# US 9,873,079 B2 · Process for capturing CO2 from a CO2-containing gas stream using a thermoresponsive copolymer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,873,079 B2 - Document ID: US9873079B2 - Status: Granted - Kind: B2 - Application number: 14/777,269 - Filed: 2014-03-12 - Published: 2016-02-04 - Granted: 2018-01-23 - Earliest claimed: 2013-03-15 - Assignees: CarbonOrO B.V. - Applicants: CarbonOrO B.V. - Inventors: Johannes Petrus Aldegonda Custers; Matheus Theodorus De Groot; Antoon Jacob Berend Ten Kate; Dirk Theodorus Andreas Van Asseldonk; Johannes Theodorus Faustinus Keurentjes - Web page: https://patentgrep.com/patent/US9873079B2 ## CPC - B01D 53/1475: {Removing carbon dioxide} - B01D 53/1493: {Selection of liquid materials for use as absorbents} - B01D 53/62: Carbon oxides - B01D 53/1425: {Regeneration of liquid absorbents} - B01D 2252/2053: Other nitrogen compounds - B01D 2252/504: Mixtures of two or more absorbents - B01D 2257/504: Carbon dioxide - Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters - Y02C 20/40: of CO2 - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE - Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG] ## Abstract A process capturing CO2 from a CO2-containing gas stream, contacting a CO2-containing gas stream with a CO2-absorbing agent in an absorption step in a vessel with maximum temperature T1 resulting in absorption of CO2. The CO2 absorbing agent comprising a polymer dissolved in an aqueous medium, the polymer, a thermoresponsive copolymer, comprising amine monomer distributed through the copolymer, subjecting the CO2-containing absorbing agent to a desorption step in a vessel with maximum temperature T2, releasing CO2, wherein T1 is below LCST of the thermoresponsive polymer at maximum CO2 loading, and T2 is above LCST of the thermoresponsive polymer at minimum CO2 loading. CO2 absorbing agent comprises amine component dissolved in the aqueous medium. Use of the specific polymer dissolved in an aqueous medium at T1, wherein amine monomer, distributed through the copolymer with an amine component, improves net CO2 sorption and high absorption speed, allowing a relatively small absorption reactor. ## Claims ### Claim 1 A method for capturing CO2 from a CO2-containing gas stream, comprising: (a) contacting a CO2-containing gas stream with a CO2-absorbing agent in an absorption step in a vessel with a maximum temperature T1, resulting in absorption of CO2, wherein the CO2-absorbing agent comprises a polymer and an amine component dissolved in an aqueous medium, wherein the polymer is a thermoresponsive copolymer comprising an amine monomer distributed through the copolymer based on one of the following monomer combinations: the combination of dimethylamino propyl acryl amide and n-isopropyl methacryl amide, the combination of n-isopropyl methacryl amide and dimethylamino ethyl acrylamide, the combination of dimethylaminoethyl acrylate and diethyleneglycolmethacrylate, or the combination of n-penta-methyleneacrylamide and dimethylamino propyl methacrylate, and wherein the amine component is present in an amount of up to 20 wt.%, and (b) subjecting the CO2-containing absorbing agent to a desorption step in a vessel with a maximum temperature T2, resulting in the release of CO2, wherein T1 is below the LCST of the thermoresponsive polymer at maximum CO2 loading, and T2 is above the LCST of the thermoresponsive polymer at minimum CO2 loading. ### Claim 2 (depends on 1) The method according to claim 1, wherein the amine component dissolved in the aqueous medium is present in an amount of 10 to 20 wt. %. ### Claim 3 (depends on 1) The method according to claim 1, wherein the thermoresponsive polymer has an LCST in the range of 1-99° C. ### Claim 4 (depends on 1) The method according to claim 1, wherein the amine monomers are distributed such that at least 80% of the amine monomers in the polymer are present in arrays of maximum 10 amine monomers, which are combined with arrays of thermoresponsive monomers, with each polymer molecule comprising at least 2 areas of both monomer types. ### Claim 5 (depends on 1) The method according to claim 1, wherein at least 50% of the amine monomers is present in the copolymer in arrays with a size of 1-8 monomers. ### Claim 6 (depends on 1) The method according to claim 1, wherein the thermoresponsive monomer is distributed such that at least 50% of the thermoresponsive monomers in the polymer are present in arrays of 3-30 monomers. ### Claim 7 (depends on 1) The method according to claim 1, wherein the amine monomer content in the thermoresponsive copolymer is in the range of 0.1-99 mol %. ### Claim 8 (depends on 1) The method according to claim 1, wherein net CO2 sorption is at least 0.3. ### Claim 9 (depends on 1) The method according to claim 1, wherein the polymer is substantially free from crosslinking monomers. ### Claim 10 (depends on 1) The method according to claim 1, wherein the CO2-absorbing agent comprises 0.1-70 wt % of thermoresponsive copolymer. ### Claim 11 (depends on 1) The method according to claim 1, wherein the amine monomer is selected from the group consisting of dimethylaminopropyl acrylamide, diethylaminoethyl methacrylamide, dimethylaminopropyl methacrylate and diethylaminoethyl acrylate. ### Claim 12 (depends on 1) The method according to claim 1, wherein the CO2-content of the CO2-containing gas stream is in the range of 1 to 20 vol. %, calculated on the total volume of the gas stream. ### Claim 13 (depends on 1) The method according to claim 1, wherein T1 is between 0-90° C. ### Claim 14 (depends on 1) The method according to claim 1, wherein T2 is between 40-100° C. ### Claim 15 A method for capturing CO2 from a CO2-containing gas stream, comprising: (a) contacting a CO2-containing gas stream with a CO2-absorbing agent in an absorption step in a vessel with a maximum temperature T1, resulting in absorption of CO2, wherein the CO2-absorbing agent comprises a polymer and an amine component dissolved in an aqueous medium, wherein the polymer is a thermoresponsive copolymer comprising an amine monomer distributed through the copolymer, wherein the amine monomer is selected from the group consisting of dimethylaminopropyl acrylamide, diethylaminoethyl methacrylamide, dimethylaminopropyl methacrylate and diethylaminoethyl acrylate, and wherein the amine component is present in an amount of up to 20 wt. %, and (b) subjecting the CO2-containing absorbing agent to a desorption step in a vessel with a maximum temperature T2, resulting in the release of CO2, wherein T1 is below the LCST of the thermoresponsive polymer at maximum CO2 loading, and T2 is above the LCST of the thermoresponsive polymer at minimum CO2 loading. ### Claim 16 (depends on 1) The method according to claim 1, wherein the amine component dissolved in the aqueous medium is present in an amount of 10 to 20wt. %. ### Claim 17 (depends on 1) The method according to claim 1, wherein the thermoresponsive polymer has an LCST in the range of 1-99° C. ### Claim 18 (depends on 1) The method according to claim 1, wherein the amine monomers are distributed such that at least 80% of the amine monomers in the polymer are present in arrays of maximum 10 amine monomers, which are combined with arrays of thermoresponsive monomers, with each polymer molecule comprising at least 2 areas of both monomer types. ### Claim 19 (depends on 1) The method according to claim 1, wherein at least 50% of the amine monomers is present in the copolymer in arrays with a size of 1-8monomers. ### Claim 20 (depends on 1) The method according to claim 1, wherein the thermoresponsive monomer is distributed such that at least 50% of the thermoresponsive monomers in the polymer are present in arrays of 3-30 monomers. ### Claim 21 (depends on 1) The method according to claim 1, wherein the amine monomer content in the thermoresponsive copolymer is in the range of 0.1-99mol %. ### Claim 22 (depends on 1) The method according to claim 1, wherein the polymer is based on one of the following monomer combinations: the combination of dimethylamino propyl acryl amide and n-isopropyl methacryl amide, the combination of n-isopropyl methacryl amide and dimethylamino ethyl acrylamide, the combination of dimethylaminoethyl acrylate and diethyleneglycolmethacrylate, or the combination of n-penta-methyleneacrylamide and dimethylamino propyl methacrylate. ### Claim 23 (depends on 1) The method according to claim 1, wherein net CO2 sorption is at least 0.3. ### Claim 24 (depends on 1) The method according to claim 1, wherein the polymer is substantially free from crosslinking monomers. ### Claim 25 (depends on 1) The method according to claim 1, wherein the CO2-absorbing agent comprises 0.1-70 wt % of thermoresponsive copolymer. ### Claim 26 (depends on 1) The method according to claim 1, wherein the CO2-content of the CO2-containing gas stream is in the range of 1 to 20 vol. %, calculated on the total volume of the gas stream. ### Claim 27 (depends on 1) The method according to claim 1, wherein T1 is between 0-90° C. ### Claim 28 (depends on 1) The method according to claim 1, wherein T2 is between 40-100° C.