ELECTROCHEMICAL METHODS AND PROCESSES FOR CARBON DIOXIDE RECOVERY FROM ALKALINE SOLVENTS FOR CARBON DIOXIDE CAPTURE FROM AIR
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Abstract
The present invention relates to methods for recovering a hydroxide based sorbent from carbonate or another salt by electrochemical means involving separation schemes that use bipolar membranes and at least one type of cationic or anionic membrane. The methods can be used in an air contactor that removes carbon dioxide from the air by binding the carbon dioxide into a solvent or sorbent.
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Citations
62 Claims
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1-34. -34. (canceled)
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35. A method for removing CO2 from the air comprising:
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binding the CO2 as a carbonate in a hydroxide/carbonate brine, concentrating the hydroxide/carbonate brine to approach a carbonate saturation point, and separating the concentrated hydroxide/carbonate brine by thermal swing precipitation of the carbonate from the brine, wherein the separated carbonate is electrochemically separated into sodium hydroxide solution and sodium carbonate solution by electrodialysis through bipolar membranes. - View Dependent Claims (36, 43, 44, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57)
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37. A method for removing CO2 from the air comprising:
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binding the CO2 as a carbonate in a hydroxide/carbonate brine in a device that comprises a plurality of cells separated by alternating bipolar membranes and cationic membranes, flowing concentrated carbonate brine and a dilute NaOH solution, respectively, through alternating cells, whereby sodium ions transfer across the cationic membranes, and the bipolar membranes provide necessary hydroxide ions and protons to maintain charge neutrality in the concentrated carbonated brine and the dilute NaOH solution. - View Dependent Claims (38, 39, 40, 41, 42, 58, 59, 60, 61, 62)
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45. A method for removing CO2 from the air comprising:
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binding the CO2 as a carbonate in a hydroxide/carbonate brine, concentrating the hydroxide/carbonate brine to approach a carbonate saturation point, and separating the concentrated hydroxide/carbonate brine by mixing the bicarbonate with an acid to release carbon dioxide, recovering the acid through electrodialysis, and recycling the acid to neutralize the brine. - View Dependent Claims (46)
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Specification