Extraction reactor for extracting extraction gas from a gas mixture

Abstract

An extraction reactor for extracting extraction gas from a gas mixture comprises at least one extraction unit (28) through which the gas mixture can flow during adsorption operation of the extraction reactor, said extraction unit having at least one extraction chamber (32), wherein at least one extraction chamber (32) contains an adsorption granulate (30) with adsorption bodies (64) providing an adsorption surface for adsorbing extraction gas.

Description

[0001] 68671 P WO Purem GmbH / 3294 WO

[0002] - 1 -

[0003] Extraction reactor for extracting extraction gas from a gas mixture. Description

[0004] The present invention relates to an extraction reactor for extracting extraction gas, for example CO2 and / or water (H2O), from a gas mixture.

[0005] To prevent an excessive increase in the CO2 concentration in the Earth's atmosphere, which would exacerbate climate change, extensive measures are being taken to reduce CO2 emissions. However, these measures cannot reduce the existing CO2 concentration, i.e., remove CO2 already contained in the Earth's atmosphere. To achieve this, it is known, for example, to generate natural extraction gas storage through extensive reforestation or the restoration of peatlands.

[0006] German patent application DE 10 2024 120 259.9 discloses a device for extracting CO2 as an extraction gas from air as a gas mixture using a DAC (Direct Air Capture) process. In this device, an extraction reactor comprises a monolithic substrate with a plurality of channel-like cells through which the gas mixture flows. The substrate is coated with an adsorption material providing an adsorption surface. During the adsorption phase, as the gas mixture (i.e., air) flows through the cells, the extraction gas (CO2) contained within it is adsorbed onto the adsorption surface and thereby extracted from the gas mixture. In a subsequent desorption phase, the substrate, or rather its adsorption surface, is heated to a temperature above the desorption temperature of the extraction gas adsorbed onto the adsorption surface, and the CO2 released is directed into a CO2 storage tank.

[0007] The object of the present invention is to provide an extraction reactor for extracting extraction gas from a gas mixture, which, despite its compact design, has a high extraction capacity. 68671 P WO Purem GmbH / 3294 WO

[0008] - 2 -

[0009] According to the invention, this problem is solved by an extraction reactor for extracting extraction gas from a gas mixture, comprising at least one extraction unit through which the gas mixture flows in an adsorption operation of the extraction reactor, with at least one extraction chamber, wherein at least one extraction chamber contains an adsorption granulate with an adsorption surface for adsorbing adsorption bodies providing extraction gas.

[0010] In the extraction reactor constructed according to the invention, a substantially porous structure is formed by using a granular or powdery material through which the gas mixture flows and which adsorbs the extraction gas, which provides a large surface area that can interact with the gas mixture in relation to the claimed volume, thereby achieving a high storage capacity for the extraction gas to be extracted from the gas mixture.

[0011] In order to provide a defined volume for the adsorption granules, it is proposed that the at least one extraction unit comprises a first end wall and a second end wall arranged at a distance from the first end wall in the direction of an extraction unit longitudinal axis, wherein the first end wall and the second end wall define the at least one adsorption chamber in the axial direction, and that the at least one extraction unit comprises a circumferential wall defining the at least one adsorption chamber radially outwards.

[0012] To provide a structure through which the gas mixture can flow, a plurality of gas passage openings can be formed in each end wall of the first end wall and second end wall.

[0013] To ensure that the adsorption granules remain within the adsorption chamber bounded by at least one of the two end walls and the circumferential wall, and do not escape through the gas passage openings, it is proposed that the gas flow through each end wall be separated from the first end wall and the second end wall. 68671 P WO Purem GmbH / 3294 WO

[0014] - 3 - the openings are covered by a gas-permeable retaining layer. Such a gas-permeable retaining layer allows the passage of gaseous media, but not of the adsorption granules or the adsorption bodies thereof.

[0015] To provide this membrane-like structure which has a multitude of openings for gas passage, the holding layer of at least one, preferably each, end wall of the first end wall and second end wall can comprise a nonwoven material, woven material or stretch material, preferably made of metal.

[0016] A defined positioning of the retaining layers can be ensured, for example, by the fact that at least one end wall of the first end wall and the second end wall comprises two end wall plates, preferably constructed with metal material, which receive the retaining layer between them, or / and that at least one end wall of the first end wall and the second end wall comprises an end wall plate, preferably constructed with metal material, wherein the retaining layer is arranged on an inner side of one end wall plate facing the at least one extraction chamber.

[0017] In order to release extraction gas adsorbed onto the adsorption bodies of the adsorption granules in the extraction reactor, at least one electrically excitable heating element surrounded by the adsorption granules can be arranged in the at least one extraction chamber. Since the material providing the adsorption surface in the extraction reactor constructed according to the invention is granular or powdery, it can completely embed the at least one electrically excitable heating element, thus achieving efficient heat transfer between the at least one heating element and the adsorption granules.

[0018] To provide a large heat transfer surface available for thermal interaction with the adsorption granules, it is proposed that the at least one heating element comprise a heating conductor constructed from ribbon-like flat material, with narrow sides spaced apart from each other along the longitudinal axis of the extraction unit and broad sides spaced apart from each other transversely to the longitudinal axis of the extraction unit. 68671 P WO Purem GmbH / 3294 WO

[0019] - 4 -

[0020] For efficient and uniform heat transfer to the adsorption granules throughout the entire volume of the at least one extraction chamber, the at least one heating element in the at least one extraction chamber can be arranged in a winding manner.

[0021] For this purpose, for example, the at least one heating element can comprise a plurality of meander coil fields, each with meander coil sections arranged essentially parallel to each other and / or extending essentially in a straight line, and meander connecting sections directly adjacent to each other.

[0022] In order to achieve a defined positioning of the at least one heating element in the at least one extraction chamber, it can be electrically insulated by a plurality of support elements on at least one end wall between the first end wall and the second end wall.

[0023] The support elements can also be used to maintain the holding position on the inside of one end wall plate if the associated end wall is formed with only a single end wall plate.

[0024] At least one connection element can be provided on the perimeter wall to establish an electrically conductive connection with the at least one heating element.

[0025] To achieve the adsorption of CO2 as an extraction gas in the extraction reactor according to the invention for carrying out a DAC (Direct Air Capture) process, with which CO2 is to be extracted from air, the adsorption granules arranged in at least one extraction chamber can comprise adsorption bodies constructed with CO2 adsorption material, preferably zeolite material or metal-organic material, such as MOF CALF-20, in at least one extraction unit. Such CC adsorption material, such as zeolite, has 68671 P WO Purem GmbH / 3294 WO

[0026] - 5 - exhibits high CO2 selectivity and thus enables efficient extraction of CO2 from air.

[0027] Furthermore, it can be advantageous if, in at least one extraction unit, the adsorption granules arranged in at least one extraction chamber comprise adsorption bodies composed of FW adsorption material, preferably silica gel (silica, silicon dioxide) or alumina (aluminum oxide). By using such an H₂O (water) adsorption material, water is, for example, removed from the air before CO₂ extraction, so that the adsorption of water onto CC adsorption material intended for CO₂ adsorption can be largely prevented.

[0028] In order to achieve a large adsorption surface area on the one hand, but also to ensure that the adsorption granules have a sufficiently large pore volume for the gas mixture to flow through, it is proposed that in at least one, preferably each, extraction unit the adsorption granules arranged in at least one, preferably each, extraction chamber comprise adsorption bodies with a substantially spherical shape and / or with an average size in the range of 1 mm to 3 mm.

[0029] The invention further relates to a device for extracting extraction gas from a gas mixture, comprising at least one extraction reactor constructed according to the invention.

[0030] The present invention is described in detail below with reference to the accompanying figures. These show:

[0031] Fig. 1 shows a device for extracting extraction gas from a gas mixture in principle;

[0032] Fig. 2 a perspective partial longitudinal section view of an extraction unit of an extraction reactor; 68671 P WO Purem GmbH / 3294 WO

[0033] - 6 -

[0034] Fig. 3 shows a perspective view of a heating element constructed with flat strip material of the extraction unit of Fig. 2;

[0035] Fig. 4 shows a longitudinal sectional view of the extraction unit of Fig. 2.

[0036] In Fig. 1, a device for extracting extraction gas is generally designated by 10. In particular, this device 10 can be used to extract CO2 as an extraction gas from air as a gas mixture in a DAC process.

[0037] The device 10 comprises as its central component an extraction reactor 12, to which air L as a gas mixture is supplied in an adsorption operation via an air conveying arrangement 14, designed as a blower, compressor, or the like, through a first shut-off valve 16. In the manner described below, CO2 contained in the air, for example, is adsorbed as an extraction gas onto an adsorption surface in the adsorption reactor 12. The CO2-depleted residual air L' leaves the adsorption reactor 12 during the adsorption phase via a second shut-off valve 18. During the adsorption phase, a third shut-off valve 20 blocks a flow path leading to a CO2 storage tank 22.

[0038] Before transitioning to a desorption phase, any residual gas or air L' remaining in the extraction reactor 12 is evacuated to the environment. For this purpose, the two shut-off valves 16, 18 are moved to their closed position and the third shut-off valve 20 is moved to its open position, so that the CO2-depleted air L' extracted from the extraction reactor 12 can be discharged to the environment via an extraction reactor emptying pump 24 and a directional control valve 26. Once the extraction reactor 12 has been sufficiently evacuated, for example to a pressure of 100 mbar, the directional control valve 26 is positioned to establish a connection with the CO2 storage tank 22. This allows CO2 released in the extraction reactor 22 by raising the temperature of the adsorption surface to a value above the desorption temperature of CO2 to be conveyed into the CO2 storage tank 22. 68671 P WO Purem GmbH / 3294 WO

[0039] - 7 -

[0040] It should be noted that the embodiment of the device 10 described above with reference to Fig. 1 is only exemplary and may be designed differently in a variety of aspects, for example the number of extraction reactors 12, than shown, and may also be used for the extraction of extraction gases other than CO2 from gas mixtures other than air.

[0041] With reference to Figs. 2 and 4, the design of such an extraction reactor 12 or an extraction unit 28 for this is described below.

[0042] The extraction unit 28 comprises as its central component an extraction chamber 32 which is essentially completely filled with adsorption granules 30. The extraction chamber 32 is bounded along an extraction unit longitudinal axis A by two end walls 34, 36 which extend essentially orthogonally to the extraction unit longitudinal axis A. The first end wall 34 is positioned such that, with respect to a main flow direction of the air L flowing onto the extraction unit 28 and providing a gas mixture, it bounds the extraction chamber 32 in an upstream direction, while the second end wall 36 bounds the extraction chamber 32 in a downstream direction.

[0043] In the circumferential direction, or radially outward, the extraction chamber 32 is bounded by a circumferential wall, generally designated 38. The circumferential wall 38 can be provided in some sections by a tubular component 40, to which the downstream end wall 36 can be rigidly connected, for example, by welding. In a further, or the largest, circumferential region, the circumferential wall 38 can be provided by a circumferential wall section 42, which is positioned axially between the two end walls 34, 36.

[0044] The circumferential wall section 42 extends radially within and at a radial distance from the tubular component 40 along a radially outer end region of the two end walls 34, 36. In a circumferential region visible at the top of Fig. 2, the first end wall 34, which is also positioned at a radial distance from the tubular component 40, has a radially outwardly projecting section 44, which in the circumferential direction defines the extent of the circumferential wall 38. 68671 P WO Purem GmbH / 3294 WO

[0045] - 8 - encompasses, in which the circumferential wall 38 is formed by the tubular component 40 and not by the circumferential wall section 42. As indicated by a dashed line in Fig. 2, the circumferential wall section 42 follows the contour of the first end wall 34 projecting outwards at section 44 in its circumferential end regions. In the circumferential region in which the first end wall 34 has the radially outwardly projecting section 44, this radially outwardly projecting section 44 abuts the inner surface of another essentially tubular component 46, which, for example, provides a connecting flange 48 with which the extraction unit 28 can be connected to other components of the extraction reactor 12, for example, another extraction unit 28 or a conduit section serving to supply the air L.The tubular component 46 can be inserted into the tubular component 40 and firmly connected to it, for example, by welding. Another tubular component 50 is also inserted into the tubular component 40 on its downstream side with respect to the air flow L and fixed to it, for example, by welding. The tubular component 50 can also have a connecting flange 52 for connecting the extraction unit 28 to other components of the extraction reactor 12, for example, a duct section for draining the CO2-depleted residual air L' or another extraction unit 28.

[0046] In the circumferential region where the extraction chamber 32 is bordered radially outwards by the circumferential wall part 42, a radial space 54, visible in Fig. 4, is formed between the circumferential wall 38 and the tubular component 40, which is closed off in the downstream direction by the second end wall 36, so that no bypass flow path around the extraction chamber 32 exists in the extraction unit 28.

[0047] The first end wall 34, which is radially supported on the tubular component 46 only in a circumferential area, namely in the area of ​​the radially outwardly projecting section 44, is firmly connected to the second end wall 36 at a defined distance by a plurality of connecting elements 56, for example designed as screw bolts or the like. These connecting elements 56 also allow the circumferential wall section 42 to be firmly connected between the two end walls. 68671 P WO Purem GmbH / 3294 WO

[0048] - 9 - walls 34, 36. In addition, the circumferential wall section 42 can be firmly connected to the end walls 34, 36 by material bonding, for example by welding.

[0049] To allow air L as a gas mixture to enter the extraction chamber 32, a plurality of gas passage openings 58 are formed in the first end wall 34. These can be, for example, elongated and adjacent to one another or arranged in rows next to each other. The first end wall 34, oriented upstream, is formed with two end wall plates 60, 62, each of which has such gas passage openings 58 arranged in pairs. Since the gas passage openings 58 are dimensioned relatively large in order to achieve the lowest possible flow resistance for the air L introduced into the extraction chamber 32 as a gas mixture, there would, in principle, be the possibility that adsorption bodies 64 of the adsorption granules 30 could fall out of the extraction chamber 32 through the gas passage openings 58.To prevent this, a retaining layer 66 is positioned between the two end wall plates 60, 62, which provides a multitude of small openings or pores that are permeable to the gas mixture, i.e. the air L, but are dimensioned in such a way that the adsorption bodies 64 cannot move through them.

[0050] In the illustrated embodiment, the downstream second end wall 36 has a single end wall plate 68, by means of which the second end wall 36 is supported on the tubular component 40. A retaining layer 72 is arranged on an inner surface 70 of the end wall plate 68 of the second end wall 36 facing the extraction chamber 32. This retaining layer covers gas passage openings 74 formed in the second end wall 36 or the end wall plate 68 thereof. The gas passage openings 74 in the second end wall 36 can also be elongated and arranged in rows, either consecutively or side by side. The retaining layer 72 prevents the adsorption bodies 64 of the adsorption granules 30 from falling out of the extraction chamber 32 through the gas passage openings 74 of the second end wall 36. 68671 P WO Purem GmbH / 3294 WO

[0051] - 10 -

[0052] The retaining layers 66, 74 provided on the two end walls can be constructed with nonwoven material, woven material, stretch material or the like, preferably made of metal, to provide the function which allows the passage of gas but not the passage of adsorption bodies 64.

[0053] An electrically excitable heating element, generally designated 76, is arranged in the extraction chamber 32. As can be seen in Fig. 3, the heating element 76 has a heating conductor 78 constructed of flat ribbon material, which heats up due to its electrical resistance when an electrical voltage is applied. The heating conductor 78 is arranged in the extraction chamber 32 such that its narrow sides 80, 82 are spaced apart from each other in the direction of the longitudinal axis A of the extraction unit and are thus oriented upstream and downstream, respectively. The broad sides 84, 86 of the heating conductor 78 are spaced apart from each other transversely to the longitudinal axis A of the extraction unit and extend essentially between the two narrow sides 80, 82 in the direction of the longitudinal axis A of the extraction unit.

[0054] The heating conductor 78 is arranged in the extraction chamber 32 with a coiled structure. In particular, Fig. 2 shows that the heating conductor 78 is constructed with two adjacent meander coil fields 88, 90, each meander coil field comprising a plurality of approximately straight meander coil sections 92 and meander connecting sections 94 connecting these sections at their respective end regions. In one of their end regions, the two meander coil fields 88, 90 are connected to each other by a connecting part 96 of the heating conductor 78 or by integral design. In the respective other end region, the two meander coil fields 88, 90 each provide a connection section 98, 100. In these connection sections 98, 100, the meander coil fields 88, 90 can each be connected by means of a connection section 94 shown in Fig. 2.The 4 identifiable connection element 102 is connected to a voltage source, so that by applying an electrical voltage between the connection sections 98, 100 and the resulting electric current flowing through the heating conductor 78, the heating conductor 78 is heated. 68671 P WO Purem GmbH / 3294 WO.

[0055] - 11 -

[0056] For the defined positioning of the heating conductor 78 in the extraction chamber 32, a plurality of support elements 104 extending, for example, from the downstream second end wall 36, are provided. The heating element 76, or rather its heating conductor 78, which is generally made of metal and is not electrically insulated in its length within the extraction chamber 32, is electrically insulated from the end wall 36 by means of the support elements 104. For example, each support element 104 can comprise a support pin, for example made of metal, fixed to the end wall plate 68 and also penetrating the mounting surface 72, and a support sleeve, for example also made of metal, surrounding the support pin with intermediate insulating material, which is fixed to the heating conductor 78 by a material connection, for example soldering or welding.The support sleeves pushed onto the support pins also allow the holding position 72 to be held in place on the inside 70 of the end wall plate 68.

[0057] The adsorption granules 34, which essentially completely fill the extraction chamber 32, essentially completely surround the heating conductor 78, so that the latter is embedded in the adsorption granules. The heat generated in the heating conductor 78 when an electrical voltage is applied is distributed essentially uniformly throughout the volume of the extraction chamber 32, also due to the meandering structure of the heating conductor 78. This is further enhanced by the fact that the extraction chamber 32 is radially bounded to the outside by the circumferential wall section 42 over a substantial circumferential area, so that there is no excessively large distance between the outermost adsorption elements and the heating conductor 78.

[0058] In an adsorption process, air L, as a gas mixture, enters the extraction chamber 32 through the gas passage openings 58 of the first end wall 34 and the holding layer 66 arranged therein, flowing through the pore-like volume formed between the adsorption bodies 64. The air L comes into contact with essentially the entire surface of all adsorption bodies 64 of the adsorption granules 30, so that extraction gas contained in the air L, for example CO2, is absorbed at this surface provided by all the adsorption bodies 64. 68671 P WO Purem GmbH / 3294 WO

[0059] - 12 -

[0060] The sorption surface can be adsorbed. The residual air L', depleted of the extraction gas, for example CO2, leaves the extraction chamber 32 during adsorption operation through the gas passage openings 74 of the second end wall 36 and can be expelled to the environment via the second shut-off valve 18, as described above with reference to Fig. 1.

[0061] After the adsorption operation has ended and the shut-off valves 16, 18 have been placed in their closed position, any residual air L' still contained in the extraction chamber 32 or, more generally, in the extraction unit 28, can be extracted, for example, upstream of the first end wall 34 or / and downstream of the second end wall 36, and expelled to the environment by starting the extraction reactor emptying pump 24.

[0062] In a subsequent desorption operation, the adsorption granules 30 are heated to a temperature above the desorption temperature of the adsorbed extraction gas by applying an electrical voltage to the heating conductor 78. This causes the gas to be released from the surfaces of the adsorption bodies 64 and conveyed by the extraction reactor discharge pump 24 towards the storage tank 22. After the desorption phase has ended, for example, after a predetermined time or when the extraction gas concentration detected by a sensor falls below a predetermined threshold, the system can transition to the next adsorption phase to repeat the process of adsorption and subsequent desorption.

[0063] To provide a sufficiently large surface area for adsorption of the extraction gas by means of the adsorption granules 30, while also avoiding excessive obstruction of the flow path for the gas mixture, the adsorption bodies 64 can be constructed with a spherical shape and a size or mean diameter in the range of 1 mm to 3 mm. The material used to construct the adsorption bodies 64 can be selected depending on which gas is to be adsorbed as the extraction gas. For example, if CO2 is to be extracted from the air as the extraction gas, the adsorption bodies 64 can be coated throughout their entire volume or at least on their surface with zeolite material 68671 P WO Purem GmbH / 3294 WO

[0064] - 13 - or metal-organic material, such as MOF CALF-20. If, for example, water is to be removed from the air supplied as a gas mixture upstream of the adsorption of CO2 in a further extraction unit 28, the adsorption granules in such a further extraction unit 28 can comprise adsorption bodies 64 made of silica gel or alumina, which exhibit high selectivity and capacity for the adsorption of water. The CO2 also contained in the air as a gas mixture when flowing through such an upstream further extraction unit 28 is essentially not adsorbed on the adsorption bodies intended for the adsorption of water and thus passes with the onward airflow to the next extraction unit 28, in which an adsorption granule with adsorption bodies 64 made of a material with high selectivity and storage capacity for CO2 is arranged.

[0065] Finally, it should be noted that various structural modifications are possible to the previously described and illustrated structure of such an extraction unit 28 or of an extraction reactor 12 containing it. For example, the heating conductor 78 could be arranged in the extraction chamber 32 with a spiral structure, at least in some sections. Alternatively, the heating conductor 78, constructed with flat ribbon material, could have a length extending along the longitudinal axis A of the extraction unit such that it essentially covers the entire distance between the two end walls 34, 36. As can be seen particularly in Figures 2 and 3, the heating conductor 78 can have a corrugated structure to provide a larger surface area for thermal interaction with the adsorption granules 30.Alternatively, the heating conductor 78, constructed with flat ribbon material, can also be essentially flat.

[0066] Furthermore, the extraction unit 28 can, for example, comprise two extraction chambers arranged successively in the longitudinal axis A of the extraction unit and separated from each other by a gas-permeable partition, of which one extraction chamber – with respect to the flow direction in adsorption operation – is bounded upstream by the end wall 34 and one extraction chamber is bounded downstream by the end wall 36. 68671 P WO Purem GmbH / 3294 WO

[0067] - 14 - is limited downstream. In the upstream extraction chamber, for example, an adsorption granulate for the adsorption of water can be provided, and in the downstream extraction chamber, an adsorption granulate for the adsorption of CO2 can be arranged. In each of the two extraction chambers, with such a setup, at least one heating element, for example with the setup described above, can be provided for heating the adsorption granulate contained therein.

Claims

68671 P WO Purem GmbH / 3294 WO - 15 - Claims 1. Extraction reactor for extracting extraction gas from a gas mixture, comprising at least one extraction unit (28) through which the gas mixture (L) flows in an adsorption operation of the extraction reactor (12) and comprising at least one extraction chamber (32), wherein at least one extraction chamber (32) contains an adsorption granulate (30) with an adsorption surface for adsorbing adsorption bodies (64) providing extraction gas.

2. Extraction reactor according to claim 1, characterized in that the at least one extraction unit (28) comprises a first end wall (34) and a second end wall (36) arranged in the direction of an extraction unit longitudinal axis (A) at a distance from the first end wall (34), wherein the first end wall (34) and the second end wall (36) define the at least one adsorption chamber (32) in the axial direction, and that the at least one extraction unit (28) comprises a circumferential wall (38) defining the at least one adsorption chamber (32) radially outwards.

3. Extraction reactor according to claim 1 or 2, characterized in that a plurality of gas passage openings (58, 74) are formed in each end wall (34, 36) of the first end wall (34) and second end wall (36).

4. Extraction reactor according to claim 3, characterized in that the gas passage openings (58, 74) of each end wall (34, 36) of the first end wall (34) and second end wall (36) are covered by a gas-permeable retaining layer (66, 72).

5. Extraction reactor according to claim 4, characterized in that at least one, preferably each, end wall (34, 36) of first end wall (34) and second end wall (36) the 68671 P WO Purem GmbH / 3294 WO - 16 - The holding layer (66, 72) comprises a nonwoven material, woven material, or stretch material, preferably made of metal.

6. Extraction reactor according to claim 4 or 5, characterized in that at least one end wall (34) of first end wall (34) and second end wall (36) comprises two end wall plates (60, 62) which receive the retaining position (66) between them and which are preferably constructed with metal material, and / or that at least one end wall (36) of first end wall (34) and second end wall (36) comprises an end wall plate (68) which is preferably constructed with metal material, wherein the retaining position (72) is arranged on an inner side (70) of one end wall plate (68) facing the at least one extraction chamber (32).

7. Extraction reactor according to one of claims 1-6, characterized in that at least one electrically excitable heating element (76) surrounded by the adsorption granules (30) is arranged in the at least one extraction chamber (32).

8. Extraction reactor according to claim 7, characterized in that the at least one heating element (76) comprises a heating conductor (78) constructed with flat ribbon material, with narrow sides (80, 82) arranged at a distance from each other in the direction of the longitudinal axis (A) of the extraction unit and wide sides (84, 86) arranged at a distance from each other transversely to the longitudinal axis (A) of the extraction unit.

9. Extraction reactor according to claim 7 or 8, characterized in that the at least one heating element (76) is arranged in a coiling manner in the at least one extraction chamber (32).

10. Extraction reactor according to claim 9, characterized in that the at least one heating element (76) has a plurality of meandering coil fields (88, 90) each with a mutually oriented 68671 P WO Purem GmbH / 3294 WO - 17 - essentially parallel and / or essentially straight meander coil sections (92) and meander connecting sections (94) that connect adjacent meander coil sections (92).

11. Extraction reactor according to one of claims 7-10, characterized in that the at least one heating element (76) is electrically insulated by a plurality of support elements (104) on at least one end wall (36) of first end wall (34) and second end wall (36).

12. Extraction reactor according to claim 11, insofar as it relates back to claim 6, characterized in that the holding position (72) is held by the support elements (104) on the inside (70) of one end wall (68).

13. Extraction reactor according to one of claims 7-10, insofar as it refers back to claim 2, characterized in that at least one connection element (102) is provided on the circumferential wall (38) for establishing an electrically conductive connection with the at least one heating element (76).

14. Extraction reactor according to one of claims 1-13, characterized in that in at least one extraction unit (28) the adsorption granules (30) arranged in at least one extraction chamber (32) comprise adsorption bodies (64) composed of CO2 adsorption material, preferably zeolite material or organometallic material, and / or that in at least one extraction unit (28) the adsorption granules (30) arranged in at least one extraction chamber (32) comprise adsorption bodies (64) composed of H2O adsorption material, preferably silica gel or alumina.

15. Extraction reactor according to one of claims 1-14, 68671 P WO Purem GmbH / 3294 WO - 18 - characterized in that in at least one, preferably each, extraction unit (28) the adsorption granules (30) arranged in at least one, preferably each, extraction chamber (32) comprise adsorption bodies (64) having a substantially spherical shape and / or having an average size in the range of 1 mm to 3 mm.

16. Device for extracting extraction gas from a gas mixture, comprising at least one extraction reactor (12) according to any one of claims 1-15.

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