Electrochemical production of an alkaline solution using CO2
First Claim
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1. An electrochemical system comprising:
- a cathode electrolyte comprising added carbon dioxide and in contact with a cathode in a cathode compartment;
a first cation exchange membrane separating the cathode electrolyte from an anode electrolyte wherein the anode electrolyte is in contact with an anode in an anode compartment and comprises a salt and an acid;
a mineral dissolution system operatively connected to the anode compartment and wherein the mineral dissolution system is configured to dissolve a mineral with the acid in the anode electrolyte and produce a mineral solution comprising divalent cations, un-reacted acid and the salt; and
a nano-filtration system operatively connected to the mineral dissolution system and wherein the nano-filtration system is configured to receive the mineral solution and produce a first mineral solution comprising the salt and un-reacted acid, and a second mineral solution comprising divalent cations.
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Abstract
An electrochemical system comprising a cathode electrolyte comprising added carbon dioxide and contacting a cathode; and a first cation exchange membrane separating the cathode electrolyte from an anode electrolyte contacting an anode; and an electrochemical method comprising adding carbon dioxide into a cathode electrolyte separated from an anode electrolyte by a first cation exchange membrane; and producing an alkaline solution in the cathode electrolyte and an acid.
339 Citations
24 Claims
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1. An electrochemical system comprising:
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a cathode electrolyte comprising added carbon dioxide and in contact with a cathode in a cathode compartment; a first cation exchange membrane separating the cathode electrolyte from an anode electrolyte wherein the anode electrolyte is in contact with an anode in an anode compartment and comprises a salt and an acid; a mineral dissolution system operatively connected to the anode compartment and wherein the mineral dissolution system is configured to dissolve a mineral with the acid in the anode electrolyte and produce a mineral solution comprising divalent cations, un-reacted acid and the salt; and a nano-filtration system operatively connected to the mineral dissolution system and wherein the nano-filtration system is configured to receive the mineral solution and produce a first mineral solution comprising the salt and un-reacted acid, and a second mineral solution comprising divalent cations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14, 15, 16, 17, 18, 19, 20)
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9. An method comprising:
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adding carbon dioxide into a cathode electrolyte in contact with a cathode in a cathode compartment of an electrochemical system wherein the cathode electrolyte is separated from an anode electrolyte by a first cation exchange membrane and wherein the anode electrolyte is in contact with an anode in an anode compartment; producing an alkaline solution in the cathode electrolyte without producing a gas at the anode in contact with the anode electrolyte by applying a voltage across the anode and cathode to reduce water to hydroxide ions and hydrogen gas at the cathode, migrate the hydroxide ions into the cathode electrolyte, and migrate cations from a salt in the anode electrolyte into the cathode electrolyte through the first cation exchange membrane; producing an acid in the anode electrolyte by reducing hydrogen at the anode to hydrogen ions and migrating the hydrogen ions into the anode electrolyte; dissolving a mineral using the anode electrolyte in a mineral dissolution system operatively connected to the anode compartment to produce a mineral solution comprising divalent cations, un-reacted acid and the salt; and separating the salt and un-reacted acid from the mineral solution in a first mineral solution, and separating the divalent cations from the mineral solution in a second mineral solution using a nano-filtration system. - View Dependent Claims (10, 11, 12, 13, 21, 22, 23, 24)
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Specification