Method for producing a sorbent for the sorption of co2

Abstract

The invention relates to a method for producing a sorbent, the method comprising the steps of: reacting at least one monomer of an ionic liquid with at least one crosslinker to produce a polymer; modifying the polymer to produce an amino-group-containing polymer, wherein the at least one crosslinker is selected from the group consisting of acrylate, acrylamide, R1-[CH=CH2]n, where R1 = alkyl, aryl, n≥2, and derivatives thereof. The invention also relates to a sorbent, to the use of the sorbent, and to a method for the sorption of CO2.

Description

[0001] Description

[0002] “Process for producing a sorbent for sorption of CO2”

[0003] The invention relates to a process for producing a sorbent, a sorbent, the use of the sorbent for sorbing CO2 and a process for sorbing CO2.

[0004] Various technologies can be used for carbon dioxide capture. These can be roughly categorized by their mode of operation. Carbon dioxide removal is differentiated between point sources from industrial processes and ambient air.

[0005] In the Direct Air Capture (DAC) process for carbon dioxide extraction, ambient air is passed through a filter medium (sorbent), which removes the CO2 from the gas mixture. The filter media used and the associated process phases can vary considerably. For CO2 capture, approaches using solvents, filter membranes, organic and inorganic, chemical, and physical sorbents, as well as hybrid sorbents, are being pursued. Controllable parameters such as time, air mass flow, air pressure, temperature, humidity, etc., increase the efficiency and effectiveness of the systems.

[0006] The selective uptake of substances by other substances is collectively referred to as sorption. A distinction is made between uptake within a solid body (absorption) and deposition on the surface (adsorption). If the described effects of the sorbing substance (sorbent or sorbent) occur simultaneously and overlap, the umbrella term "sorption" is also used. Conversely, the detachment of adsorbed substances from surfaces is called desorption.

[0007] In principle, two different mechanisms can be identified for the absorption of gases by solid sorbents. In chemisorption, the sorbent—the substance to be sorbed—adheres to the sorbent through chemical bonding. Activation energy, which is possible over a wide temperature range, allows binding to occur at specific locations within a monolayer. The chemical bonding process can proceed at different speeds and is often reversible.

[0008] Sorbents based on divinylbenzene are disclosed, among others, in He et al., ACS Sustainable Chem. Eng. 2002, 10, 2556-2568, and Guo et al., ACS Appl. Mater. Interfaces 2016, 8, 12812-12821. Sorbents based on ionic liquids are described, among others, in Kessaratikoon et al., The Journal of Organic Chemistry 2023 88 (8), 4894-4924.

[0009] Copolymers comprising vinylpyridines and 1,3,5-triacryloylhexahydro-1,3,5-triazine are disclosed, inter alia, in DE2041915 A1.

[0010] The object of the present invention is to provide a process for producing a sorbent, a sorbent, the use of a sorbent and a process for sorbing CO2, which at least partially overcomes the disadvantages of the prior art.

[0011] This object is achieved by the inventive method for producing a sorbent according to claim 1, a sorbent according to claim 8, a sorbent according to claim 9, the use of at least one sorbent and the method for sorbing CO2 according to claim 13.

[0012] Further advantageous embodiments of the invention emerge from the subclaims and the following description of preferred embodiments of the present invention.

[0013] A process according to the invention for producing a sorbent comprising the steps:

[0014] - reacting at least one monomer of an ionic liquid with at least one crosslinker to produce a polymer,

[0015] - Modification of the polymer to produce a polymer containing amino groups, wherein the at least one crosslinker is selected from the group consisting of acrylate, acrylamide, R 1 -[CH=CH2]n with R 1 = Alkyl, aryl, n>2, and derivatives thereof.

[0016] A process according to the invention comprises the step of reacting at least one monomer of an ionic liquid with at least one crosslinker to produce a polymer. The at least one monomer can be the same molecule or different molecules.

[0017] An ionic liquid is a salt compound with a low melting point. Ionic liquids typically have a melting point of <100°C. In some embodiments, an ionic liquid can also contain monomeric organic salts with a melting point in the range of >100°C to <150°C. Examples of cations of ionic liquids are imidazolium, pyridinium, ammonium, phosphonium, and derivatives thereof. The anions can be halides, tetrafluoroborates, hexafluorophosphates, trifluoroacetates, triflates, tosylates, etc.

[0018] In one embodiment, the at least one monomer is an imidazolium derivative. The derivative may be a salt.

[0019] Preferably, the at least one monomer comprises an imidazolium derivative comprising at least one ammonium group (NHa +). Organic and inorganic anions are conceivable as counteranions. The organic anions can be alkoxides (e.g., methanolate, ethanolate, etc.), alkylsulfonates (e.g., methylsulfonate, ethylsulfonate, etc.). The inorganic anions can be, among others, halides (e.g., fluorides, chlorides, bromides, iodides, etc.), hydroxyl, azides (e.g., methyl azide, ethyl azide, etc.), silyl, etc.).

[0020] The anions are preferably inorganic anions. Halides (e.g., bromide) are particularly preferred.

[0021] In a further embodiment, the at least one monomer is a monomer of formula 1:

[0022] Formula 1 , where R 2 is selected from the group consisting of alkyl, alkenyl and aryl and X is a

[0023] Halogen is. R 2 can be a Ci-Cis-alkyl. For example, R 2be ethyl, propyl, or octyl. X' can be selected from fluoride, bromide, and chloride. Preferably, X' is bromide.

[0024] In alternative embodiments, X' in Formula 1 may also be another anion as described herein.

[0025] In the process according to the invention, the at least one monomer is reacted with at least one crosslinker to produce a polymer.

[0026] A crosslinker is a molecule with at least two functional groups that can react with at least one monomer to form a network of molecules. The at least one crosslinker is selected from the group consisting of acrylate, acrylamide, R 1 -[CH=CH2]n with R 1 = Alkyl, aryl, n>2, and derivatives thereof.

[0027] The crosslinker can affect the polymerization yield as well as the polymer structure. Furthermore, the crosslinker can affect the sorption properties of the sorbent. For example, if the sorbent is used to sorb CO2, the crosslinker can influence the sorption of CO2.

[0028] In one embodiment, the at least one crosslinker is R 1 - [CH=CH2]n with R 1 = Alkyl, aryl, n>2. The alkyl can be, for example, methyl, ethyl, or propyl.

[0029] In a further embodiment, the at least one crosslinker is an acrylamide.

[0030] In a preferred embodiment, the at least one crosslinker is a crosslinker of formula 2: Formula 2.

[0031] The crosslinker of formula 2 is 1,3,5-triacryloyl hexahydro-1,3,5-triazine. If a crosslinker of formula 2 is used to produce a sorbent for sorbing CO2, more CO2 can be sorbed by this crosslinker than, for example, when divinylbenzene (DVB) is used as the crosslinker.

[0032] The ratio between the at least one monomer and the at least one crosslinker may be 90:10-1:99, preferably 75:25-10:90, more preferably 50:50-25:75.

[0033] The reaction between the at least one monomer and the at least one crosslinker can be a polymerization reaction. The polymerization reaction can be a step polymerization, a coordinative chain polymerization, or a radical chain polymerization. It is preferably a radical chain polymerization.

[0034] The reaction between the at least one monomer and the at least one crosslinker preferably takes place in a suitable solvent. The solvent is preferably an organic solvent, a mixture of organic solvents, or a mixture of at least one organic solvent and water. For example, the solvent can be an alcohol (e.g., methanol, ethanol, etc.) or an acetate.

[0035] A process according to the invention further comprises the step of modifying the polymer to produce a polymer containing amino groups. The modification can be a suitable reaction by means of which a functional group can be formed from a salt. Preferably, an ammonium group (-NHa + ) to an amino group (-NH2).

[0036] In one embodiment, the modification of the polymer comprises treating the polymer with at least one base. The base can be an organic or an inorganic base. For example, the inorganic base can be KOH, NaOH, Ca(OH)2, or Mg(OH)2.

[0037] The modification preferably takes place in a specific ratio of the individual components. When treated with a base, the ratio of the polymer's ammonium group to the base's hydroxyl group can be in the range of 10:1-1:1, preferably in the range of 5:1-1:1, more preferably 1.5:1.

[0038] In a further embodiment, the modification of the polymer comprises treating the polymer with at least one base and an associated inorganic salt. The base can be an organic or an inorganic base. For example, the inorganic base can be KOH, NaOH, Ca(OH)2, or Mg(OH)2. The associated salt can be an alkali metal salt (e.g., NaCl, NaBr, KCl, KBr, CsCl, or CsBr) or an alkaline earth metal salt (e.g., MgBr2, MgCh, CaBr2, CaCh, FeCh, FeBr2, CuCh, CuBr2, AlCl3, AlBra, NiCh, or NiBra).

[0039] The modification preferably takes place in a specific ratio of the individual components. When treated with a base and the associated salt, the ratio of base to salt can be in the range of 1:10-1:1, preferably in the range of 1:5-1:1, more preferably in the range of 1:5:1-1:1.

[0040] The resulting polymer can be present in various modifications. The polymer can be in the form of a fine powder, which can be further processed by mechanical pressing into pellets (e.g., pellets with a diameter of 11 mm), preferably at 400 to 500 bar, more preferably 410 to 450 bar, e.g., at 413 bar. The pellets can be crushed and divided into particle batches of various sizes by sieving. The particles can, for example, have a diameter in the range of 1 to 5 mm, preferably in the range of 1 to 3 mm.

[0041] Furthermore, the present invention relates to a sorbent produced by a process according to the invention.

[0042] The present invention further relates to a sorbent comprising an amino group-containing polymer of the general formula 3, wherein

[0043] Formula 3, with Ri = C12-C18 alkyl, R2 = alkyl, alkenyl, aryl, cyclyl, n > 3, m > 1, o > 1, P^2,

[0044] X = CI, Br, I,

[0045] In one embodiment, the sorbent is a sorbent of the general formula 4, wherein

[0046] Formula 4, with Ri = C12-C18 alkyl,

[0047] R2 = alkyl, alkenyl, aryl, cyclyl, n > 3, m > 1, o > 1, P^2,

[0048] X = CI, Br, I, is.

[0049] In one embodiment, Ri in formula 4 is selected from the group consisting of ethyl, propyl and octyl.

[0050] In a further embodiment, R2 in formula 4 is selected from the group consisting of ethyl, propyl and triazine.

[0051] In another embodiment, X in formula 4 is Br.

[0052] In a preferred embodiment, Ri is ethyl, R2 is a triazine derivative and X is Br in formula 4. In a further embodiment, the sorbent is a sorbent of formula 5:

[0053] Formula 5, with n >= 3, m >= 1 , p > 1 , q > 1 , is.

[0054] Preferably, n = 3 to 10, m = 1 , p = 1 , q = 1 in formula 5.

[0055] Furthermore, the present invention relates to the use of at least one sorbent for the sorption of CO2. Sorption preferably occurs from a gaseous medium comprising CO2. The gaseous medium can be a point source, the atmosphere, or exhaust gases.

[0056] Preferably, a sorbent according to the invention is used in a direct air capture (DAC) process for the sorption of CO2.

[0057] Furthermore, the present invention relates to a process for the sorption of CO2 from a gaseous mixture comprising the step of bringing a gaseous mixture comprising CO2 into contact with at least one sorbent according to the invention.

[0058] The gaseous mixture can be a gaseous medium containing CO2. The gaseous medium can be a point source, atmosphere, or exhaust gases. The process for sorption of CO2 from a gaseous mixture can be a direct air capture (DAC) process.

[0059] It is conceivable to use a sorbent according to the invention in all areas where sorption, e.g., of CO2, is conceivable. For example, the sorbent can be used in plants and systems in which CO2 is to be sorbed. Use in vehicles, applications in vehicles, air conditioning systems (e.g., in vehicles and buildings), and in direct air capture systems is also conceivable.

[0060] Embodiments of the invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0061] Fig. 1 schematically shows a process for producing a sorbent,

[0062] Fig. 2 general scheme for the synthesis of ionic liquid monomers with different alkyl linkers linked to an ammonium halogen unit, Fig. 3 a general polymerization scheme,

[0063] Fig. 4 the reaction of an aminated monomer with divinylbenzene,

[0064] Fig. 5 the reaction of an aminated monomer with 1,3,5-triacryloylhexahydro-1,3,5-triazine,

[0065] Fig. 6 the modification of a polymer,

[0066] Fig. 7 shows a further modification of a polymer, and

[0067] Fig. 8a-8d show the H2O and CO2 uptake.

[0068] Fig. 1 schematically shows a method 100 according to the invention for producing a sorbent. First, in step 101, at least one monomer of an ionic liquid is mixed with at least one crosslinker, wherein the at least one crosslinker is selected from the group consisting of acrylate, acrylamide, R 1 -[CH=CH2]n with R 1 = alkyl, aryl, n>2, and derivatives thereof, to produce a polymer. In the further step 102, the polymer is modified to produce a polymer containing amino groups.

[0069] Fig. 2 shows a general reaction scheme for the synthesis of an ionic liquid monomer. An imidazolium derivative is reacted with an alkyl compound containing a terminal ammonium halogen radical. The R radical in the alkyl compound can be selected from alkyls having 2 to 18 carbon atoms. The reaction is preferably carried out at 80°C for 24 hours in acetonitrile and an inert gas atmosphere (e.g., N2). Fig. 3 shows an example of a general copolymerization scheme. An imidazolium derivative (R2 is preferably selected from methyl to octyl) is reacted with a vinyl derivative, where R2 is preferably 3 and p=1. By adding a radical initiator, such as AIBN, polymerization can be carried out at approximately 80°C in a solvent mixture under an inert gas atmosphere (e.g., N2) for 24 hours. In the resulting polymer, n can be > 3 and m > 1. The asterisks represent the polymer chain.

[0070] Fig. 4 shows another example of a copolymerization reaction. The aminated ionic liquid is reacted with divinylbenzene as a crosslinker, with the addition of AIBN as a radical initiator. The reaction takes place under an inert gas atmosphere (e.g., N2) in a solvent mixture at approximately 80°C for 24 hours. The indices can be n > 3, m > 1, and p > 1.

[0071] Fig. 5 shows another example of a copolymerization reaction. The aminated ionic liquid is reacted with 1,3,5-triacryloylhexahydro-1,3,5-triazine as a crosslinker with the addition of AIBN as a radical initiator. The reaction takes place under an inert gas atmosphere (e.g., N2) in a solvent mixture at approximately 80°C for 24 hours. The indices can be n > 3, m > 1, and p > 1.

[0072] Figure 6 shows an example of a modification of a polymer with an ammonium group to a polymer with an amino group. The ammonium-containing polymer is reacted with a combination of a base and an associated salt (e.g., NaOH / NaBr), a salt (e.g., NaBr), and water as a solvent. The indices n, m, and p can be n > 3, m > 1, and p > 1, respectively.

[0073] Figure 7 shows an example of a modification of a polymer with an ammonium group to a polymer with an amino group. The ammonium-containing polymer is reacted with a combination of a base and an associated salt (e.g., NaOH / NaBr), a salt (e.g., NaBr), and water as a solvent. The indices n, m, and p can be n > 3, m > 1, and p > 1, respectively.

[0074] Fig. 8a, 8b, and 8c show the water adsorption and CO2 adsorption of various materials as a function of time. Fig. 8a shows the water and CO2 adsorption of Najo A15 N (sorbent with triacrylamide as crosslinker and Br as anion). Fig. 8b shows the water and CO2 adsorption of Najo A20 N (sorbent with DVB as crosslinker and Br as anion). Fig. 8c shows the water and CO2 adsorption of Najo 3.0 (sorbent with triacrylamide as crosslinker and trifluorosilicic acid (TFSI) as anion). Fig. 8d shows the CO2 adsorption at different relative humidities.

[0075] Examples

[0076] 1. Monomer synthesis n-haloalkylamine hydrohalo-1-vinylimidazole (n = 2 to 18, halo / halogen: Br or CI).

[0077] Synthesis of aminated HX vinylalkylimidazolium halogen monomer ([AVIm3C]X.HX, where X is Br or CI (Fig. 2):

[0078] / V-Vinylimidazole (0.250 mol) and n-haloalkylamine hydrohalide (R = alkyl with 2 to 18 carbons) (0.250 mol) were dissolved in acetonitrile (250 mL). The solution was degassed and then stirred at 80 °C under nitrogen for 24 hours. After separation of the supernatant, the obtained solid was cooled with liquid nitrogen and then triturated and ground to obtain a fine powder. The latter was suspended in ethanol / H2O (100 / 10 mL / mL) and stirred overnight before filtering and subsequently washing with anhydrous ethanol to obtain a white powder. All organic phases were collected and evaporated in vacuo, then mixed with anhydrous ethanol (100 mL) and stirred overnight. The resulting white solid was filtered. The white solid products were combined and dried at 40 °C for 24 hours to achieve a yield of 65%.

[0079] Characterization: The chemical structures of the monomer products are confirmed by proton magnetic resonance spectroscopy. An example of a monomer prepared from 1-vinylimidazole and 3-bromopropylamine hydrobromide is presented here. 1 H NMR (500 MHz, D2O) δ (ppm) = 9.14 (s, 1H), 7.83 (s, 1H), 7.66 (s, 1H), 7.16 (q, 1H), 5.83 (dd, 2H), 5.46 (dd, 1H), 4.40 (t, 2H), 3.11 (m, 2H), 2.33 (q, 2H). No visible signal for NH3 + .

[0080] SEM: The bromide alkylamine salt is provided with the HBr-protonated amine to prevent intermolecular nucleophilic substitution, and monomer synthesis must be carried out without neutralization. The resulting aminated vinylimidazolium monomer is therefore protected with HBr, and neutralization in this step would also trigger intermolecular nucleophilic substitution, leaving it protonated for further polymerization. 2. Polymer Synthesis

[0081] Material: A crosslinker selected from divinylbenzene, 1,3,5-triacryloylhexahydro-1,3,5-triazine (98% purity, Merck), dipentaerythritol pentaacrylate, and pentaerythritol tetraacrylate. AIBN as a radical generator.

[0082] Copolymerization of any aminated ionic liquid monomer with a crosslinker (Fig. 3):

[0083] Typically, the aminated ionic liquid monomer (30 mmol) (Ri = ethyl to octyl, R2 = distance between the vinyl units, n = 3, 4, or 5) and the crosslinker (15, 30, or 60 mmol) were dissolved in 300 mL of a mixture of ethyl acetate, ethanol, and water (20 / 65 / 15 v% / v% / v%) and sparged with N2 for 15 minutes before heating to 80°C. After 20 minutes, a degassed solution of AIBN (0.59 g, 3.6 mmol) in 5 mL of ethyl acetate was added to the preheated monomer solution. The polymerization was carried out at 80°C for 24 hours, then filtered with a paper filter and washed with ethanol. The resulting powder was added to 200 mL of MilliQ water and stirred overnight. Finally, the powder is filtered and washed successively with MilliQ water (200 mL) and ethanol (200 mL) and then dried under vacuum at 40 °C for 24 hours.The samples were analyzed by CHN-Br elemental analysis to determine the amine composition, N2 adsorption at 77 K to determine the specific surface area (SSA) (BET model), and gravimetry to determine the yield.

[0084] Example 1 (Fig. 4): Divinylbenzene (DVB) as crosslinker (30 mmol) for the reaction and [AVIm3C]Br.HBr as aminated monomer.

[0085] Polymerization factor: Vinyl function (mol) / Initiator (mol) = (30+2*30) / 3.6 = 25. Concentration = 0.1 M for each monomer; the concentration can influence the specific surface area (SSA).

[0086] The results are based on seven experiments conducted by two people. (Mean + / - standard deviation)

[0087] Yield = 52.4 + / - 1 ,2 % (6.99 g) SSA = 141 ,9 + / - 252 m 2 / g [AVIm3C]Br.HBr content in the polymer = 28.5 + / - 1 ,9 mol%

[0088] Example 2 (Fig. 5): 1,3,5-Triacryloylhexahydro-1,3,5-triazine as crosslinker (30 mmol) for the reaction and [AVIm3C]Br.HBr as aminated monomer. Polymerization factor: vinyl function (mol) / initiator (mol) = (30 + 3 * 30) / 4.8 = 25

[0089] Concentration = 0.1 M for each monomer, the concentration may have an influence on the SSA.

[0090] The results are based on a test conducted by a member of staff. Yield = > 96% (16.99 g) SSA = 147.3 m 2 / G

[0091] [AVIm3C]Br.HBr content in the polymer = 47.5 mol% (50% based on yield)

[0092] Neutralization of the copolymer network with DVB (divinylbenzene) crosslinker: General procedure: The copolymer with a specific amount of amine groups is sequentially dispersed in an aqueous solution containing a specific amount of NaOH and NaBr. Each treatment lasted 24 hours, and the powder was filtered with a Buchner paper filter between each step. For final filtration, the powder was collected by filtration on a Buchner paper filter and washed with MilliQ water and then with ethanol before being dried under vacuum at 40°C for 24 hours to obtain a white powder.

[0093] Example 3 (Fig. 6): For copolymers with DVB crosslinker, where an IL (ionic liquid) / crosslinker ratio of 26 mol% / 74 mol% was determined by elemental analysis after polymerization. The sample was analyzed by CHN-Br elemental analysis to confirm neutralization.

[0094] The copolymer (38.3 mmol amine, 26.15 g) was sequentially dispersed in 315 mL of an aqueous solution of NaOH (2.3 equiv., 3.54 g, 88.5 mmol) / NaBr (4.6 equiv., 18.21 g, 177 mmol), 315 mL of NaBr (3.1 equiv., 12.14 g, 118 mmol), and finally 315 mL of MilliQ water. Each treatment lasted 24 hours, and the powder was filtered on a Buchner paper filter between each step. For final filtration, the powder was collected by Buchner filtration using a paper filter and washed with MilliQ water (300 ml) and then with ethanol (300 ml) before being dried under vacuum at 40 °C for 24 hours to obtain 23 g of white powder (99.8% yield).

[0095] Example 4 (Fig. 7): For copolymers with 1,3,5-triacryloylhexahydro-1,3,5-triazine crosslinker, where the IL / crosslinker ratio = 47.5 mol% / 52.5 mol%, elemental analysis was performed after polymerization. The sample was analyzed using CHN-Br analysis to confirm neutralization. Neutralization of the copolymer network with 1,3,5-triacryloylhexahydro-1,3,5-triazine crosslinker: The copolymer (26.8 mmol amine, 15.74 g) was dispersed in 310 mL of an aqueous solution of NaOH (1.6 equivalents, 1.68 g, 42 mmol) and NaBr (3.1 equivalents, 8.64 g, 84 mmol) for 24 hours. Then, 600 mL of ethanol was added to the solution to facilitate vacuum-assisted filtration using a Buchner filter paper. After filtration, the wet powder was redispersed in 310 mL of aqueous NaBr solution (2 equivalents, 5.76 g, 56 mmol) for 24 hours. 600 mL of ethanol was added prior to vacuum-assisted Buchner filtration.Finally, the wet powder was redispersed in 310 mL of MilliQ water for 24 hours. 600 mL of ethanol was added before the final vacuum-assisted Buchner filtration. MilliQ water (300 mL) and then ethanol (300 mL) were added to further wash the powder on the filter. The collected pink powder was dried under vacuum at 40 °C for 24 hours (11.25 g, 83% yield).

[0096] List of reference symbols Process for reacting at least one monomer of an ionic liquid with at least one crosslinker to produce a polymer Modification of the polymer to produce an amino group-containing polymer

Claims

Patent claims 1 . A process for producing a sorbent comprising the steps: - reacting at least one monomer of an ionic liquid with at least one crosslinker to produce a polymer, - Modification of the polymer to produce a polymer containing amino groups, wherein the at least one crosslinker is selected from the group consisting of acrylate, acrylamide, R 1 -[CH=CH2]n with R 1 = Alkyl, aryl, n>2, and derivatives thereof.

2. The process according to claim 1, wherein the at least one monomer is an imidazolium derivative.

3. The process according to claim 1 or 2, wherein the at least one monomer is an imidazolium derivative comprising at least one ammonium group.

4. The process according to at least one of claims 1 to 3, wherein the at least one monomer is a monomer of formula 1 Formula 1 , where R 2is selected from the group consisting of alkyl, alkenyl and aryl and X is a halogen.

5. The process according to at least one of claims 1 to 4, wherein the at least one crosslinker is an acrylamide.

6. The method according to at least one of claims 1 to 5, wherein the at least one crosslinker is a crosslinker of formula 2 7. The process according to any one of claims 1 to 6, wherein the modification of the polymer comprises treating the polymer with a base.

8. Sorbent prepared by a process according to at least one of claims 1 to 7.

9. Sorbent comprising an amino group-containing polymer of general formula 3, wherein Formula 3, with Ri = C12-C18 alkyl, R2 = alkyl, alkenyl, aryl, cyclyl, n > 3, m > 1, o > 1, P^2, X = CI, Br, I, is.

10. Sorbent according to claim 9 of general formula 4, wherein Formula 4, with Ri = C12-C18 alkyl, R2 = alkyl, alkenyl, aryl, cyclyl, n > 3, m > 1, o > 1, P^2, X= CI, Br, I, is. is.

11. Sorbent according to claim 9 or 10 of general formula 5, wherein Formula 5, with n > 3, m > 1, p > 1, q > 1, is.

12. Use of at least one sorbent according to at least one of claims 8 to 11 for the sorption of CO2.

13. A process for the sorption of CCh from a gaseous mixture, comprising the step of: - contacting a gaseous mixture comprising CO2 with at least one sorbent according to at least one of claims 8 to 11.

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