium or potassium hydroxide solution, and the CO2 is ultimately bound to calcium carbonate by reaction with calcium oxide.

[0003] WO 2008 / 101293 A1 describes a system, apparatus, and method for sequestering carbon dioxide. The method comprises the following steps. In a first stage, a slurry of a metal silicate rock is mixed with ammonia to produce an ammonia / water / metal silicate slurry. In a second stage, the method comprises scrubbing a carbon dioxide-containing gas stream with the solution from the first stage to thereby absorb the carbon dioxide into a reactive slurry. In a third stage, the reactive slurry from the second stage is passed through a reactor controlled to promote the reaction between the carbon dioxide and the metal silicate to thereby produce a metal carbonate.

[0004] WO 2010 / 088738 A1 describes a system, apparatus, and method for sequestering carbon dioxide. The method comprises a first stage of scrubbing a carbon dioxide-containing gas stream with a solution comprising normal ammonium carbonate capable of absorbing the carbon dioxide, wherein the carbon dioxide reacts with the ammonium carbonate to produce a solution comprising ammonium bicarbonate. In a second stage, a reactive slurry consisting of a metal silicate rock is passed, together with the ammonium bicarbonate solution, through a reactor controlled to promote the reaction between the bicarbonate and the silicate rock to form metal carbonate and silicon dioxide.

[0005] US 2015 / 030523 A1 describes the chemical sequestration of carbon dioxide from industrial emissions by carbonation of an alkaline earth metal-containing material. The carbon dioxide-containing gas is contacted with an aqueous slurry in a carbonation unit to carbonate at least a portion of the alkaline earth metal to produce a carbon dioxide-depleted gas and a carbonate-laden slurry that is substantially free of precipitated alkaline earth metal. The carbonate-laden slurry is then separated into an aqueous phase and a solid phase, and the aqueous phase is fed to a precipitation unit to precipitate alkaline earth metal carbonates. The carbonation step can be carried out at a carbonation temperature between about 10°C and about 40°C and a carbonation pressure between about 1 bar and about 20 bar. The solid phase can be recycled to the carbonation step.

[0006] “Modelling a basalt reactor for direct air CO2 capture”, Environmental Earth Sciences (2022) 81:194, describes studies on the reaction kinetics of basalt rock applied to fields with a weathering period of 9 to 33 years.

[0007] “A novel high pressure column flow reactor for experimental studies of CO2 mineral storage”, Applied Geochemistry 30 (2013) 91-104 and “Experimental studies of basalt-H2O-CO2 interaction with a high pressure column flow reactor: the mobility of metals”, Energy Procedia 37 (2013) 5823 - 5833 describe the experimental simulation of the reaction of CO2-rich water with basalt rock under high pressure and thus with the processes that are to be expected when injecting “pure” CO2 into deep rock layers.

[0008] Despite the numerous advantages of state-of-the-art processes for the (temporary) removal of carbon dioxide from gases, they still have potential for improvement. These processes ultimately use pure chemicals that were previously produced with high (energy) expenditures. Similar solutions are based on caustic soda, potassium hydroxide, and pure calcium oxide. These must first be produced at great expense. The substances are therefore regenerated, ultimately yielding only concentrated CO2, which is to be permanently removed from the atmosphere, for example, by being compressed into deep rock layers. The direct use of basalt rock is only known for its application as a powder on agricultural land and not in an instrumental application. The proposal to apply basalt powder to agricultural land leads to uncontrollable results and can even be counterproductive. Object of the invention

[0009] It would therefore be desirable to provide a device and a method for removing carbon dioxide from ambient air that at least largely avoids the disadvantages of known devices and methods. In particular, the capture and mineralization of CO2 from the atmosphere, flue gases, or other sources should be realized in a simple and cost-effective manner. General description of the invention

[0010] This object is addressed by a device and a method for removing carbon dioxide from ambient air having the features of the independent patent claims. Advantageous further developments, which can be implemented individually or in any combination, are presented in the dependent claims.

[0011] In the following, the terms "have", "have", "comprise" or "include" or any grammatical variations thereof are used in a non-exclusive manner. Accordingly, these terms can refer both to situations in which, apart from the features introduced by these terms, no further features are present, or to situations in which one or more further features are present. For example, the expression "A has B", "A has B", "A comprises B" or "A includes B" can refer both to the situation in which, apart from B, no further element is present in A (i.e., a situation in which A consists exclusively of B), and to the situation in which, in addition to B, one or more further elements are present in A, for example element C, elements C and D, or even further elements.

[0012] Furthermore, it should be noted that the terms "at least one" and "one or more," as well as grammatical variations of these terms, when used in connection with one or more elements or features and intended to express that the element or feature may be provided singly or multiple times, are generally used only once, for example, when the feature or element is first introduced. When the feature or element is subsequently mentioned again, the corresponding term "at least one" or "one or more" is generally no longer used, without limiting the possibility that the feature or element may be provided singly or multiple times.

[0013] Furthermore, the terms “preferably”, “in particular”, “for example” or similar terms are used hereinafter in connection with optional features, without limiting alternative embodiments. Thus, features introduced by these terms are optional features, and these features are not intended to limit the scope of the claims and in particular the independent claims. Thus, as those skilled in the art will recognize, the invention can also be carried out using other embodiments. Similarly, features introduced by “in one embodiment of the invention” or by “in an embodiment of the invention” are understood to be optional features, without limiting alternative embodiments or the scope of the independent claims.Furthermore, these introductory expressions are intended to leave untouched all possibilities of combining the features introduced thereby with other features, whether optional or non-optional.

[0014] In a first aspect of the present invention, a device for removing carbon dioxide from ambient air is proposed. The device comprises at least one reaction vessel for receiving a suspension. The suspension comprises rock flour containing calcium oxide and / or magnesium oxide and water. Such a reaction vessel is designed to be permanently or temporarily filled with a suspension. Filling can be done in larger quantities or by sprinkling. By providing a reaction vessel, the desired reaction can be carried out in a controlled manner.

[0015] The device further comprises a supply device for supplying ambient air to the reaction vessel, wherein the ambient air contains carbon dioxide, such that the ambient air can be brought into contact with the suspension and the carbon dioxide reacts with the calcium oxide to form calcium carbonate and / or the magnesium oxide to form magnesium carbonate. The supply of ambient air can thus be targeted and controlled, so that it is brought into contact with the suspension. Carbon dioxide can then react with calcium oxide to form calcium carbonate and / or with magnesium oxide to form magnesium carbonate.

[0016] The device further comprises an outlet from the reaction vessel for discharging carbon dioxide-depleted ambient air from the reaction vessel. Accordingly, the carbon dioxide can be mineralized and separated, so that the ambient air leaves the reaction vessel with a lower carbon dioxide concentration.

[0017] The invention thus achieves this objective in particular by scrubbing air or exhaust gases drawn in from the atmosphere using a suspension of rock flour in water. Carbon dioxide reacts with the calcium oxide to form calcium carbonate and / or with the magnesium oxide to form magnesium carbonate, and the carbonate(s) precipitate. The air or exhaust gas then leaves the reaction vessel with a reduced carbon dioxide concentration. To improve efficiency, several reaction vessels can also be connected in series. The gas stream then leaves the last reaction vessel with a lower carbon dioxide (CO2) concentration than the first reaction vessel, for example, back into the environment or atmosphere.

[0018] The reaction vessel may comprise at least one wash bottle. The wash bottle may be designed to hold the suspension. The supply device may be designed to pass the ambient air through the wash bottle. Such a wash bottle is commercially available and comparatively inexpensive.

[0019] The supply device may include a compressor. This allows ambient air to be brought into contact with the suspension at a predetermined pressure above atmospheric pressure, thus increasing mass transfer.

[0020] The compressor can be positioned upstream of the wash bottle, allowing ambient air to be forced into the suspension.

[0021] As an alternative to a wash bottle, the device can further comprise a storage container for storing the suspension, a conveying device for conveying the suspension to the reaction container, wherein the reaction container has internals, a distribution device for distributing the suspension to the internals in the reaction container, and a return line for returning the suspension from the reaction container to the storage container. Thus, the suspension can be conveyed from a storage container to a distributor, from where the suspension flows via internals to a collector and back into the storage container. Ambient air is conveyed through the internals and leaves the reaction container into the atmosphere with a reduced CO2 concentration.

[0022] The internals may include packing elements. In these elements, intensive contact occurs between the gas phase and the liquid suspension over a large surface area. This causes CO2 to dissolve from the gas and react to form CaCO3 and / or MgCO3.

[0023] The packing elements can comprise structured foils and / or rods and / or spray bars / grids, which can be connected to each other, for example, by welding, gluing, or clipping. This allows the use of packing elements that can be manufactured relatively inexpensively, thus reducing the costs of gas scrubbing.

[0024] The packing elements can be made of plastic, preferably polypropylene, polyvinyl chloride, and / or GRP, or stainless steel. This allows for the use of relatively inexpensive packing elements, thus reducing the costs of gas scrubbing. "GRP" refers to glass-fiber-reinforced plastic, i.e., a fiber-plastic composite made of a plastic and glass fibers. Suitable plastics include both thermosetting plastics, such as polyester resins or epoxy resins, and thermoplastics, such as polyamide.

[0025] The packing elements can comprise several sections distributed throughout the height of the reaction vessel. This intensifies contact with the packing elements, increasing efficiency and facilitating the transfer of weight forces from the packing elements and the suspension flowing over them to the packing elements located further down and the supporting structure. Packing elements made of thinner materials can be used, thus reducing material consumption.

[0026] The supply device may comprise at least one fan.

[0027] The at least one fan can be designed to pass or push the ambient air through the reaction vessel and / or to suck the ambient air through the reaction vessel.

[0028] The device may further comprise a collecting device. The collecting device may be designed to collect the suspension conveyed through the reaction vessel. This allows the suspension to be selectively returned to the storage vessel, maintaining the cycle.

[0029] The storage container may also have a stirrer for stirring the suspension. Such a stirrer prevents the particles from the reaction from settling.

[0030] The reaction vessel may further include air inlet elements for admitting ambient air into the reaction vessel and a separator for separating droplets at the outlet from the reaction vessel. Air inlet elements and separators prevent light from entering and droplets from being entrained in the air stream.

[0031] The conveying device can comprise at least one pump. This allows the suspension to be conveyed easily.

[0032] The reaction vessel can be designed to allow ambient air to pass through the suspension in crossflow or counterflow. This allows the air flow and the suspension flow to be adjusted as needed to ensure sufficient contact.

[0033] The distribution device can have spray nozzles and / or troughs. Spray nozzles allow the suspension to be supplied at above atmospheric pressure, whereas troughs, such as overflow troughs or drip troughs, allow for pressureless supply.

[0034] The device can further comprise a supply line that fluidly connects the storage container and the distribution device. The supply line can have a first heat exchanger. A heat exchanger can thus be arranged in the suspension distribution line, with which the reaction heat released during the conversion of the absorbed CO2 is dissipated. Cooling preferably takes place to a temperature below or close to the dew point of the ambient air, so that little or no water evaporates from the circuit into the environment.

[0035] The device can further comprise a second heat exchanger arranged at the outlet. A heat exchanger can thus be arranged in the exhaust air, which dissipates the reaction heat released during the conversion of the absorbed CO2. Cooling preferably takes place to a temperature below or close to the dew point of the ambient air, so that little or no water evaporates from the circuit into the environment.

[0036] A separator can be arranged between the outlet and the second heat exchanger at the outlet. The separator can be designed to collect condensate and / or rainwater. For example, a separator can be arranged below the second heat exchanger to collect condensate and / or rainwater.

[0037] The device may further comprise a collecting line. The collecting line may be configured to fluidly connect the separator to the storage tank and / or a drain. For example, a separator may be arranged below the second heat exchanger to collect condensate and / or rainwater. This is then returned to the suspension reservoir and / or partially or completely discarded.

[0038] The device can further comprise a third heat exchanger arranged in the storage tank. A heat exchanger can thus be arranged in the storage tank, with which the reaction heat released during the conversion of the absorbed CO2 is dissipated. Cooling preferably takes place to a temperature below or close to the dew point of the ambient air, so that little or no water evaporates from the circuit into the environment.

[0039] The first heat exchanger, the second heat exchanger, and / or the third heat exchanger can be fluidly connected to an evaporator of a heat pump or designed as an evaporator of a heat pump. The heat exchanger(s) can thus feed the evaporator of a heat pump or be designed as an evaporator for one or more heat pumps, so that the reaction heat released and dissipated from the conversion of the absorbed CO2 can be raised to a usable temperature level and delivered to a consumer.

[0040] The device can further comprise a distribution line. The distribution line can be designed to supply air to the storage container, particularly as distributed air bubbles. A distributor can thus be additionally installed in the storage container, which draws in air from the environment and introduces it into the reservoir, creating a bubbling bed. This reduces or prevents sedimentation of the particles in the suspension and creates additional surface area for the absorption of CO2.

[0041] The distribution line can be equipped with a compressor. Such a compressor injects air into the suspension, creating a bubbling bed. This reduces or prevents the particles in the suspension from settling and creates additional surface area for the absorption of CO2.

[0042] In a further aspect of the present invention, a method for removing carbon dioxide from ambient air is proposed. The method comprises - Providing a suspension, the suspension comprising rock flour containing calcium oxide and / or magnesium oxide and water, - supplying ambient air, wherein the ambient air comprises carbon dioxide, such that the ambient air can be brought into contact with the suspension and the carbon dioxide reacts with the calcium oxide to form calcium carbonate and / or the magnesium oxide to form magnesium carbonate, and - Releasing carbon dioxide-depleted ambient air from the reaction vessel.

[0043] The process makes it easy to capture and mineralize carbon dioxide from the atmosphere. The spent sludge can be deposited, for example, in deeper ocean layers, which ultimately corresponds to the natural weathering process of basalt rock.

[0044] The method can use a device according to one of the embodiments described above or below. This allows the method to be implemented simply and cost-effectively.

[0045] The term "ambient air," as used herein, is a broad term to which its ordinary and customary meaning should be given, as understood by those skilled in the art. The term is not limited to any specific or adapted meaning. The term can refer, without limitation, in particular to atmospheric air in the vicinity of the device. Exhaust gases in the vicinity of the device, which may also originate from air-conditioning systems, could also be considered.

[0046] The term "reaction vessel" as used herein is a broad term to which its ordinary and customary meaning should be given, as understood by one skilled in the art. The term is not limited to any specific or adapted meaning. The term can, without limitation, refer in particular to any vessel designed to conduct a chemical reaction. Such a reaction vessel can also be referred to as a reactor. Such a reaction vessel can, in principle, comprise a bubble column or a trickle-flow reactor with packing, preferably structured.

[0047] The term "suspension," as used here, is a broad term to which its usual and common meaning should be given, as understood by those skilled in the art. The term is not limited to any specific or adapted meaning. The term can, without limitation, refer in particular to a heterogeneous mixture of a liquid and finely distributed solids (particles) therein. A suspension is a coarsely dispersed dispersion and tends toward sedimentation and phase separation. The solids are "suspended" in the liquid phase. Suspensions in water are also referred to as slurries in materials science or in naturally occurring forms. They are divided into "coarse" suspensions (particle size 0.1 mm to 1 mm, e.g., chalk mud) and "fine" suspensions (particle size 1 µm to 100 µm, e.g., lime milk).Even more finely dispersed particles (smaller than 1 µm) are dispersions, smaller than 1 nm are molecular dispersions.

[0048] The term "rock flour," as used herein, is a broad term to which its ordinary and common meaning should be given, as understood by those skilled in the art. The term is not limited to any specific or adapted meaning. The term can, without limitation, refer in particular to ground rock, also known as rock flour or glacial flour, which consists of fine-grained, silt-sized rock particles produced by mechanically grinding bedrock through glacial erosion or by artificial grinding to a similar size. Because the material is very fine-grained, it is suspended in water. In principle, any rock rich in calcium oxide and / or magnesium oxide, such as diabase or basalt, can be used as rock flour in the context of the present invention.

[0049] The term "carbonate," as used herein, is a broad term to which its ordinary and customary meaning should be given, as understood by one skilled in the art. The term is not limited to any specific or adapted meaning. The term can, without limitation, refer in particular to the inorganic salts and organic esters of carbonic acid (H2CO3), which is by definition inorganic. Two series of salts are derived from this diprotic (dibasic) acid: the bicarbonates, also called primary carbonates, with the general formula MHCO3, and the secondary carbonates, with the general formula M2CO3 and MCO3, respectively, where "M" represents a singly or doubly positively charged cation, the overall charge being neutral towards the outside. The secondary carbonates are based on the doubly negatively charged carbonate ion CO3. 2- .

[0050] The term "supply device" as used herein is a broad term to which its ordinary and customary meaning should be given, as understood by one skilled in the art. The term is not limited to any specific or adapted meaning. The term may, without limitation, refer in particular to any device designed to supply ambient air to the reaction vessel. The supply device may, in particular, pass or cause the ambient air to flow through the reaction vessel or force it into it. For this purpose, the supply device may comprise a compressor or condenser, a blower or fan, or any type of mechanical conveying device for conveying air.

[0051] The term "depleted," as used herein, is a broad term to which its ordinary and customary meaning should be given, as understood by those skilled in the art. The term is not limited to any specific or adapted meaning. The term may, without limitation, refer in particular to a lower concentration of a particular substance, especially carbon dioxide, than before a chemical reaction.

[0052] The term "wash bottle," as used herein, is a broad term to which its ordinary and customary meaning should be given, as understood by one skilled in the art. The term is not limited to any specific or adapted meaning. The term can, without limitation, refer in particular to a (laboratory) device that is connected to a gas flow, whereby the gas is forced by means of a dip tube to bubble through a liquid before leaving the container again. It serves to clean ("wash") gases. The bottle is filled with a solvent into which the gas-supplying tube is immersed. The directly introduced bubbling gases are partially or completely freed of impurities by leaving them in the solvent. The scrubbed gases can then be withdrawn through a second tube at the top of the container.The actual introduction of the gas into the liquid can, in the simplest case, be achieved through a glass tube; alternatively, perforated nozzle plates or frits made of a variety of materials are used. This method is intended to create the smallest possible gas bubbles, thus creating a large contact area between the gas and the liquid. The material used in the laboratory is primarily glass – preferably transparent – ​​but bottles made of chemically resistant plastics and, in rare cases, even metal are also available. For larger structures, a concrete construction is conceivable. The primary purpose is to ensure close contact between the gas and the scrubbing liquid or suspension.

[0053] The term "internals" as used here is a broad term to which its usual and common meaning should be given, as understood by one skilled in the art. The term is not limited to a specific or adapted meaning. The term can, without limitation, refer in particular to internal components of a reaction vessel as internals. They usually serve to direct flow, such as baffles in stirred tanks, wind or flow deflectors, inlet pipes, liquid collectors / distributors, phase separation, such as mist eliminators, or to create a large mass transfer surface, such as column internals in the form of trays (exchange trays), random packings or unstructured packings, or structured packings.

[0054] The term "packing element," as used here, is a broad term that should be given its usual and common meaning as understood by a person skilled in the art. The term is not limited to a specific or adapted meaning. The term can, without limitation, refer in particular to unstructured internals in apparatus in process engineering and apparatus construction. They are used in chemical processes in mostly two-phase mixtures to increase the effective surface area by creating turbulence while simultaneously maintaining low flow resistance. They are used, for example, in columns. Packing elements are made from various materials depending on their intended use, e.g. stainless steel (as in the chemical industry), plastic (as for fouling elements in biological water treatment), or ceramic.

[0055] The term "structured packing," as used herein, is a broad term to which its ordinary and customary meaning should be given, as understood by those skilled in the art. The term is not limited to any specific or adapted meaning. The term can refer, without limitation, in particular to specially designed vessel internals in absorber vessels (or columns), distillation columns, and fixed-bed reactors. Structured packing usually consists of thin, corrugated, and perforated metal plates or wire mesh. The design is intended to ensure optimal exchange between the different phases (liquid / gas or liquid / liquid) with minimal pressure resistance.

[0056] The term "separator," as used here, is a broad term that should be given its usual and common meaning as understood by a person skilled in the art. The term is not restricted to any specific or adapted meaning. The term can, without limitation, refer in particular to a device for separating liquid droplets from flowing gaseous media, such as air or process gases. The term "separator" is used synonymously with the term "droplet eliminator." Droplet eliminators utilize the higher inertia of liquid droplets compared to the lower inertia of the gas carrying them. For this purpose, the moist gas is passed through internals in which the flow direction of the gas is repeatedly deflected. The liquid droplets cannot follow these changes in direction, which is why they impact the internals and settle there. As the droplets become increasingly deposited, they flow downwards.The liquid can then be collected in a collecting chamber. Droplet separators are usually installed near the device outlet. How the liquid transported by the droplets is drained and collected is important, as a re-transition from the liquid phase to the gas phase must be prevented. The adhesion of the droplets to the internals is referred to as "primary separation", while the drainage of the forming liquid film is referred to as "secondary separation". During gas scrubbing, a gas (e.g. exhaust air from a combustion process) flows through a constantly humidified area in which solids and pollutants are absorbed by the scrubbing liquid (e.g. water). The gas also absorbs some of the liquid in the process. To ensure that this gas leaves the device dry, droplet separators are installed near the device outlet. Gas scrubbers are usually designed with droplet separators.

[0057] Furthermore, within the scope of the present invention, a computer program is proposed which, when run on a computer or computer network, executes the method according to the invention in one of its embodiments.

[0058] Furthermore, within the scope of the present invention, a computer program with program code means is proposed for implementing the method according to the invention in one of its embodiments when the program is executed on a computer or computer network. In particular, the program code means can be stored on a computer-readable data carrier and / or a computer-readable storage medium.

[0059] The terms "computer-readable medium" and "computer-readable storage medium," as used herein, may refer in particular to non-transitory data storage devices, such as a hardware data storage medium on which computer-executable instructions are stored. The computer-readable medium or computer-readable storage medium may, in particular, be or include a storage medium such as a random-access memory (RAM) and / or a read-only memory (ROM).

[0060] Furthermore, within the scope of the present invention, a data carrier is proposed on which a data structure is stored which, after being loaded into a working and / or main memory of a computer or computer network, can execute the method according to the invention in one of its embodiments.

[0061] Furthermore, within the scope of the present invention, a non-transient computer-readable medium is proposed, comprising instructions which, when executed by one or more processors, cause the one or more processors to perform a method according to one of the embodiments described above or below.

[0062] Also proposed within the scope of the present invention is a computer program product with program code means stored on a machine-readable carrier in order to carry out the method according to the invention in one of its embodiments when the program is executed on a computer or computer network.

[0063] A computer program product is understood as a tradable product. It can, in principle, exist in any form, for example, on paper or a computer-readable data carrier, and can, in particular, be distributed via a data transmission network.

[0064] Finally, within the scope of the present invention, a modulated data signal is proposed which contains instructions executable by a computer system or computer network for carrying out a method according to one of the described embodiments.

[0065] With regard to the computer-implemented aspects of the invention, one, several, or even all of the method steps of the method according to one or more of the embodiments proposed here can be performed by means of a computer or computer network. Thus, in general, any of the method steps, including the provision and / or manipulation of data, can be performed by means of a computer or computer network. In general, these steps can comprise any of the method steps, except for the steps that require manual work, for example, the provision of samples and / or certain aspects of performing actual measurements.

[0066] In summary, without limiting further possible embodiments, the following embodiments are proposed: Embodiment 1: Device for removing carbon dioxide from ambient air, comprising at least one reaction vessel for receiving a suspension, the suspension comprising rock flour containing calcium oxide and / or magnesium oxide and water, a supply device for supplying ambient air to the reaction vessel, wherein the ambient air comprises carbon dioxide, such that the ambient air can be brought into contact with the suspension and the carbon dioxide reacts with the calcium oxide to form calcium carbonate and / or the magnesium oxide to form magnesium carbonate, and an outlet from the reaction vessel for discharging carbon dioxide-depleted ambient air from the reaction vessel. Embodiment 2: Device according to the preceding embodiment, wherein the reaction vessel comprises at least one wash bottle, wherein the wash bottle is designed to receive the suspension, wherein the supply device is designed to pass the ambient air through the wash bottle. Embodiment 3: Device according to the preceding embodiment, wherein the supply device comprises a compressor. Embodiment 4: Device according to the preceding embodiment, wherein the compressor is arranged upstream of the washing bottle. Embodiment 5: Device according to embodiment 1, further comprising a storage container for storing the suspension, a conveying device for conveying the suspension to the reaction container, wherein the reaction container has internals, a distribution device for distributing the suspension to the internals in the reaction container and a return line for returning the suspension from the reaction container to the storage container. Embodiment 6: Device according to the preceding embodiment, wherein the internals comprise packing. Embodiment 7: Device according to the preceding embodiment, wherein the filling bodies comprise structured foils and / or rods and / or spray bars / grids, which can be connected to one another, for example, by welding, gluing or clipping. Embodiment 8: Device according to the preceding embodiment, wherein the filling bodies are made of plastic, preferably polypropylene, polyvinyl chloride and / or GRP, or of stainless steel Embodiment 9: Device according to one of embodiments 5 to 8, wherein the supply device comprises at least one fan. Embodiment 10: Device according to the preceding embodiment, wherein the at least one fan is designed to pass or push the ambient air through the reaction vessel and / or to suck the ambient air through the reaction vessel. Embodiment 11: Device according to one of embodiments 5 to 10, further comprising a collecting device, wherein the collecting device is designed to collect suspension conveyed through the reaction vessel. Embodiment 12: Device according to one of embodiments 5 to 11, wherein the storage container further comprises a stirrer for stirring the suspension. Embodiment 13: Device according to one of embodiments 5 to 12, wherein the reaction vessel further comprises air inlet elements for admitting ambient air into the reaction vessel and a separator for separating droplets at the outlet from the reaction vessel. Embodiment 14: Device according to one of embodiments 5 to 13, wherein the conveying device comprises at least one pump. Embodiment 15: Device according to one of embodiments 5 to 14, wherein the reaction vessel is designed to allow the ambient air to pass through in cross-flow or counter-flow to the suspension. Embodiment 16: Device according to one of embodiments 5 to 15, wherein the distribution device has spray nozzles and / or gutters. Embodiment 17: Device according to one of embodiments 5 to 16, further comprising a supply line that fluidly connects the storage container and the distribution device, wherein the supply line has a first heat exchanger. Embodiment 18: Device according to one of embodiments 5 to 17, further comprising a second heat exchanger arranged at the outlet. Embodiment 19: Device according to the preceding embodiment, wherein a separator is arranged between the outlet and the second heat exchanger at the outlet, wherein the separator is designed to collect condensate and / or rainwater. Embodiment 20: Device according to the preceding embodiment, further comprising a collecting line, wherein the collecting line is designed for fluidly connecting the separator to the storage container and / or a drain. Embodiment 21: Device according to one of embodiments 5 to 20, further comprising a third heat exchanger arranged in the storage container. Embodiment 22: Device according to one of embodiments 17 to 21, wherein the first heat exchanger and / or the second heat exchanger and / or the third heat exchanger is fluidly connected to an evaporator of a heat pump or is designed as an evaporator of a heat pump. Embodiment 23: Device according to one of embodiments 5 to 22, further comprising a distribution line, wherein the distribution line is designed to supply air into the storage container, in particular as distributed air bubbles. Embodiment 24: Device according to the preceding embodiment, wherein the distribution line comprises a compressor. Embodiment 25: A method for removing carbon dioxide from ambient air, comprising - Providing a suspension, the suspension comprising rock flour containing calcium oxide and / or magnesium oxide and water, - supplying ambient air, wherein the ambient air comprises carbon dioxide, such that the ambient air can be brought into contact with the suspension and the carbon dioxide reacts with the calcium oxide to form calcium carbonate and / or the magnesium oxide to form magnesium carbonate, and - Releasing carbon dioxide-depleted ambient air from the reaction vessel. Embodiment 26: Method according to the preceding embodiment, wherein the method uses an apparatus according to any one of embodiments 1 to 24. Short description of the characters

[0067] Further details and features will become apparent from the following description of exemplary embodiments, particularly in conjunction with the subclaims. The respective features can be implemented individually or in combination with one another. The invention is not limited to the exemplary embodiments. The exemplary embodiments are illustrated schematically in the figures. Identical reference numerals in the individual figures designate identical or functionally identical elements, or elements that correspond to one another in terms of their functions.

[0068] In detail: Fig. 1 is a schematic representation of an apparatus for removing carbon dioxide from ambient air according to a first embodiment of the present invention; Fig. 2 is a schematic representation of an apparatus for removing carbon dioxide from ambient air according to a second embodiment of the present invention; Fig. 3 is a schematic representation of an apparatus for removing carbon dioxide from ambient air according to a third embodiment of the present invention; Fig. 4 is a schematic diagram of an apparatus for removing carbon dioxide from ambient air according to a fourth embodiment of the present invention; Fig. 5 is a schematic diagram of an apparatus for removing carbon dioxide from ambient air according to a fifth embodiment of the present invention; Fig. 6 is a schematic representation of an apparatus for removing carbon dioxide from ambient air according to a sixth embodiment of the present invention; Fig. 7 is a schematic diagram of an apparatus for removing carbon dioxide from ambient air according to a seventh embodiment of the present invention; Fig. 8 is a schematic diagram of an apparatus for removing carbon dioxide from ambient air according to an eighth embodiment of the present invention; Fig. 9 is a schematic diagram of an apparatus for removing carbon dioxide from ambient air according to a ninth embodiment of the present invention; Fig. 10 is a schematic representation of an apparatus for removing carbon dioxide from ambient air according to a tenth embodiment of the present invention; and Fig. 11 is a schematic representation of an apparatus for removing carbon dioxide from ambient air according to an eleventh embodiment of the present invention. Description of the embodiments

[0069] Fig. 1 shows a schematic representation of a device 100 for removing carbon dioxide from ambient air 102 according to a first embodiment of the present invention. The device 100 of the first embodiment is designed as a bubble reactor. The device 100 has at least one reaction vessel 104. The reaction vessel 104 is designed to hold a suspension 106. In particular, the reaction vessel 104 comprises at least one wash bottle 108. The wash bottle 108 is designed to hold the suspension 106. The suspension 106 comprises rock flour that has or contains calcium oxide and / or magnesium oxide, and water. The rock flour is basalt. Basalt flour contains approximately 10% each of calcium oxide (CaO) and magnesium oxide (MgO), as can be seen from Table 1 below. The values ​​given are approximate values. Table 1 Chemical analysis with average values

[0070] (Ouelle: www.carl-jaeger.de / PDF / Analysen / Rohstf / ABASALTM.PDF) Anteil in % SiO2 44,77 Al2O3 12,04 TiO2 2,38 FeO 7,61 Fe2O3 4,03 MnO 0,55 CaO 10,87 MgO 12,13 K2O 0,80 Na2O 2,10 P2O5 0,66 Glühverlust 3,26

[0071] The device 100 further comprises a supply device 110. The supply device 110 is designed to supply ambient air 102 to the reaction vessel 104. The ambient air 102 comprises carbon dioxide. Thus, the supply device 110 comprises a supply line 112 that is fluidly connected to an inlet 114 of the reaction vessel 104. The inlet 114 is located, for example, at a lower end 116 of the reaction vessel 104. The supply device 110 is designed, in particular, to pass the ambient air 102 through the wash bottle 108. For this purpose, the supply device 110 comprises a compressor 118. The compressor 118 is arranged upstream of the wash bottle 108 in the supply line 112.The ambient air 102 is supplied in such a way that the ambient air 102 can be brought into contact with the suspension 106 and the carbon dioxide reacts with the calcium oxide to form calcium carbonate and / or the magnesium oxide to form magnesium carbonate, as explained below.

[0072] Calcium oxide reacts with water to form calcium hydroxide according to the following reaction equation CaO (s) + H2O (1) → Ca(OH) 2(aq) (1) and upon addition of carbon dioxide according to the following reaction equation further to solid calcium carbonate Ca(OH) 2(aq) + CO 2(g) → CaCO 3(s) + H2O (1) . (2)

[0073] With further addition of carbon dioxide, calcium carbonate reacts further to form dissolved calcium bicarbonate according to the following reaction equation CaCO 3(s) + H2O (1) + CO 2(g) → Ca 2+ + 2HCO3. (3)

[0074] Since the reaction is reversible under moderate heat input according to reaction equation (3), one part of CO2 is absorbed sustainably for each part of CaO.

[0075] The reaction with magnesium oxide (MgO) proceeds analogously, so that, using the data in the analysis from Table 1, 217 kg of CO2 can be bound per ton of basalt flour. This process is part of the natural weathering of basalt rocks.

[0076] The device 100 further includes an outlet 120 from the reaction vessel 104 for discharging carbon dioxide-depleted ambient air 122 from the reaction vessel 104. The outlet 120 is located, for example, at an upper end 124 of the reaction vessel 104.

[0077] The device 100 may also have more than one reaction vessel 104. For example only, the device 100 has two reaction vessels 104, which are connected in series.

[0078] A method for removing carbon dioxide from ambient air 102 is described below. The method can be performed using the Fig. 1. The method comprises providing a suspension 106, wherein the suspension 106 comprises rock flour comprising calcium oxide and / or magnesium oxide, and water. The method further comprises supplying ambient air 102 comprising carbon dioxide such that the ambient air 102 can be brought into contact with the suspension 106 and the carbon dioxide reacts with the calcium oxide to form calcium carbonate and / or the magnesium oxide to form magnesium carbonate, as described above. The method further comprises discharging carbon dioxide-depleted ambient air 122 from the reaction vessel 104.

[0079] In other words, ambient air, such as air and / or exhaust gas, is pumped into the scrubber bottle 108, optionally by means of the compressor 118, where CO2 reacts with the CaO and / or MgO to form the corresponding carbonates. The CO2 then leaves the scrubber bottle 108 at the outlet 120 with a reduced CO2 concentration compared to the inlet 114. To improve efficiency on the gas side, several scrubber bottles 108 or reaction vessels 104 can be connected in series. The gas stream then leaves the last scrubber bottle 108 at the outlet 120 into the atmosphere with a reduced CO2 content compared to the inlet 114 of the first scrubber bottle 108.

[0080] The pH of the resulting sludge will be more or less alkaline, depending on the exact composition of the rock and the concentration in the sludge, and can be particularly favorable at pH 10-11. This is favorable for the process. As the sludge is consumed, the pH decreases. Adjusting a higher pH, for example, with caustic soda, leads to undesirable side reactions, and the production of the chemicals required for adjustment is estimated to generate more CO2 than is potentially captured. The sludge is consumed at the latest when the pH drops into the acidic range.

[0081] The temperature of the process is essentially determined by the need to minimize water evaporation and is therefore close to the dew point of the ambient air 102. The temperature is still limited to the boiling point of water. Higher temperatures between the dew point and boiling point increase the reaction rate, which in turn can be compensated for by the area (size of the apparatus).

[0082] Water can also be natural or artificial salt water, especially seawater, brackish water, etc. The presence of dissolved ions promotes the reaction or reaction rate.

[0083] Former open-pit mining areas and mines are also suitable for (final) storage. This shortens transport routes and reduces the costs of transport and storage.

[0084] Fig. Figure 2 shows a schematic representation of a device 100 for removing carbon dioxide from ambient air 102 according to a second embodiment of the present invention. Only the differences from the device 100 of the first embodiment are described below, and identical or comparable components and features are provided with the same reference numerals. The device 100 of the second embodiment is designed as a gas scrubber. The device 100 has a storage container 126. The storage container 126 is designed to store the suspension 106. The device 100 has a conveying device 128. The conveying device 128 is designed to convey the suspension 106 from the storage container 126 to the reaction container 104. The reaction container 104 has internals 130. The internals 130 include packing elements 132.The fillers 132 may comprise structured foils and / or rods and / or spray bars / grids, which may be connected to one another, for example, by welding, gluing, or clipping. The fillers 132 are made of plastic, preferably polypropylene, polyvinyl chloride, or fiberglass, or of stainless steel.

[0085] The device further comprises a distribution device 134. The distribution device 134 is designed to distribute the suspension 106 to the internals 130 in the reaction vessel 104. The distribution device 134 is arranged at the upper end 124 of the reaction vessel 104. The distribution device 134 has, for example, spray nozzles and / or channels, by means of which the suspension 106 can be distributed. The device 100 has a supply line 136 that fluidly connects the storage vessel 126 and the distribution device 134. The conveying device 128 comprises at least one pump 138. The pump 138 is arranged in the supply line 136. The suspension 106 can be conveyed by means of the pump 138 from the storage vessel 126 to the inlet 114 or the distribution device 134. Alternatively, the pump 138 can also be designed as a submersible pump in the storage tank 126.

[0086] The device 100 further comprises a return line 140. The return line 140 is designed to return the suspension 106 from the reaction vessel 104 to the storage vessel 126. The device 100 further comprises a collecting device 142. The collecting device 142 is designed to collect suspension 106 conveyed through the reaction vessel 104. The collecting device 142 is fluidly connected to the return line 140, so that the collected suspension 106 can be returned from the collecting device 142 to the storage vessel 126.

[0087] The supply device 110 has at least one fan 144. The fan 144 is designed to pass the ambient air 102 through the reaction vessel 104. The reaction vessel 104 further has air inlet elements 146 for admitting the ambient air 102 into the reaction vessel 104 and a separator 148 for separating droplets at the outlet 120 from the reaction vessel 104. In the embodiment shown, the inlet 114 and the outlet 120 are arranged laterally on the reaction vessel 104. Accordingly, the reaction vessel 104 is designed to pass the ambient air 102 in crossflow to the suspension 106. The storage vessel 126 further has an optional stirrer 150 for stirring the suspension 106.

[0088] The operation of the device 100 of the second embodiment is modified compared to the first embodiment, as described below. The suspension 106 is pumped from the storage container 126 by means of the pump 138 to the distribution device 134, from where the suspension 106 passes through the internals 130 to the collection device 142 and flows back into the storage container 126.

[0089] Ambient air 102 or exhaust gas is conveyed through the internals 130 or packing 132 by the fan 144 and leaves the reaction vessel 104 at the outlet 120 with a reduced CO2 concentration into the atmosphere. The air inlet elements 146 and the separator 148 prevent light from entering and prevent droplets from being entrained in the air stream. In the packing 132, intensive contact occurs between the gas phase and the liquid suspension 106 over a large surface area. As a result, CO2 dissolves from the ambient air 102 and can react, as described above, to form solid CaCO3 and / or MgCO3. To prevent the particles from settling in the storage vessel 126, the stirrer 150 can be installed.

[0090] Fig. Figure 3 shows a schematic representation of a device 100 for removing carbon dioxide from ambient air 102 according to a third embodiment of the present invention. Only the differences from the device 100 of the second embodiment are described below, and identical or comparable components and features are provided with the same reference numerals. In the device 100 of the third embodiment, the outlet 120 is located at the upper end 124 of the reaction vessel 104. The separator 148 is also located at the upper end 124 of the reaction vessel 104. As an alternative to the device 100 of the third embodiment, Fig. In the second embodiment shown in Figure 2, the reaction vessel 104 of the third embodiment is designed to allow the ambient air 102 to pass countercurrently to the suspension 106. Otherwise, the operation and functioning do not differ from the device 100 of the second embodiment. The pump 138 can also be designed as a submersible pump in the storage vessel 126 in this embodiment.

[0091] Fig. 4 shows a schematic representation of a device 100 for removing carbon dioxide from ambient air 102 according to a fourth embodiment of the present invention. Only the differences from the device 100 of the third embodiment are described below, and identical or comparable components and features are provided with the same reference numerals. In the device 100 of the fourth embodiment, the fan 144 is designed to draw the ambient air 102 through the reaction vessel 104. For this purpose, the fan 144 is located at the upper end 124 of the reaction vessel 104. Otherwise, the operation and functioning do not differ from the device 100 of the third embodiment.

[0092] Fig. 5 shows a schematic representation of a device 100 for removing carbon dioxide from ambient air 102 according to a fifth embodiment of the present invention. Only the differences from the device 100 of the third embodiment are described below, and identical or comparable components and features are provided with the same reference numerals. In the device 100 of the fifth embodiment, the supply line 136 has a first heat exchanger 152. The suspension 106 conveyed to the distribution device 134 can be cooled by means of the first heat exchanger 152. The reaction heat released during the conversion of the absorbed CO2 can thus be dissipated by means of the first heat exchanger 152. The cooling preferably takes place to a temperature below or close to the dew point temperature of the ambient air 102, so that little or no water evaporates from the circuit into the environment.Otherwise, the operation and functioning do not differ from the device 100 of the third embodiment.

[0093] Fig. 6 shows a schematic representation of a device 100 for removing carbon dioxide from ambient air 102 according to a sixth embodiment of the present invention. Only the differences from the device 100 of the third embodiment are described below, and identical or comparable components and features are provided with the same reference numerals. In the device 100 of the sixth embodiment, a second heat exchanger 154 is arranged at the outlet 120. This allows the ambient air 122, which has been depleted of carbon dioxide, to be cooled. The reaction heat released during the conversion of the absorbed CO2 can be dissipated by means of the second heat exchanger 154. The cooling preferably takes place to a temperature below or close to the dew point temperature of the ambient air 102, so that little or no water evaporates from the circuit into the environment.Otherwise, the operation and functioning do not differ from the device 100 of the third embodiment. It is explicitly emphasized that the device 100 of the sixth embodiment can be combined with the device 100 of the fifth embodiment with regard to the provision of the heat exchangers 152, 154.

[0094] Fig. 7 shows a schematic representation of a device 100 for removing carbon dioxide from ambient air 102 according to a seventh embodiment of the present invention. Only the differences from the device 100 of the third embodiment are described below, and identical or comparable components and features are provided with the same reference numerals. In the device 100 of the seventh embodiment, a second heat exchanger 154 is arranged at the outlet 120. This allows the ambient air 122 depleted of carbon dioxide to be cooled. The reaction heat released during the conversion of the absorbed CO2 can be dissipated by means of the second heat exchanger 154. The cooling preferably takes place to a temperature below or close to the dew point temperature of the ambient air 102, so that little or no water evaporates from the circuit into the environment.The separator 148 is also located at the outlet 120 at the upper end 124 of the reaction vessel 104. More precisely, the separator 148 is located between the outlet 120 and the second heat exchanger 154 at the outlet 120. In particular, the separator 148 is arranged below the second heat exchanger 154. The separator 148 is designed to collect condensate and / or rainwater. The device 100 further comprises a collecting line 156. The collecting line 156 is designed to fluidly connect the separator 148 to the storage vessel 126 and / or a drain 158. The collected condensate and / or rainwater can thus be returned to the storage vessel 126 and / or discarded in whole or in part. Otherwise, the mode of operation and functionality do not differ from the device 100 of the third embodiment.

[0095] Fig. 8 shows a schematic representation of a device 100 for removing carbon dioxide from ambient air 102 according to an eighth embodiment of the present invention. Only the differences from the device 100 of the third embodiment are described below, and identical or comparable components and features are provided with the same reference numerals. The device 100 of the eighth embodiment has a third heat exchanger 160 arranged in the storage container 126. The suspension 106 located in the storage container 126 can be cooled by means of the third heat exchanger 160. The reaction heat released during the conversion of the absorbed CO2 can thus be dissipated by means of the third heat exchanger 160. The cooling preferably takes place to a temperature below or close to the dew point temperature of the ambient air 102, so that little or no water evaporates from the circuit into the environment.Otherwise, the operation and functioning do not differ from the device 100 of the third embodiment. It is explicitly emphasized that the device 100 of the eighth embodiment can be combined with the device 100 of the fifth embodiment and / or sixth embodiment with regard to the provision of the heat exchangers 152, 154, 160.

[0096] Fig. 9 shows a schematic representation of a device 100 for removing carbon dioxide from ambient air 102 according to a ninth embodiment of the present invention. Only the differences from the device 100 of the fifth to eighth embodiments are described below, and identical or comparable components and features are provided with the same reference numerals. In the device 100 of the ninth embodiment, depending on the precise design, the first heat exchanger 152, the second heat exchanger 154, and / or the third heat exchanger 160 are fluidly connected to an evaporator 162 of a heat pump 164. In this way, one or more heat exchangers 152, 154, 160 feed the evaporator 162 of the heat pump 164, so that the reaction heat released and removed from the conversion of the absorbed CO2 can be raised to a usable temperature level and delivered to a consumer 166.

[0097] Fig. 10 shows a schematic representation of a device 100 for removing carbon dioxide from ambient air 102 according to a tenth embodiment of the present invention. Only the differences from the device 100 of the ninth embodiment are described below, and identical or comparable components and features are provided with the same reference numerals. In the device 100 of the tenth embodiment, depending on the precise design, the first heat exchanger 152, the second heat exchanger 154, and / or the third heat exchanger 160 are designed as evaporators 162 of a heat pump 164. In this way, one or more heat exchangers 152, 154, 160 are designed as evaporators 162 of the heat pump 164, so that the reaction heat released and dissipated from the conversion of the absorbed CO2 can be raised to a usable temperature level and delivered to a consumer 166.

[0098] Fig.11 shows a schematic representation of a device 100 for removing carbon dioxide from ambient air 102 according to an eleventh embodiment of the present invention. Only the differences from the device 100 of the third embodiment are described below, and identical or comparable components and features are provided with the same reference numerals. The device 100 of the eleventh embodiment comprises a distribution line 168. The distribution line 168 is designed to supply air 170 to the storage container 126. The air 170 can be supplied to the storage container 126 as distributed air bubbles. The air 170 can originate from an air source or, alternatively, be ambient air 102 and thus be drawn in from the environment. To convey the air 170 into the storage container 126, the distribution line 168 can have a compressor 172.In this way, the air 170 is forced into the reservoir 126, creating a bubbling bed, which reduces or prevents sedimentation of the particles in the suspension 106 and creates additional surface area for the absorption of CO2. Otherwise, the operation and functioning do not differ from the device 100 of the third embodiment.

[0099] In general, for the previously described embodiments, the ambient air 102 will generally be at ambient pressure and thus at approximately 1 bar absolute. Only exhaust gases from combustion engines could have higher pressures, but this would be at the expense of the efficiency of the combustion engine. Designs that include fans can, for technical reasons, only increase this pressure by 1000 to 2000 Pa, while the pressure loss on the gas side via the internals would be only 50 to 200 Pa. The pressure increase would therefore increase energy consumption by an order of magnitude. For designs with compressors and scrubber bottles, higher pressures are technically feasible and would lead to a higher concentration of the initially dissolved CO2 in the liquid, thereby increasing the reaction rate.However, this only results in smaller devices, as speed can be replaced by area, but at the same time, the compressor requires more power. Consequently, the process is preferably used at pressures between ambient air pressure and a pressure higher than ambient air pressure by up to approximately 2000 Pa. List of reference symbols 100 device 102 Ambient air 104 reaction vessels 106 Suspension 108 Wash bottle 110 Feed device 112 supply line 114 Entrance 116 lower end 118 Compressor 120 outlet 122 carbon dioxide-depleted ambient air 124 upper end 126 storage containers 128 Conveyor device 130 fixtures 132 packings 134 Distribution device 136 supply line 138 Pump 140 Return line 142 collection device 144 Fan 146 air intake elements 148 separators 150 stirrers 152 first heat exchanger 154 second heat exchanger 156 Collective line 158 Process 160 third heat exchanger 162 evaporators 164 heat pump 166 consumers 168 distribution line 170 air 172 Compressor QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] WO 2008 / 101293 A1

[0003] WO 2010 / 088738 A1

[0004] US 2015 / 030523 A1

[0005] Zitierte Nicht-Patentliteratur

[0000] Modelling a basalt reactor for direct air CO2 capture“, Environmental Earth Sciences (2022) 81:194

[0006] A novel high pressure column flow reactor for experimental studies of CO2 mineral storage“, Applied Geochemistry 30 (2013) 91-104

[0007] Experimental studies of basalt-H2O-CO2 interaction with a high pressure column flow reactor: the mobility of metals“, Energy Procedia 37 (2013) 5823 - 5833

[0007] www.carl-jaeger.de / PDF / Analysen / Rohstf / ABASALTM.PDF

[0070]

Claims

[1] Device (100) for removing carbon dioxide from ambient air (102), comprising at least one reaction container (104) for receiving a suspension (106), wherein the suspension (106) comprises rock flour containing calcium oxide and / or magnesium oxide, and water, a supply device (110) for supplying ambient air (102) to the reaction vessel (104), wherein the ambient air (102) comprises carbon dioxide, such that the ambient air (102) can be brought into contact with the suspension (106) and the carbon dioxide reacts with the calcium oxide to form calcium carbonate and / or the magnesium oxide to form magnesium carbonate, and an outlet (120) from the reaction vessel (104) for discharging (120) carbon dioxide-depleted ambient air (122) from the reaction vessel (104). [2] Device (100) according to the preceding claim, wherein the reaction container (104) comprises at least one wash bottle (108), wherein the wash bottle (108) is designed to receive the suspension (106), wherein the supply device (110) is designed to pass the ambient air (102) through the wash bottle (108). [3] Device (100) according to the preceding claim, wherein the supply device (110) comprises a compressor (118). [4] Device (100) according to the preceding claim, wherein the compressor (118) is arranged upstream of the washing bottle (108). [5] Device (100) according to claim 1, further comprising a storage container (126) for storing the suspension (106), a conveying device (128) for conveying the suspension (106) to the reaction container (104), wherein the reaction container (104) has internals (130), a distribution device (134) for distributing the suspension (106) to the internals (130) in the reaction container (104) and a return line (140) for returning the suspension (106) from the reaction container (104) to the storage container (126). [6] Device (100) according to the preceding claim, wherein the internals (130) comprise filler bodies (132). [7] Device (100) according to the preceding claim, wherein the filling bodies (132) comprise structured foils and / or rods and / or spray bars / grids, which are preferably connected to one another by welding, gluing or clipping. [8] Device (100) according to the preceding claim, wherein the filling bodies (132) are made of plastic, preferably polypropylene, polyvinyl chloride or GRP, or of stainless steel [9] Device (100) according to one of claims 5 to 8, wherein the supply device (110) comprises at least one fan (144). [10] Device (100) according to the preceding claim, wherein the at least one fan (144) is designed to pass or force the ambient air (102) through the reaction vessel (104) and / or to suck the ambient air (102) through the reaction vessel (104). [11] Device (100) according to one of claims 5 to 10, further comprising a collecting device (142), wherein the collecting device (142) is designed to collect suspension (106) conveyed through the reaction vessel (104). [12] Device (100) according to one of claims 5 to 11, wherein the storage container (126) further comprises a stirrer (150) for stirring the suspension (106). [13] The device (100) of any one of claims 5 to 12, wherein the reaction vessel (104) further comprises air inlet elements (146) for admitting ambient air (102) into the reaction vessel (104) and a separator (148) for separating droplets at the outlet (120) from the reaction vessel (104). [14] Device (100) according to one of claims 5 to 13, wherein the conveying device (128) comprises at least one pump (138). [15] Device (100) according to one of claims 5 to 14, wherein the reaction vessel (104) is designed to allow the ambient air (102) to pass through in cross-flow or counter-flow to the suspension (106). [16] Device (100) according to one of claims 5 to 15, wherein the distribution device (134) comprises spray nozzles and / or gutters. [17] Device (100) according to one of claims 5 to 16, further comprising a supply line fluidly connecting the storage container (126) and the distribution device (134), the supply line having a first heat exchanger (152). [18] Device (100) according to one of claims 5 to 17, further comprising a second heat exchanger (154) arranged at the outlet (120). [19] Device (100) according to the preceding claim, wherein a separator (148) is arranged between the outlet (120) and the second heat exchanger (154) at the outlet (120), wherein the separator (148) is designed to collect condensate and / or rainwater. [20] Device (100) according to the preceding claim, further comprising a collecting line (156), wherein the collecting line (156) is designed for fluidly connecting the separator (148) to the storage container (126) and / or a drain (158). [21] Device (100) according to one of claims 5 to 20, further comprising a third heat exchanger (160) arranged in the storage container (126). [22] Device (100) according to one of claims 17 to 21, wherein the first heat exchanger (152), the second heat exchanger (154) and / or the third heat exchanger (160) is fluidly connected to an evaporator (162) of a heat pump (164) or is designed as an evaporator (162) of a heat pump (164). [23] Device (100) according to one of claims 5 to 22, further comprising a distribution line (168), wherein the distribution line (168) is designed to supply air (170) into the storage container (126), in particular as distributed air bubbles. [24] Device (100) according to the preceding claim, wherein the distribution line (168) comprises a compressor (172). [25] A method for removing carbon dioxide from ambient air (102), comprising Providing a suspension (106), wherein the suspension (106) comprises rock flour comprising calcium oxide and / or magnesium oxide, and water, Supplying ambient air (102), wherein the ambient air (102) comprises carbon dioxide, such that the ambient air (102) can be brought into contact with the suspension (106) and the carbon dioxide reacts with the calcium oxide to form calcium carbonate and / or the magnesium oxide to form magnesium carbonate, and Releasing carbon dioxide-depleted ambient air (122) from the reaction vessel (104). [26] A method according to the preceding claim, wherein the method uses a device (100) according to any one of claims 1 to 24.

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