Method for separating carbon dioxide from the ambient air and facility for carrying out such a method

Abstract

The invention relates to a method for separating carbon dioxide from the ambient air (60). It is provided that ambient air (60) is fed into a process chamber (12) of a facility (10) for separating carbon dioxide from the ambient air and is conducted through an adsorption unit (14). In this method, carbon dioxide is temporarily stored in the adsorption unit (14) and is released again later by an at least partial evacuation of the process chamber and a heating of the adsorption unit (14). In this method, an inert gas, in particular steam, is introduced into the process chamber (12), in order to assist the discharging of the temporarily stored carbon dioxide from the adsorption unit (14) and to increase the carbon dioxide concentration in the process chamber (12). The invention also relates to a facility (10) for carrying out such a method.

Description

[0001] Description

[0002] Process for the separation of carbon dioxide from the ambient air and plant for carrying out such a process

[0003] The invention relates to a process for separating carbon dioxide (CO2) from the ambient air and to a plant for carrying out such a process according to the preamble of the independent patent claims.

[0004] To reduce the carbon dioxide content in the ambient air and achieve climate neutrality, not only must carbon dioxide emissions be reduced, but unavoidable carbon dioxide emissions must also be compensated accordingly. One option for compensating these carbon dioxide emissions is to capture carbon dioxide from the ambient air. This process is also known as a direct air capture process. Alternatively, or additionally, carbon dioxide emissions can be compensated by permanently storing carbon dioxide in a reservoir, particularly in a rock layer, thus preventing it from entering the atmosphere.

[0005] In principle, systems and processes for capturing carbon dioxide from ambient air are known. Such capture can be carried out, for example, using the so-called "direct air capture" process, in which the carbon dioxide can be captured directly from the ambient air and fed into a further process.

[0006] Most known processes for separating carbon dioxide from ambient air employ a combination of pressure and temperature swing processes. Depending on the choice of negative pressure during desorption, the temperature ranges between adsorption and desorption, and the properties of the sorbent material, a carbon dioxide purity of more than 70% can be achieved in the product stream. Very high purity of more than 95% is usually only possible with a very strong vacuum during desorption.

[0007] Multi-stage processes are also known from the state of the art in which the described adsorption units operate in cascaded succession. The product stream from a first unit is fed to a second unit as the adsorption medium. Depending on the choice of negative pressure (vacuum) in the desorption, the temperature ranges between adsorption and desorption, and the properties of the sorbent material, at least two, usually five or ten stages are required to achieve a very high purity of greater than 95% or even greater than 99%. In a multi-stage process, the design complexity of the entire plant is correspondingly high.

[0008] WO 2016 / 005226 A1 describes a process for capturing carbon dioxide from ambient air. The carbon dioxide is captured from the ambient air in a temperature-vacuum cycling process and absorbed into a sorbent. A disadvantage of this process, however, is that a severe negative pressure of up to 50 mbar absolute pressure is generated during the desorption phase. This places very high demands on the system design to ensure the necessary strength and tightness. These high demands are associated with correspondingly high system costs, making the process expensive and complex.

[0009] US 2010 / 0251 887 A1 discloses a process and system for separating carbon dioxide (CO2) from a CO2-containing gas stream containing water vapor and additional impurities, e.g., nitrogen, oxygen, sulfur oxides, nitrogen oxides, and mercury. The CO2 is separated by subjecting the CO2 gas stream to a temperature swing adsorption step. The temperature swing adsorption step comprises an adsorption step for producing a substantially dry, carbon dioxide-depleted stream and an adsorbent regeneration step comprising heating the adsorbent bed to produce a carbon dioxide stream substantially free of water vapor. Moisture from the CO2-containing gas stream is removed optionally by pressure swing adsorption, temperature swing adsorption, membrane separation, or absorption prior to CO2 capture.

[0010] US 2014 / 0 033 919 A1 discloses a pressure swing adsorption process for removing CO2 from natural gas streams. The process enables the removal of contaminants from gas streams, preferably natural gas streams, using rapid-cycle swing adsorption processes, such as rapid-cycle pressure swing adsorption (RC-PSA). Separations at high pressure with high product yield and / or high product purity are achieved through a combination of a carefully selected adsorbent, the gas-solid contact, the system configuration, and the cycle. The invention is based on the object of separating carbon dioxide from the ambient air in a comparatively simple and cost-effective manner and overcoming the disadvantages known from the prior art.

[0011] The task is solved by a process for separating carbon dioxide from the ambient air, which comprises the following steps:

[0012] Supplying ambient air to a plant for separating carbon dioxide from the ambient air,

[0013] Leading ambient air into a process space with an adsorption unit, wherein the ambient air is passed through the absorption unit and carbon dioxide is essentially chemically bound in the adsorption unit,

[0014] Closing the process room to prevent ambient air from entering the process room, evacuating the process room,

[0015] Heating the adsorption unit,

[0016] Release of carbon dioxide from the adsorption unit, whereby a carbon dioxide concentration in the process space increases,

[0017] Introducing an inert gas into the process chamber, whereby the introduction of the inert gas causes further carbon dioxide to be removed from the adsorption unit and the carbon dioxide concentration in the process chamber to be increased,

[0018] Opening the process chamber and extracting a carbon dioxide-inert gas mixture.

[0019] In this context, an inert gas is a gas that does not react with carbon dioxide under the conditions prevailing in the process chamber.

[0020] Furthermore, the inert gas does not react with the sorbent material in the adsorption unit. Examples of suitable inert gases include nitrogen (N2), the noble gases, and water vapor.

[0021] The process according to the invention enables an improved yield of carbon dioxide, which is obtained from the carbon dioxide chemically bound in the adsorption unit, with a lower plant load and lower demands on the plant components. While in prior art processes for separating carbon dioxide, a portion of the carbon dioxide bound in the absorption unit must be vented into the environment to achieve high carbon dioxide purity, the proposed process can increase the yield of carbon dioxide separated from the ambient air. In addition, the requirements for evacuating the process chamber are significantly lower than in prior art processes, so the requirements for the materials, in particular for a vacuum pump and the seals of the process chamber, are significantly lower.Furthermore, the requirements for the design of the process chamber itself are also lower, since a lower structural strength is sufficient for the low vacuum in the process chamber compared to known solutions. The process chamber can thus be designed more simply and cost-effectively without irreversibly deforming under the vacuum. Thus, these requirements can be met with comparatively inexpensive materials and system components, making the proposed process correspondingly cost-effective.

[0022] The additional features listed in the dependent claims enable advantageous further developments and improvements of the process for separating carbon dioxide from the ambient air proposed in the independent claim.

[0023] In a preferred embodiment of the invention, the inert gas is steam, and after the carbon dioxide-inert gas mixture has been extracted, the water contained in the steam is separated from the carbon dioxide-inert gas mixture by condensation. Steam is a comparatively inexpensive and readily available inert gas for the process. In particular, steam can also be easily separated from a gas stream containing carbon dioxide and residual air, thereby enabling simple removal of the steam from the carbon dioxide, so that carbon dioxide with a purity of more than 95%, preferably more than 99%, can be produced.

[0024] It is particularly preferred if the condensed water is evaporated again and fed into the process chamber as steam. This allows the water to be easily circulated and recycled, eliminating the need for external inert gas. By condensing the water vapor from the gas stream and feeding it to a steam generator, a closed circuit for the inert gas can be created, preventing the water from being released into the environment.

[0025] In an advantageous embodiment of the method, after heating the adsorption unit, a carbon dioxide-residual air gas mixture, which comprises the released carbon dioxide and the residual air in the process chamber, is drawn in and fed to an intermediate storage unit. By feeding a carbon dioxide-residual air gas mixture from the process chamber into an intermediate storage unit, the carbon dioxide yield can be further increased and even more carbon dioxide can be removed from the ambient air.

[0026] It is preferred that the carbon dioxide-residual air gas mixture be compressed to a pressure that is higher than the ambient pressure of the system. To enable easy supply to the intermediate storage, it is advantageous if the carbon dioxide-residual air gas mixture extracted from the at least partially evacuated process chamber is compressed and supplied to the intermediate storage. This allows a simple gas storage unit to be used as the intermediate storage unit, eliminating the need for additional evacuation.

[0027] A further improvement to the process involves feeding the carbon dioxide / residual air gas mixture from the intermediate storage tank back into the process chamber. This significantly increases the carbon dioxide concentration of the gas stream fed into the process chamber and further increases the yield of carbon dioxide separation from the ambient air. While the ambient air contains approximately 420 ppm of carbon dioxide, the carbon dioxide / residual air gas mixture from the intermediate storage tank has a carbon dioxide concentration of approximately 30-35%. This increases the chemical sorption of carbon dioxide in the adsorption unit.

[0028] It is particularly preferred that the carbon dioxide-residual air gas mixture be circulated via the intermediate storage unit back into the process chamber until a defined threshold value for the carbon dioxide concentration is reached. This allows a carbon dioxide gas stream with a carbon dioxide concentration of at least 95%, preferably at least 98%, and particularly preferably at least 99%, to be realized. Such a pure carbon dioxide gas stream is particularly suitable for supplying it as process gas to another plant, for example, a plant for producing a combustible fuel.

[0029] In a further preferred embodiment of the invention, it is provided that when evacuating the process chamber, the pressure in the process chamber is reduced to an absolute pressure of 300 mbar to 700 mbar, preferably 400 mbar to 600 mbar. In order to recover the carbon dioxide chemically bound in the adsorption unit, it is advantageous to reduce the pressure in the process chamber. Compared to processes known from the prior art, the process according to the invention can operate with a comparatively weak negative pressure, whereby the requirements for the plant technology can be kept low. This applies in particular to a vacuum pump, the sealing components, and the plant components arranged in the process chamber that are exposed to such a negative pressure.

[0030] Furthermore, in an advantageous embodiment of the method, the adsorption unit and / or a sorbent material (sorbent) located in the adsorption unit is heated to a temperature of 80°C to 110°C, preferably 85°C to 100°C, particularly preferably 90°C to 95°C, to release the bound carbon dioxide. In order to release the chemically bound carbon dioxide from the sorbent material of the adsorption unit, heating of the sorbent material is necessary. Within the specified temperature range, a particularly rapid release of the bound carbon dioxide from the sorbent material is achieved. Furthermore, thermal damage to the sorbent material is reliably prevented.

[0031] A further aspect of the invention relates to a system for separating carbon dioxide from the ambient air, which is configured to carry out a process described in the preceding paragraphs for separating carbon dioxide from the ambient air and subsequently rehumidifying the exhaust air. Such a system enables a simple, efficient, and inexpensive process for separating carbon dioxide from the ambient air. In particular, such a system can separate carbon dioxide from the ambient air particularly effectively and maximize the amount of separated carbon dioxide.

[0032] The various embodiments of the invention mentioned in this application can be advantageously combined with one another, unless otherwise stated in the individual case.

[0033] The invention is explained below in exemplary embodiments with reference to the accompanying drawings. They show:

[0034] Figure 1 shows a preferred embodiment of a system according to the invention for

[0035] Separation of carbon dioxide from the ambient air;

[0036] Figure 2 shows a flow diagram for carrying out a method according to the invention for separating carbon dioxide from the ambient air, and Figure 3 shows a diagram for loading / unloading a sorbent material in a

[0037] Process room of such a plant.

[0038] Figure 1 shows a schematic representation of a system 10 according to the invention for separating carbon dioxide from ambient air 60. The system comprises a process chamber 12 in which an adsorption unit 14 for the chemical adsorption of carbon dioxide is arranged. The adsorption unit 14 comprises a sorbent material 72 which chemically binds carbon dioxide and removes it from the ambient air 60. Amine-functionalized, porous materials are particularly suitable as the sorbent material 72. The sorbent material 72 is also referred to as a chemisorbent. The sorbent material 72 is stored as a fixed bed in the adsorption unit 72. The adsorption unit 14 arranged in the process chamber 12 can be heated by a temperature control unit 16, in particular by a heat exchanger 18. The process chamber 12 has a first inlet 20 through which ambient air 60 can flow into the process chamber 12.The system 10 further comprises a flow generator 42, in particular a fan, for directing an air flow of ambient air 60 through the process chamber 12. The process chamber 12 has a first inlet 20 for introducing ambient air 60 into the process chamber 12, which can be closed by an inlet valve 50. The process chamber 12 further has a second inlet 34, through which the process chamber 12 can be flooded with an inert gas 66, in particular water vapor 68. The second inlet 34 can be closed by a further inlet valve 50.

[0039] The process chamber 12 can be heated and / or cooled by a temperature control unit 16, wherein the temperature control unit 16 is preferably designed as a heat exchanger 18, which is operatively connected to the process chamber 12 and in particular to the adsorption unit 14 arranged in the process chamber 12. Alternatively or additionally, the process chamber 12 can also be heated and / or cooled via other heating means 24 or coolant 26. A pressure reduction unit 22 is also provided on the process chamber 12 in order to at least partially evacuate the process chamber 12 and reduce the absolute pressure in the process chamber 12 below the ambient pressure. The pressure reduction unit 22 comprises, in particular, a vacuum pump 28, which is configured to reduce the pressure in the process chamber 12 to an absolute pressure of 300 mbar to 700 mbar, preferably from 400 mbar to 600 mbar.The process chamber 12 further comprises a first outlet 36, which is preferably connected to the environment, and a second outlet 38, through which a carbon dioxide-rich gas stream 62, 64, 74, 78 can be discharged from the process chamber 12. The first outlet 36 and the second outlet 38 can be closed via corresponding outlet valves 52 in order to seal the process chamber 12 gas-tight from the environment.

[0040] The system 10 further comprises a steam generator 30, which is connected to the second inlet 34 of the process chamber 12 via a steam line 32. The second outlet 38 of the process chamber 12 is connected to a condenser 40, through which the moisture contained in the carbon dioxide-rich gas stream 62, 64, 74, 78 as well as the water vapor can be at least largely removed from the gas stream 62, 64, 74, 78. The condenser 40 is connected via a condensate return line 54 to a storage tank of the steam generator 30, into which the condensed water 76 can be returned and evaporated again by the steam generator 30 into water vapor.

[0041] A second connecting line 90 branches off from a connecting line 58, which connects the process chamber 12 to the condenser 40, and connects the connecting line 58 to an intermediate storage unit 44. An extraction unit 46 is arranged in the connecting line 58 to extract a carbon dioxide-rich gas stream 62, 64, 74, 78 from the process chamber 12. A compressor 70 is arranged in the second connecting line 90 to supply a carbon dioxide-residual air gas mixture 78 to the intermediate storage unit 44. The intermediate storage unit 44 is connected to an inlet of the process chamber 12 via a third connecting line 92 to supply the carbon dioxide-residual air gas mixture back to the process chamber 12.At the junction of the first connecting line 58 and the second connecting line 90, a switching element 48 is arranged, with which a gas flow from the process chamber can be directed either through the first connecting line 58 to the condenser 40 or through the second connecting line 90 to the intermediate storage 44.

[0042] A moist, carbon dioxide-rich process gas 62, in particular a carbon dioxide-inert gas mixture 74, is discharged from the process chamber via the first connecting line 58 and fed to the condenser 40. After the atmospheric humidity or water vapor 68 is removed from the moist, carbon dioxide-rich process gas 62, a dry, carbon dioxide-rich gas is produced, which can be stored and fed to another process for further use, in particular a process for producing a synthetic fuel. The system 10 further comprises a control unit 80 with a memory unit 82 and a computing unit 84, wherein a machine-readable program code 86 is stored in the memory unit 82. If this program code 86 is executed by the computing unit 84, the control unit 80 controls the method described below for separating carbon dioxide from the ambient air 60.

[0043] Figure 2 shows a method according to the invention for separating carbon dioxide from the ambient air 60. The method is designed as a temperature-pressure swing process and undergoes two cyclical main process steps: an adsorption phase, in which carbon dioxide from the ambient air 60 is chemically bound, and a desorption phase, in which this carbon dioxide is released again. In a first process step <100> The ambient air 60 is passed through the adsorption unit 14 in the process chamber 12 and chemically bound in the sorbent material 72 in the adsorption unit 14. The ambient air 60 contains approximately 0.04 volume percent carbon dioxide. The process is maintained until the sorbent material 72 is approximately 80% saturated.A further loading of the sorbent material up to 100% saturation is possible, but results in a disproportionately high time expenditure in relation to the amount of carbon dioxide absorbed. The water required for the chemical storage of the carbon dioxide is taken from the ambient air 60. Furthermore, in an additional process step <110> A carbon dioxide-residual air gas mixture 78 is introduced from the intermediate storage 44 into the process chamber 12, resulting in a carbon dioxide concentration of approximately 0.5-2 percent by volume, which is higher than the carbon dioxide concentration of the ambient air 60. These process steps are also referred to as the adsorption phase of the system 10.

[0044] This adsorption phase is followed by a desorption phase in which the carbon dioxide chemically bound in the sorbent material 72 is released again. For this purpose, in a process step <120> the inlet openings 20, 34 and the first outlet opening 36 are closed and no further ambient air 60 is passed through the process chamber 12 of the system 10. Furthermore, in a process step <130> the pressure in the process chamber 12 is reduced to an absolute pressure of 400 mbar to 600 mbar. In one process step <140> The sorbent material 72 is heated to a temperature of 90°C to 95°C, whereby the carbon dioxide chemically bound in the sorbent material 72 is released again. By releasing the carbon dioxide, the <150> the carbon dioxide concentration in the process chamber and the pressure in the process chamber.In a process step <160, the released carbon dioxide is extracted together with the residual air in the process chamber 12 as a carbon dioxide-residual air gas mixture 78 and fed into the intermediate storage 44, so that the pressure in the process chamber 12 can be kept constant in the range of 400 mbar to 600 mbar. The desorption proceeds until a carbon dioxide atmosphere has been established in the process chamber. In order to release further carbon dioxide from the sorbent material, in a process step <170> Water vapor 68 is introduced into the process chamber 12 as an inert gas 66 to reduce the carbon dioxide concentration in the process chamber 12. This initially reduces the CO2 concentration in the process chamber 12. However, this allows further carbon dioxide to be released, so that a carbon dioxide-inert gas mixture 74 can be discharged from the process chamber 12 as a moist, carbon dioxide-rich process gas 62.This moist, carbon dioxide-rich process gas 62 is in one process step <180> The moisture is removed, producing a dry, carbon dioxide-rich gas 64 with a carbon dioxide content of at least 95%. If no more carbon dioxide can be desorbed from the sorbent material 72, the system switches back to the adsorption phase and repeats the process steps.

[0045] During the initial desorption of carbon dioxide, i.e. when the process chamber 12 has already been evacuated to 400 mbar to 600 mbar absolute pressure and the sorbent material has been heated to a temperature of 90°C to 95°C, the residual air from the process chamber 12 is also sucked out, creating a carbon dioxide-residual air gas mixture 78. The carbon dioxide content of this gas mixture 78 increases with increasing desorption of the carbon dioxide from the sorbent material 72. Since this gas mixture does not have the desired carbon dioxide content at the beginning of the desorption phase, this gas mixture 78 is fed to an intermediate storage device 44 and fed back into the process chamber 12 in the next adsorption phase. For further use of the carbon dioxide (e.g. sequestration), a carbon dioxide purity of > 95%, ideally > 99%, is required.The impure portion is diverted from the product stream, compressed to approximately ambient pressure, and stored in the intermediate storage 44. This impure portion has a carbon dioxide concentration of approximately 35%. The amount of carbon dioxide contained therein corresponds to approximately 16% of the working stroke per adsorption and desorption cycle. The carbon dioxide-residual air gas mixture 78 stored in the intermediate storage 44 is fed into the intake air at the end of the subsequent adsorption process. This increases the carbon dioxide concentration in the intake air above the level of the ambient air 60 for a specific period of time, and more carbon dioxide can be absorbed in the adsorption phase. Preferably, the impure portion of the intake air is metered in such a way that a carbon dioxide concentration of between 0.4 and 1.0% results in the process chamber 12 at the end of the adsorption phase.This allows the loading of sorbent material 72 to be increased by 22%. In the subsequent desorption cycle, a slightly larger impure fraction is generated at the beginning. Cyclical recirculation of the impure fraction results in an increase in the working stroke and thus in productivity by approximately 10%.

[0046] Alternatively, the carbon dioxide-residual air gas mixture 78 from the intermediate storage unit 44 can also be fed to another adsorption unit 56. The adsorption units 14, 56 can operate in staggered fashion, thereby reducing the storage time and volume in the intermediate storage unit 44.

[0047] In addition, to shorten the duration of the adsorption phase, it is possible to terminate the loading of the sorbent material 72 at a saturation level of 25% to 70%. Although the working stroke of the sorbent material 72 is not fully utilized, the process cycles can be advantageously shortened and may even overcompensate for the effect of the lower loading.

[0048] Figure 3 shows a diagram for loading and unloading the sorbent material 72 with carbon dioxide. The process comprises the process steps described in Figure 2 in the order shown. A working cycle thus comprises a first phase I of desorption, in which an "impure" carbon dioxide-residual air gas mixture 78 is released, and a phase II, in which a carbon dioxide-inert gas mixture 74 is released. At time XXX, when the oxygen concentration in the residual gas is close to zero, the switching device is activated, and the gas flow is no longer fed into the intermediate storage device 44 in order to remove carbon dioxide with a high degree of purity of at least 95%, preferably at least 99%.

[0049] List of reference symbols

[0050] Plant Process room Adsorption unit Tempering unit Heat exchanger first inlet Pressure reduction unit Heating medium

[0051] Coolant vacuum pump

[0052] Steam generator Steam line second inlet first outlet second outlet

[0053] Condenser Flow generator Intermediate storage Suction unit Switching device

[0054] Inlet valve Exhaust valve

[0055] Condensate return line second adsorption unit connecting line ambient air moist, carbon dioxide-rich process gas dry, carbon dioxide-rich gas inert gas

[0056] Water vapor

[0057] compressor

[0058] Sorbent material

[0059] Carbon dioxide inert gas mixture

[0060] Water

[0061] Carbon dioxide-residual air gas mixture

[0062] control unit

[0063] storage unit

[0064] Computing unit

[0065] Program code second connection line third connection line

Claims

Claims Method for separating carbon dioxide from the ambient air (60), comprising the following steps: Supplying ambient air (60) into a system (10) for separating carbon dioxide from the ambient air (60), Directing ambient air (60) into a process chamber (12) having an adsorption unit (14), wherein the ambient air (60) is directed through the absorption unit (14) and carbon dioxide is substantially chemically bound in the adsorption unit (14), closing the process chamber (12) to prevent ambient air from flowing into the process chamber (12), evacuating the process chamber (12), Heating the adsorption unit (14), Releasing carbon dioxide from the adsorption unit (14), whereby a carbon dioxide concentration in the process chamber (12) increases, Introducing an inert gas (66) into the process chamber (12), wherein the introduction of the inert gas (66) causes further carbon dioxide to be discharged from the adsorption unit (14) and the carbon dioxide concentration in the process chamber (12) to be increased, Opening the process chamber (12) and extracting a carbon dioxide-inert gas mixture (74). A method for separating carbon dioxide from the ambient air (60) according to claim 1, characterized in that the inert gas (66) is water vapor (68), wherein, after the carbon dioxide-inert gas mixture (74) has been extracted, the water (76) contained in the water vapor (68) is separated by condensation. A method for separating carbon dioxide from the ambient air (60) according to claim 2, characterized in that the condensed water (76) is evaporated again and fed to the process chamber (12) as water vapor (68). A method for separating carbon dioxide from the ambient air (60) according to one of claims 1 to 3, characterized in that after heating the adsorption unit (14), a carbon dioxide-residual air gas mixture (78), which comprises the released carbon dioxide and the residual air present in the process chamber (12), is extracted and fed to an intermediate storage device (44). A method for separating carbon dioxide from the ambient air (60) according to claim 4, characterized in that the carbon dioxide-residual air gas mixture (78) is compressed to a pressure which is higher than an ambient pressure of the system (10). A method for separating carbon dioxide from the ambient air (60) according to claim 4 or 5, characterized in that the carbon dioxide-residual air gas mixture (78) is fed from the intermediate storage device (44) back to the process chamber (12).A method for separating carbon dioxide from the ambient air (60) according to claim 6, characterized in that a circulation of the carbon dioxide-residual air gas mixture (78) via the intermediate storage device (44) back into the process chamber (12) is repeated until a defined threshold value for the carbon dioxide concentration is reached. A method for separating carbon dioxide from the ambient air (60) according to one of claims 1 to 7, characterized in that during the evacuation of the process chamber (12), the pressure in the process chamber (12) is reduced to an absolute pressure of 300 mbar to 700 mbar. Method for separating carbon dioxide from the ambient air (60) according to one of claims 1 to 8, characterized in that the absorption unit (14) and / or a sorbent material (72) located in the absorption unit (14) are heated to a temperature of 80 °C - 110 °C to release the bound carbon dioxide.Plant (10) for separating carbon dioxide from the ambient air (60), wherein the plant (10) is designed to carry out a method according to one of claims 1 to 9.

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