Method for operating a co2 separation device

Abstract

The invention relates to a method (100) for operating a CO2 separation device having two separation chambers (16a, b), each having a CO2 separation means (18), for separating CO2 from a supplied gas flow (14a, b), in particular an air flow (14a, b) from an environment, wherein a heat transfer phase is carried out after the CO2 release mode of the relevant separation chamber (16a) has ended, during which phase - the gas flow (14a), in particular air flow (14a), is at least partially, in particular completely, initially passed through the relevant separation chamber (16a) in which the CO2 release mode has ended, in order to cool the heated CO2 separation means (18a) located therein for the subsequent CO2 separation mode, and - the heated gas flow (14c), in particular air flow (14c), is then passed through the other separation chamber (16b) which is in the CO2 separation mode, in order to preheat the CO2 separation means (18b) located therein for the subsequent CO2 release mode.

Description

[0001] Description

[0002] title

[0003] Method for operating a CO2-

[0004] State of the art

[0005] The invention relates to a method for operating a CO2 separation device with two separation chambers, each comprising a CO2 separation agent, for separating CO2 from a supplied gas stream, in particular an air stream from an environment, wherein one of the two separation chambers is operated in a CO2 release mode, in particular a desorption mode, at a reduced pressure and a temperature higher than that of the environment, and the other of the two separation chambers is operated in parallel with the supply of the gas stream, in particular an air stream, in a CO2 separation mode, in particular a sorption mode, at a pressure higher than that of the CO2 release mode, in particular ambient pressure, and at a temperature lower than that of the CO2 release mode, in particular ambient temperature, and a corresponding control unit.

[0006] The invention further relates to a CO2 separation device with two separation chambers, each containing a CO2 separation agent, for separating CO2 from a supplied gas stream, in particular an ambient air stream, wherein one of the two separation chambers can be operated in a CO2 release mode, in particular a desorption mode, at a reduced pressure and a temperature higher than that of the ambient air, and the other of the two separation chambers can be operated in parallel with the supply of the gas stream, in particular an air stream, in a CO2 separation mode, in particular a sorption mode, at a pressure higher than that of the CO2 release mode, in particular ambient pressure, and at a temperature lower than that of the CO2 release mode, in particular ambient temperature. To limit the warming of the Earth's atmosphere, so-called DAC (Direct Air Capture) systems are used to separate or remove CO2 (carbon dioxide) from the air.

[0007] Since the binding of CO2 and, if present, water to an adsorbent material depends on temperature, pressure, concentration, humidity, etc., all adsorption and desorption systems cyclically establish different conditions in order to separate CO2 through the resulting hysteresis. To adjust the desorption conditions, the adsorbent material must be temporarily sealed off from the environment and is therefore located in a chamber.

[0008] The chamber typically goes through the following steps cyclically:

[0009] (1) Adsorption of ambient air with the chamber open;

[0010] (2) Sealing the chamber and heating the adsorber material and the metallic chamber structure;

[0011] (3) Desorption of the CO2 and the bound water by supplying heat (e.g. in a range of greater than or equal to 90°C to less than or equal to 120°C, on average therefore approx. 105°C) under exclusion of oxygen to avoid degradation of the adsorber material, and at reduced pressure (e.g. in a range of greater than or equal to 50 mbar to less than or equal to 400 mbar) and pumping out the CO2 and the water vapor by means of a vacuum pump;

[0012] (4) active cooling of the adsorber material and the chamber and optionally drying of the adsorber material to below a critical temperature (e.g. in a range of greater than or equal to 50°C to less than or equal to 60°C) below which contact with ambient air no longer leads to increased degradation of the adsorber material by atmospheric oxygen;

[0013] (5) Opening the chamber to the environment, cooling to ambient temperature and thus resuming adsorption of CO2 and water from the ambient air.

[0014] In each cycle, the application of energy to heat the adsorber material from ambient temperature (annual average, e.g., 10°C in Hamburg) and the structure is unavoidable. This energy can be recovered through active cooling of the structure and the adsorber material if heating and cooling energy flows are appropriately coupled, e.g., via a heat pump and / or thermal storage. However, heat recovery between the technically achievable lowest temperature of 50°C through active cooling and the ambient temperature of 10°C is not possible.

[0015] This clearly shows that in discontinuous batch processes, on average, approximately half of the heating energy used is required to heat the adsorber material and the housing structure, and the other half is needed for desorption. Therefore, due to the achievable active lower cooling temperature (50 °C - 10 °C) / (105 °C - 10 °C) = 42% of the heating energy, or approximately 21% of the heating energy used, is lost. At lower ambient temperatures, e.g., in Nordic countries or during winter, the losses are even higher. While the temperature of active cooling can be further reduced with cooling coils, the installation costs and the material requirements for the piping can be considerable, and heat recovery via heat exchangers is also associated with losses.

[0016] WO2021259760 therefore describes that the cooling and drying of the adsorber material can also be carried out by applying negative pressure, since the required heat of vaporization cools the material.

[0017] WO 2020 / 212146 A1 discloses a DAC (Direct Air Capture) system with a container solution, wherein six separation chambers are arranged in series and can be operated in parallel. The containers can either be coupled together and fed to a vacuum pump for desorption or each can be connected to its own vacuum pump.

[0018] WO 2021 / 239747 A1 discloses a process for the adsorption and desorption of a sorbent used in cyclic adsorption-desorption for capturing CO2 directly from atmospheric air or highly dilute sources. In this process, after sealing the adsorption chamber, water vapor is injected to displace residual oxygen, which would lead to degradation of the adsorbent material at elevated temperatures.

[0019] Disclosure of the invention The subject matter of the present invention is a method according to the type described in the introduction, wherein a heat transfer phase is provided after the end of the CO2 release mode of the respective separation chamber, during which

[0020] - the gas stream, in particular the air stream, is at least partially, in particular completely, first directed through the respective separation chamber in which the CO2 release mode was terminated, in order to cool the heated CO2 separation agent contained therein for the subsequent CO2 separation mode, and

[0021] - the heated gas stream, in particular air stream, is then passed through the other separation chamber, which is in CO2 separation mode, in order to preheat the CO2 separation agent located therein for the subsequent CO2 release mode.

[0022] The present invention further relates to a control unit which is configured to execute and / or control the steps of the method described above.

[0023] The present invention also relates to a CO2 separation device of the type described in the introduction, wherein the two separation chambers can be fluidically connected and / or linked to each other for heat transfer, in particular by means of a connecting channel, such that

[0024] - the gas flow, in particular air flow, is at least partially, in particular completely, initially pass through a separation chamber in order to cool the heated CO2 separation agent located therein, and

[0025] - subsequently, the heated gas stream, in particular air stream, is directed through the other separation chamber in order to preheat the CO2 separation agent located therein for the subsequent CO2 release mode.

[0026] According to the invention, a heat transfer phase is provided after the CO2 release mode of the respective separation chamber has ended. During the heat transfer phase, the gas flow, in particular the air flow, is first passed at least partially, and in particular completely, through the respective separation chamber in which the CO2 release mode has ended, in order to cool the heated CO2 separation agent located therein for the subsequent CO2 separation mode. Subsequently, the heated gas flow, in particular the air flow, is passed through the other separation chamber, which is in the CO2 separation mode, in order to preheat the CO2 separation agent located therein for the subsequent CO2 release mode.

[0027] Similarly, the two separation chambers for heat transfer can be fluidically connected and / or linked to each other, in particular by means of a connecting channel, such that the gas flow, in particular air flow, can at least partially, in particular completely, first be conducted through one separation chamber in order to cool the heated CO2 separation agent located in it, and subsequently the heated gas flow, in particular air flow, can be conducted through the other separation chamber in order to preheat the CO2 separation agent located in it for the subsequent CO2 release mode.

[0028] In other words, the gas or air flow that is actually directed "directly" into the separation chamber, which is in CO2 separation mode, is first guided or redirected through the other, heated separation chamber during the heat transfer phase, so that it enters the cooler separation chamber preheated.

[0029] The core of the invention lies in cooling the separation chamber, which is heated / warmer by the CO2 release mode and must be cooled down for the subsequent CO2 separation mode, by means of the CO2-rich cold / colder gas or air stream, and in heating the other cold / colder separation chamber, which must be heated for the subsequent CO2 release mode, by means of the CO2-rich warm / heated gas or air stream.

[0030] This allows the heat generated during heating to be recovered, making CO2 separation more energy-efficient. This results in significant energy savings, particularly at low ambient temperatures of, for example, 20°C or lower. The supplied airflow preferably consists of cold ambient air, i.e., air with a temperature of 20°C or lower.

[0031] It is advantageous if the heat transfer phase is only started, or as soon as it is started, when the temperature of the CO2 separation agent in the separation chamber, in which the CO2 release mode has ended, falls below a critical temperature. It is particularly advantageous if, after the CO2 release mode of the respective separation chamber has ended and before the heat transfer phase begins, the CO2 separation agent is first actively cooled under negative pressure until it is below the critical temperature. In other words, if, for example, the critical temperatures are 50 °C or higher, the respective separation chamber remains sealed from the environment until the temperature of the CO2 separation agent in the separation chamber has dropped from, for example, 105 °C to 50 °C after the desorption process.

[0032] This measure maximizes the recovered heating energy without causing chemical degradation of the CO2 separation agent.

[0033] It is also advantageous if, during the heat transfer phase

[0034] - an inlet channel of the separation chamber, in which the CO2 release mode has ended, is at least partially, in particular completely, opened to direct the gas flow through it, and

[0035] - a connecting channel between the two separation chambers is opened at least partially, in particular completely, to allow the heated gas flow to pass through the other separation chamber.

[0036] It is advantageous if, furthermore, an outlet channel of the separation chamber in which the CO2 release mode has ended remains closed. In particular, it is also advantageous if an inlet channel of the other separation chamber, which is in CO2 separation mode, is at least partially, and preferably completely, closed. Preferably, an outlet channel of the other separation chamber also remains open. The channels are preferably opened and closed by means of valves in the valve unit.

[0037] Furthermore, it is advantageous if the gas flow is supplied by means of a blower unit during the heat transfer phase.

[0038] - the separation chamber in which the CO2 release mode was terminated, with the blower unit being located on the duct inlet side, and / or

[0039] - the separation chamber, which is in CO2 separation mode, with the blower unit located on the duct outlet side.

[0040] In this case, for example, the heat transfer phase can only be started by switching the valves, i.e. without interrupting the CO2 separation mode, when the blower unit is active or running.

[0041] It is also advantageous if the heat transfer phase is terminated when or after the CO2 separation agents of the two separation chambers have approximately the same temperature, i.e., the temperatures of the CO2 separation agents have equalized.

[0042] Furthermore, it is advantageous if, after the heat transfer phase has ended, the separation chamber in which the CO2 release mode has ended is switched to the CO2 separation mode and the other separation chamber, which is in the CO2 separation mode, is switched to the CO2 release mode.

[0043] The CO2 separation device is designed and configured to separate CO2 from a supplied gas stream, in particular an air stream, from an environment (the CO2 separation device). Within the scope of the present invention, the term "supply" or "supplied" primarily refers to an actively carried out or initiated, and thus technically controlled or regulated, supply of the gas or air stream by means of a blower unit or fan unit of the CO2 separation device. However, the term "supply" or "supplied" can also encompass a passively carried out or initiated supply of the gas or air stream without departing from the scope of the present invention. Consequently, the air stream can be supplied in any manner, e.g., naturally (as wind).

[0044] The CO2 separation device has at least two separation chambers. Preferably, the CO2 separation device has a plurality of separation chambers, which can be arranged adjacent to one another and / or side by side, or, if installed separately, fluidically connected to each other. The separation chambers are operated individually or in groups in parallel in a CO2 release mode and a CO2 separation mode, or can be operated individually or in groups in parallel in a CO2 release mode and a CO2 separation mode. The CO2 release mode and the CO2 separation mode are repeated cyclically. The basic operating principle of the CO2 separation device can be analogous, for example, to that of the aforementioned WO 2020 / 212146 A1.

[0045] In other words, if one of the separation chambers or group of separation chambers is operating in CO2 separation mode, the other of the two separation chambers or group of separation chambers is operating, or can be operated, in CO2 release mode, and vice versa. However, there can also be intermediate phases in which the separation chambers are operating, or can be operated, in the same mode.

[0046] The CO2 release process is carried out under reduced pressure and at a temperature higher than ambient. Accordingly, the CO2 release process is preferably carried out using a pump unit or vacuum unit to release CO2 bound in the CO2 separation medium, which was previously bound as a result of a CO2 separation process, in particular a sorption process. The CO2 is, understandably, temporarily bound. Within the scope of the present invention, the term "release" encompasses any meaningful method of releasing or expelling CO2 (carbon dioxide) from the CO2 separation medium, wherein a dissolution and / or release and / or discharge of CO2 molecules from the CO2 separation medium occurs. In this process, the CO2 is released or dissolved from the CO2 separation medium, particularly by introducing energy or heat into it.

[0047] The CO2 release mode is preferably a desorption mode. Accordingly, the release of CO2 can be achieved in particular by means of at least one of the following processes or combinations thereof:

[0048] - chemical desorption process

[0049] - physical desorption process

[0050] The CO2 separation process is carried out at a higher pressure, particularly ambient pressure, and a lower temperature, particularly ambient temperature, compared to the CO2 release process. Within the scope of the present invention, the term "separation" encompasses any meaningful method of separating or removing CO2 (carbon dioxide) from the gas or air stream, involving the binding, adhesion, storage, and / or absorption of CO2 molecules by a CO2 separation agent.

[0051] The CO2 separation mode is preferably a sorption mode, which in particular comprises an adsorption process and / or an absorption process. Accordingly, the separation of the CO2 can be carried out in particular by means of at least one of the following processes or combinations thereof:

[0052] - chemical adsorption process

[0053] - physical adsorption process

[0054] - chemical absorption process

[0055] - physical absorption process

[0056] The CO2 separation device can include a valve unit with a plurality of valves, particularly controllable ones, for closing the separation chamber during the CO2 release phase. The valve unit can include an inlet valve located in an inlet channel for the supplied or drawn-in gas or air flow, configured to close the inlet channel and isolate the separation chamber upstream. The valve unit can also include an outlet valve located in an outlet channel for the CO2-reduced gas or air flow, configured to close the outlet channel and isolate the separation chamber downstream. Furthermore, the valve unit can include a CO2 discharge valve located in a CO2 discharge channel for removing separated CO2, configured to open the CO2 discharge channel in order to selectively discharge the separated / bound and re-released CO2 from the separation chamber.

[0057] Each of the at least two separation chambers contains a CO2 separation agent. The CO2 separation agent is designed to separate CO2 from a supplied gas or air stream. The CO2 separation agent is preferably solid. It can be, for example, particulate, fibrous, or mat-shaped. In particular, the CO2 separation agent can comprise a solid (appropriately functionalized) sorbent, such as an adsorbent and / or an absorbent. Accordingly, the CO2 separation agent can, for example, have a particulate, fibrous, or nonwoven solid as a support structure with a base material selected from the group consisting of: resins, polymers, ceramics, zeolites, silicates, organometallic compounds, organic materials such as cellulose or activated carbon, and combinations thereof.The base material can be specifically functionalized with amines, potassium carbonate, or other components designed to chemically or physically bind CO2. The CO2 separation agent can also be air-permeable.

[0058] The CO2 separation agent can comprise or be designed as a granular ion exchange resin. For example, the CO2 separation agent can comprise or consist of granular Lewatit VP OC 1065 or Zeolite X13.

[0059] The CO2 separation device may further comprise at least one of the following units:

[0060] - Blower unit, in particular with a large number of fans for supplying the gas or air flow;

[0061] - Steam generator for providing steam for the CO2 release mode or desorption mode;

[0062] - Inerting unit for supplying an inert gas stream, such as...

[0063] Nitrogen, oxygen-free air and / or water vapor to remove oxygen before the CO2 release mode or desorption mode to protect the CO2 combustion medium from chemical degradation;

[0064] - Heating unit for additional heating of the CO2 separation agent for the CO2 release mode or desorption mode;

[0065] - Cooling unit for additional cooling of the CO2 separation agent for the CO2 separation mode or sorption mode;

[0066] - Material conveying unit for conveying the CO2 separation agent through the separation chamber;

[0067] - Sensor unit for CO2 separation and CO2 release modes;

[0068] - Control unit for controlling and / or regulating the CO2 separation and CO2 release mode.

[0069] The control unit can be configured to be connected to other control units and / or a central control unit of the CO2 separation device or a higher-level system via wireless transmission such as WLAN, Bluetooth, Near-Field Communication, etc. It should be noted that the term "control" within the scope of this application also includes regulating the respective device and / or unit.

[0070] The CO2 separation device is preferably designed as a stationary unit. In particular, the CO2 separation device can be part of a building climate control system, especially integrated into a climate control system within a building. The separation chambers of the CO2 separation device can be integrated into the building's air conditioning circuit.

[0071] Drawings

[0072] The invention is explained in more detail below with reference to the accompanying drawings. These show:

[0073] Fig. 1 shows a basic structure of a CO2 separation device; and

[0074] Figs. 2a, b show schematic representations of two separation chambers before and during a heat transfer phase according to the invention. In the following description of preferred embodiments of the present invention, the same or similar reference numerals are used for the elements shown in the various figures, which have a similar effect, and a repeated description of the elements is omitted.

[0075] Fig. 1 shows a basic structure of a CO2 separation device, which is designated as a whole by reference numeral 10. The CO2 separation device 10 is designed to separate CO2 (carbon dioxide) from an air stream 14 supplied by a blower unit 12 by means of cyclically executable CO2 separation modes or CO2 sorption modes and CO2 release modes or CO2 desorption modes.

[0076] For this purpose, the CO2 separation device 10 has a separation chamber 16 for receiving a CO2 separation agent 18 or sorption agent 18. The separation chamber 16 has an inlet valve 20 on an inlet channel 22 for the aspirated airflow 14, which is configured to close the inlet channel 22 and isolate the separation chamber 16 upstream. The separation chamber 16 also has an outlet valve 24 on an outlet channel 26 for the CO2-reduced airflow 14', which is configured to close the outlet channel 26 and isolate the separation chamber 16 downstream. The separation chamber 16 also has a CO2 valve 28, which is arranged in a CO2 discharge channel 30 and is designed to open the CO2 discharge channel 30 in order to discharge separated, i.e. sorbed and released, i.e. desorbed CO2 and, if applicable, water vapor from the separation chamber 16.

[0077] The CO2 separation device 10 also includes a heating and cooling unit 32 for heating and cooling the sorbent 18 and a steam generation unit 34 for providing steam for the CO2 release mode or desorption mode.

[0078] The separated CO2 and water vapor are pumped out of the separation chamber 16 by means of a pump unit 36 ​​or vacuum pump 36, with a water vapor condenser 38 being connected upstream of the pump unit 36 ​​or vacuum pump 36. The CO2 separation device 10 also has a control unit 40 for controlling the CO2 separation device 10 or the CO2 separation modes and CO2 release modes.

[0079] Figures 2a and 2b show schematic representations of two separation chambers 16a and 16b. These two separation chambers are part of a CO2 separation device, functioning analogously to the CO2 separation device 10 shown in Figure 1, for separating CO2 from an incoming air stream 14a and 14b. Accordingly, each of the two separation chambers 16a and 16b contains a CO2 separation agent 18a and 18b.

[0080] The two separation chambers 16a, b can be operated in parallel and cyclically in a CO2 release mode, in particular desorption mode and a CO2 separation mode, in particular sorption mode.

[0081] Fig. 2a shows a state prior to a heat transfer phase according to the invention, during which one of the two separation chambers 16a is operated in the CO2 release mode, in particular desorption mode, at a reduced pressure and a temperature higher than ambient, and the other of the two separation chambers 16b is operated in parallel with the supply of the airflow 14b in the CO2 separation mode, in particular sorption mode, at a pressure higher than ambient pressure and a temperature lower than ambient temperature compared to the CO2 release mode.

[0082] Fig. 2b shows a state during a heat transfer phase according to the invention, which is carried out after the CO2 release mode of the separation chamber 16a from Fig. 2a has ended. Here, the airflow 14a is first passed through the separation chamber 16a, in which the CO2 release mode has ended, in order to cool the heated CO2 separation agent 18a located therein for the subsequent CO2 separation mode, and then the heated airflow 14c is passed by means of a connecting channel 42 through the other separation chamber 16b, which is in the CO2 separation mode, in order to preheat the CO2 separation agent 18b located therein for the subsequent CO2 release mode.

[0083] Preferably, the CO2 separation agent 18a is actively cooled under negative pressure to below a temperature critical for the separation agent 18a after the CO2 release mode of the respective separation chamber 16a has ended and before the start of the heat transfer phase.

[0084] As can be seen from a comparison of Figs. 2a and 2b, during the heat transfer phase, the inlet channel 22a of the separation chamber 16a, in which the CO2 release mode has ended, is opened to allow the gas flow 14a to pass through it, and the connecting channel 42 between the two separation chambers 16a and 16b is also opened to allow the heated gas flow 14c to pass through the other separation chamber 16b. The outlet channel 26a of separation chamber 16a remains closed. Furthermore, the inlet channel 22b of the other separation chamber 16b, which is in CO2 separation mode, is closed, while the outlet channel 26b remains open.

[0085] As can also be seen from Fig. 2b, during the heat transfer phase the gas flow 14a is supplied to the separation chamber 16b by means of the blower unit 12b arranged on the channel outlet side.

[0086] The heat transfer phase is terminated when or after the CO2 separation media 18a, b of the two separation chambers 16a, b have approximately the same temperature. After the heat transfer phase has ended, the separation chamber 16a, in which the CO2 release mode has ended, is switched to the CO2 separation mode, and the other separation chamber 16b, which is in the CO2 separation mode, is switched to the CO2 release mode.

Claims

Claims 1. Method (100) for operating a CO2 separation device (10) with two separation chambers (16a, b) each comprising a CO2 separation agent (18a, b) for separating CO2 from a supplied gas stream (14a, b), in particular an air stream (14a, b) from an environment, wherein - one of the two separation chambers (16a) in a CO2 release mode, in particular desorption mode, under reduced pressure and at a temperature higher than ambient, and - the other of the two separation chambers (16b) is operated in parallel with the supply of the gas flow (14b), in particular air flow (14b), in a CO2 separation mode, in particular sorption mode, at a pressure increased compared to the CO2 release mode, in particular ambient pressure, and at a temperature reduced compared to the CO2 release mode, in particular ambient temperature, characterized by a Heat transfer phase after termination of the CO2 release mode of the respective separation chamber (16a), during the - the gas stream (14a), in particular the air stream (14a), is at least partially, in particular completely, first directed through the respective separation chamber (16a) in which the CO2 release mode was terminated, in order to cool the heated CO2 separation agent (18a) located therein for the subsequent CO2 separation mode, and - the heated gas stream (14c), in particular air stream (14c), is then passed through the other separation chamber (16b), which is in CO2 separation mode, in order to preheat the CO2 separation agent (18b) located therein for the subsequent CO2 release mode.

2. Method (100) according to claim 1, characterized in that the heat transfer phase is only started when the temperature of the in this CO2 separation agent (18a) is below a critical temperature for this agent.

3. Method (100) according to claim 2, characterized in that the CO2 separation agent (18a) is actively cooled under negative pressure to below the critical temperature after the CO2 release mode of the respective separation chamber (16a) has ended and before the start of the heat transfer phase.

4. Method (100) according to one of the preceding claims, characterized in that during the heat transfer phase - an inlet channel (22a) of the separation chamber (16a), in which the CO2 release mode was terminated, is at least partially, in particular completely, opened to allow the gas flow (14a) to pass through it, and - a connecting channel (42) between the two separation chambers (16a, b) is opened at least partially, in particular completely, to allow the heated gas flow (14c) to pass through the other separation chamber (16b).

5. Method (100) according to claim 4, characterized in that furthermore an outlet channel (26a) of the separation chamber (16a) in which the CO2 release mode was terminated remains closed.

6. Method (100) according to claim 4 or 5, characterized in that an inlet channel (22b) of the other separation chamber (16b), which is in CO2 separation mode, is at least partially, in particular completely, closed.

7. Method (100) according to claim 6, characterized in that furthermore an outlet channel (26b) of the other separation chamber (16b) remains open.

8. Method (100) according to one of the preceding claims, characterized in that during the heat transfer phase the supply of the gas flow (14a) is by means of - a blower unit of the separation chamber (16a) in which the CO2 release mode was terminated, wherein the blower unit is arranged on the duct inlet side, and / or - a blower unit (12b) of the separation chamber (16b), which is in CO2 separation mode, wherein the blower unit (16b) is arranged on the duct outlet side.

9. Method (100) according to one of the preceding claims, characterized in that the heat transfer phase is terminated when or after the CO2 separation agents (18a, b) of the two separation chambers (16a, b) have approximately the same temperature.

10. Method (100) according to one of the preceding claims, characterized in that after completion of the heat transfer phase, the separation chamber (16a) in which the CO2 release mode was terminated is switched to the CO2 separation mode and the other separation chamber (16b) which is in the CO2 separation mode is switched to the CO2 release mode.

11. Control unit configured to execute and / or control the steps of the procedure according to any of the preceding claims.

12. CO2 separation device (10) with two separation chambers (16a, b) each comprising a CO2 separation agent (18a, b) for separating CO2 from a supplied gas stream (14a, b), in particular an air stream (14a, b) from an environment, wherein - one of the two separation chambers (16a) in a CO2 release mode, in particular desorption mode, under reduced pressure and at a temperature higher than ambient, and - the other of the two separation chambers (16b) by supplying the gas flow (14b), in particular air flow (14b) in a CO2 separation mode, in particular sorption mode, at a pressure increased compared to the CO2 release mode, in particular ambient pressure and at a temperature reduced compared to the CO2 release mode, in particular ambient temperature, are operable in parallel, characterized in that the two separation chambers (16a, b) are fluidically connectable and / or connected to each other for heat transfer, in particular by means of a connecting channel (42), such that - the gas flow (14a), in particular air flow (14a), is at least partially, in particular completely, firstly passable through one separation chamber (16a) in order to cool the heated CO2 separation agent (18a) located therein, and - subsequently the heated gas stream (14c), in particular air stream (14c), is directed through the other separation chamber (16b) in order to preheat the CO2 separation agent (18) located therein for the subsequent CO2 release mode.

13. CO2 separation device according to claim 12 with a control unit according to claim 11.

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