# US 9,751,042 B2 · Systems and methods for CO2 removal from flue gas by temperature swing absorption > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,751,042 B2 - Document ID: US9751042B2 - Status: Granted - Kind: B2 - Application number: 14/801,380 - Filed: 2015-07-16 - Published: 2016-01-21 - Granted: 2017-09-05 - Earliest claimed: 2014-07-18 - Assignees: New Jersey Institute of Technology - Applicants: New Jersey Institute of Technology - Inventors: Kamalesh K. Sirkar - Web page: https://patentgrep.com/patent/US9751042B2 ## CPC - B01D 53/1475: {Removing carbon dioxide} - B01D 53/229: {Integrated processes (Diffusion and at least one other process, e.g. adsorption, absorption)} - B01D 53/1425: {Regeneration of liquid absorbents} - B01D 53/1493: {Selection of liquid materials for use as absorbents} - B01D 2053/224: {with hollow fibres} - B01D 2252/20415: Tri- or polyamines - B01D 2252/20421: Primary amines - B01D 2252/20426: Secondary amines - B01D 2252/20431: Tertiary amines - B01D 2252/20489: with two or more hydroxyl groups - B01D 2252/30: Ionic liquids and zwitter-ions - B01D 2257/504: Carbon dioxide - B01D 2258/0283: Flue gases - B01D 2325/38: Hydrophobic membranes - 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 The present disclosure provides improved systems, assemblies and methods to remove and recover CO2 from emissions. More particularly, the present disclosure provides improved membrane contactors configured to remove CO2 from flue gas by temperature swing absorption. In exemplary embodiments, the present disclosure provides a novel hollow fiber membrane contactor that integrates absorption and stripping using a nonvolatile reactive absorbent (e.g., 80% polyamidoamine (PAMAM) dendrimer generation 0, and 20% of an ionic liquid (IL)). Equilibrium CO2 absorption in the nonvolatile viscous mixed absorbent is as high as 6.37 mmolCO2/g absorbent in the presence of moisture at 50° C. A novel membrane contactor is provided for CO2 absorption and stripping via a process identified as temperature swing membrane absorption (TSMAB). The contactor integrates non-dispersive gas absorption and hot water-based CO2 stripping in one device/assembly containing two sets of commingled hollow fibers. ## Claims ### Claim 1 A method to remove CO2 from emissions comprising: providing a housing; disposing a first plurality and a second plurality of hollow fibers in the housing, the first plurality of hollow fibers including porous wall hydrophobic hollow fibers and the second plurality of hollow fibers including solid wall hollow fibers; disposing an absorbent in the housing between the first and second plurality of hollow fibers; flowing feed gas through the first plurality of hollow fibers, the first plurality of hollow fibers configured to allow CO2 from the feed gas to diffuse to and be absorbed in the absorbent; shutting down the flow of feed gas; flowing hot water through the second plurality of hollow fibers to heat the absorbent and strip the absorbed CO2 into the first plurality of hollow fibers; and withdrawing the stripped CO2 from the housing through the first plurality of hollow fibers. ### Claim 2 (depends on 1) The method of claim 1, wherein the feed gas is flowed through the first plurality of hollow fibers at about 50° C.; and wherein the hot water is flowed through the second plurality of hollow fibers between about 85° C. and about 97° C. ### Claim 3 (depends on 1) The method of claim 1, wherein after the stripped CO2 is withdrawn, the method further includes the step of flowing cold water through the second plurality of hollow fibers to cool the absorbent. ### Claim 4 (depends on 1) The method of claim 1, wherein the absorbent is a substantially pure low molecular weight amine absorbent. ### Claim 5 (depends on 1) The method of claim 1, wherein the absorbent is selected from the group consisting of methyldiethanolamine, diethanolamine, aMDEA, primary amines, secondary amines, tertiary amines, hindered amines, oligomeric nonvolatile amines, polyamidoamine dendrimer generation 0, and mixtures thereof. ### Claim 6 (depends on 1) The method of claim 1, wherein the first and second plurality of hollow fibers include polymeric hollow fibers that are commingled with one another within the housing. ### Claim 7 (depends on 1) The method of claim 1, wherein the second plurality of hollow fibers are substantially impermeable to moisture, CO2, N2 and O2. ### Claim 8 (depends on 1) The method of claim 1, wherein the absorbent includes from about 5% to about 50% water; and wherein the housing is connected to a reservoir containing additional absorbent. ### Claim 9 (depends on 1) The method of claim 1, wherein the first plurality of hollow fibers includes hollow fibers having an outer diameter of about 290 μm and an inner diameter of about 240 μm, and having a wall porosity of from about 0.20 to about 0.80; and wherein the second plurality of hollow fibers includes hollow fibers having an inner diameter between about 250 μm and about 300 gm, and having a solid wall thickness between about 50 μm to about 75 μm. ### Claim 10 (depends on 1) The method of claim 1, wherein the first plurality of hollow fibers includes hollow fibers having a highly porous superhydrophobic fluorosiloxane coating on the outer diameter of the fibers. ### Claim 11 A method to remove CO2 from emissions comprising: providing a cylindrical housing; disposing a first plurality and a second plurality of polymeric hollow fibers in the cylindrical housing, the first plurality of polymeric hollow fibers including porous wall hydrophobic hollow fibers and the second plurality of polymeric hollow fibers including solid wall hollow fibers, the first and second plurality of polymeric hollow fibers commingled with one another within the cylindrical housing; disposing an amine absorbent in the cylindrical housing between the first and second plurality of polymeric hollow fibers; flowing flue gas through the first plurality of polymeric hollow fibers, the first plurality of polymeric hollow fibers configured to allow CO2 from the flue gas to diffuse to and be absorbed in the amine absorbent; shutting down the flow of flue gas; flowing hot water through the second plurality of polymeric hollow fibers to heat the amine absorbent and strip the absorbed CO2 into the first plurality of polymeric hollow fibers; withdrawing the stripped CO2 from the cylindrical housing through the first plurality of polymeric hollow fibers; and flowing cold water, after the stripped CO2 is withdrawn, through the second plurality of polymeric hollow fibers to cool the amine absorbent.