# US 11,305,228 B2 · Method for fixing carbon dioxide, method for producing fixed carbon dioxide, and fixed carbon dioxide production apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,305,228 B2 - Document ID: US11305228B2 - Status: Granted - Kind: B2 - Application number: 17/051,350 - Filed: 2019-08-29 - Published: 2021-08-26 - Granted: 2022-04-19 - Earliest claimed: 2019-08-29 - Assignees: Kenji Sorimachi; Shinko Sangyo Co. Ltd. - Applicants: Kenji Sorimachi; SHINKO SANGYO Co., Ltd. - Inventors: Kenji Sorimachi - Web page: https://patentgrep.com/patent/US11305228B2 ## CPC - B01D 53/62: Carbon oxides - C01B 32/60: Preparation of carbonates or bicarbonates in general (of percarbonates C01B15/10; of specific carbonates or bicarbonates according to the cation C01B-C01G) - B01D 53/78: with gas-liquid contact - C01F 11/18: Carbonates - C01F 11/181: {Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions} - B01D 2251/304: of sodium - B01D 2251/404: of calcium - B01D 2251/50: Inorganic acids - B01D 2251/502: Hydrochloric acid - B01D 2251/604: Hydroxides - B01D 2257/504: Carbon dioxide - B01D 2258/0283: Flue gases - Y02C 20/40: of CO2 - Y02P 20/151: Reduction of greenhouse gas [GHG] emissions, e.g. 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) - C01B: NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; {METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C} - C01F: COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts of peroxyacids C01B15/00; sulfides or polysulfides of magnesium, calcium, strontium, or barium C01B17/42; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds other than ammonia or cyanogen containing nitrogen and non-metals and optionally metals C01B21/082; amides or imides of silicon C01B21/087}; metal {imides or} amides C01B21/092, {C01B21/0923}; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanic acid C01C3/14; salts of cyanamide C01C3/16; thiocyanates C01C3/20; {double sulfates of magnesium with sodium or potassium C01D5/12; with other alkali metals C01D15/00, C01D17/00}) - Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG] - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract The present invention provides a new method for fixing carbon dioxide. The method for fixing carbon dioxide of the present invention includes a contact step of bringing a mixed liquid containing sodium hydroxide and further containing at least one of a chloride of a Group 2 element or a chloride of a divalent metal element into contact with a gas containing carbon dioxide. ## Claims ### Claim 1 A method for fixing carbon dioxide, comprising: a contact step of bringing a mixed liquid containing sodium hydroxide and further containing at least one of a chloride of a Group 2 element or a chloride of a divalent metal element into contact with a gas containing carbon dioxide. ### Claim 2 (depends on 1) The method for fixing carbon dioxide according to claim 1, comprising: a contact step of bringing a mixed liquid containing sodium hydroxide and calcium chloride into contact with a gas containing carbon dioxide. ### Claim 3 (depends on 1) The method for fixing carbon dioxide according to claim 1, wherein a concentration of the sodium hydroxide in the mixed liquid is less than 0.2 N. ### Claim 4 (depends on 1) The method for fixing carbon dioxide according to claim 1, wherein the concentration of the sodium hydroxide in the mixed liquid is 0.05 N or more. ### Claim 5 (depends on 1) The method for fixing carbon dioxide according to claim 1, wherein a concentration of the calcium chloride in the mixed liquid is 0.05 mol/l or more. ### Claim 6 (depends on 1) The method for fixing carbon dioxide according to claim 1, wherein in the contact step, the mixed liquid and the gas are brought into contact with each other by bubbling the gas into the mixed liquid. ### Claim 7 (depends on 1) The method for fixing carbon dioxide according to claim 1, wherein in the contact step, the mixed liquid and the gas are brought into contact with each other in a state where the mixed liquid is shaken. ### Claim 8 (depends on 1) The method for fixing carbon dioxide according to claim 1, wherein in the contact step, the mixed liquid and the gas are brought into contact with each other in a state where the mixed liquid is in a state of mist. ### Claim 9 (depends on 1) The method for fixing carbon dioxide according to claim 1, wherein the contact step comprises: a first contact step of bringing a mixed liquid containing sodium hydroxide into contact with a gas containing carbon dioxide; and a second contact step of adding calcium chloride to the mixed liquid and further bringing the mixed liquid into contact with a gas containing carbon dioxide. ### Claim 10 (depends on 1) A method for producing fixed carbon dioxide, comprising: a fixation step of fixing carbon dioxide, wherein the fixation step is carried out by the method for fixing carbon dioxide according to claim 1. ### Claim 11 A fixed carbon dioxide production apparatus, comprising: a contact unit that brings a mixed liquid containing sodium hydroxide and further containing at least one of a chloride of a Group 2 element or a chloride of a divalent metal element into contact with a gas containing carbon dioxide. ### Claim 12 (depends on 11) The fixed carbon dioxide production apparatus according to claim 11, comprising: a contact unit that brings a mixed liquid containing sodium hydroxide and calcium chloride into contact with a gas containing carbon dioxide. ### Claim 13 (depends on 11) The fixed carbon dioxide production apparatus according to claim 11, wherein the contact unit is a unit that brings the mixed liquid and the gas into contact with each other by bubbling the gas into the mixed liquid. ### Claim 14 (depends on 11) The fixed carbon dioxide production apparatus according to claim 11, wherein the contact unit is a unit that brings the mixed liquid and the gas into contact with each other in a state where a flow is generated in the mixed liquid. ### Claim 15 (depends on 14) The fixed carbon dioxide production apparatus according to claim 14, wherein the contact unit is a unit that brings the mixed liquid and the gas into contact with each other in a state where the mixed liquid is shaken. ### Claim 16 (depends on 14) The fixed carbon dioxide production apparatus according to claim 14, wherein the contact unit comprises a vessel in which the mixed liquid and the gas containing carbon dioxide are brought into contact with each other. ### Claim 17 (depends on 16) The fixed carbon dioxide production apparatus according to claim 16, wherein the vessel comprises a plurality of secondary vessels, and the mixed liquid is allowed to come into contact with the gas by sequentially flowing through the plurality of secondary vessels. ### Claim 18 (depends on 16) The fixed carbon dioxide production apparatus according to claim 16, wherein the vessel has a polygonal cross-section at a bottom surface. ### Claim 19 (depends on 16) The fixed carbon dioxide production apparatus according to claim 16, wherein the vessel has a network structure, and the mixed liquid is allowed to come into contact with the gas by flowing through the network structure. ### Claim 20 (depends on 14) The fixed carbon dioxide production apparatus according to claim 14, wherein the contact unit is a unit that brings the mixed liquid and the gas into contact with each other in a state where the mixed liquid is in a state of mist.