The present invention is directed to methods for removing CO2 from air, which comprises exposing sorbent covered surfaces to the air. The invention also provides for an apparatus for exposing air to a CO2 sorbent. In another aspect, the invention provides a method and apparatus for separating carbon dioxide (CO2) bound in a sorbent.

Removal of carbon dioxide from air

A method an apparatus for solution mining using a single well. Fluid (55) is injected by conduit (45). Solution is produced through casing (60b) external to the conduit (45). Fluid may be heated, and may be caustic.

Apparatus, method and system for single well solution-mining

A method and apparatus for extracting CO 2 from air comprising an anion exchange material formed in a matrix exposed to a flow of the air, and for delivering that extracted CO 2 to controlled environments. The present invention contemplates the extraction of CO2 from air using conventional extraction methods or by using one of the extraction methods disclosed; e.g., humidity swing or electro dialysis. The present invention also provides delivery of the CO 2 to greenhouses where increased levels of CO 2 will improve conditions for growth. Alternatively, the CO 2 is fed to an algae culture.

Method and apparatus for extracting carbon dioxide from air

There is provided a process for the capture and sequestration of carbon dioxide that would otherwise enter the atmosphere and contribute to global warming and other problems. CO2 capture is accomplished by reacting carbon dioxide in flue gas with an alkali metal carbonate, or a metal oxide, particularly containing an alkaline earth metal or iron, to form a carbonate salt. A preferred carbonate for CO2 capture is a dilute aqueous solution of additive-free (Na2CO3). Other carbonates include (K2CO3) or other metal ion that can produce both a carbonate and a bicarbonate salt. Examples of suitable metal oxides include several alkaline earths including CaO and MgO. The captured CO2 is preferably sequestered using any available mineral or industrial waste that contains calcium magnesium or iron in non- carbonate forms, or iron in the Fe+2 oxidation state.

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Capture and sequestration of carbon dioxide in flue gases

The present disclosure provides a method and apparatus for extracting carbon dioxide (CO2) from a fluid stream and for delivering that extracted CU2 to controlled environments for utilization by a secondary process. Various extraction and delivery methods are disclosed specific to certain secondary uses, included the attraction of C02-sensitive insects, the ripening and preservation of produce, and the neutralization of brine.

Extraction and sequestration of carbon dioxide

A process for forming useful sodium salts by uniquely processing dilute mine brines obtained by solution mining of a sodium bicarbonate containing ore deposit with an aqueous solvent is disclosed. The dilute mine brine is reduced in sodium bicarbonate content to prevent precipitation of the sodium bicarbonate in subsequent crystallization of sodium carbonate decahydrate. The reduced mine brine is directed to a crystallizer operated to form pure sodium carbonate decahydrate crystals and a carbonate/bicarbonate containing mother liquor in which the bicarbonate content is less than 4.5% by weight. The mother liquor is then steam stripped to convert a portion of the dissolved sodium bicarbonate in the mother liquor to sodium carbonate to form a carbonate enriched brine. The carbonate enriched brine is then recycled as a portion of said aqueous solvent to be used in the solution mining of the ore deposit.

Production of sodium carbonate from solution mine brine

A solution mining process for recovering sodium values from an underground deposit of a sodium bicarbonate containing ore is disclosed. The process involves contacting the ore with an aqueous sodium carbonate-containing solution to produce a dilute brine which is stripped with steam to reduce the bicarbonate content and increase the carbonate content. The dilute carbonate/bicarbonate solution from the stripper is fed to a sodium carbonate decahydrate crystallizer to produce pure sodium carbonate decahydrate crystals and a mother liquor containing less than about 4% sodium bicarbonate.

Solution mining of carbonate/bicarbonate deposits to produce soda ash

A process for producing sodium carbonate and other sodium-based chemicals from an aqueous solution containing sodium bicarbonate by contacting an aqueous solution of a bicarbonate-containing composition with a gas that is predominately other than carbon dioxide in an amount and for a time adequate to cause a sufficient amount of carbon dioxide to leave the aqueous solution to reduce the amount of bicarbonate ion in the solution by converting the bicarbonate to carbonate as carbon dioxide leaves the solution and thereafter converting the remaining solution to other sodium salts.

Equilibrium production of sodium carbonate from sodium bicarbonate

Methods of forming potassium sulfate include calcining polyhalite ore particles to convert the polyhalite ore particles to a water soluble composition. At least a portion of the water soluble composition is dissolved in an aqueous medium to form an aqueous solution comprising K+, Mg2+, and SO4 2- ions and a calcium containing solid. The calcium containing solid is separated from the aqueous solution to form a filtrate comprising K+, Mg2+, and SO4 2 ions. A potassium containing salt is dissolved in the filtrate to increase the concentration of K+ and SO4 2- ions to form a concentrated liquor, and K2SO4 is crystallized from the concentrated liquor. A system for processing polyhalite ore includes a countercurrent leaching apparatus, a first mix tank, an evaporator, and at least one crystallizer.

Methods of processing polyhalite ore methods of producing potassium sulfate and related systems

A process for forming useful sodium salts by uniquely processing dilute brine solutions having sodium bicarbonate concentrations is disclosed. The dilute brine is reduced in sodium bicarbonate content to prevent precipitation of the sodium bicarbonate in subsequent crystallization of sodium carbonate decahydrate. The reduced brine is directed to a crystallizer operated to form pure sodium carbonate decahydrate crystals and a carbonate/bicarbonate containing mother liquor. The mother liquor is then recycled as a portion of said aqueous solvent to be used in the solution mining of the ore deposit.

Thomas H. Neuman

Papers

Production of sodium carbonate from solution mine brine

Solution mining of carbonate/bicarbonate deposits to produce soda ash

Equilibrium production of sodium carbonate from sodium bicarbonate

Methods of processing polyhalite ore methods of producing potassium sulfate and related systems

Process for making sodium carbonate decahydrate from sodium carbonate/bicarbonate liquors