Removing carbon dioxide from waste streams through co-generation of carbonate and/or bicarbonate minerals

摘要

Methods for removing carbon dioxide and other pollutants from a gas stream are provided. The methods include obtaining hydroxide in an aqueous mixture, mixing the hydroxide with the gas stream to produce bicarbonate products or a combination of carbonate and bicarbonate products in an admixture, separating the products from the admixture, and using the products to perform ion-exchanges with one or more group-1 or group-2 salts to precipitate carbonates, wherein obtaining the hydroxide comprises obtaining a group-1 or group-2 salt; mixing the salt with acid and water, acid and steam, or acid, water, and steam to produce a protonated brine solution; and electrolyzing the protonated brine solution to produce a hydroxide; and wherein mixing the hydroxide with the gas stream comprises altering the product equilibrium to favor the production of bicarbonate products.

主权项

1. A method of sequestering carbon dioxide produced by a source and contained in a gas stream, comprising the steps of:
(a) obtaining a hydroxide in an aqueous mixture; (b) admixing the hydroxide with carbon dioxide produced by the source to produce bicarbonate products or a combination of carbonate and bicarbonate products in an admixture; (c) separating said products from the admixture, thereby sequestering the carbon dioxide in a mineral product form; and (d) using said products to perform ion-exchanges with one or more group-1 or group-2 salts to precipitate carbonates; wherein obtaining the hydroxide comprises:
obtaining a group-1 or group-2 salt;admixing the salt with acid and water, acid and steam, or acid, water, and steam to produce a protonated brine solution; andelectrolyzing the protonated brine solution to produce a hydroxide; wherein step (b) comprises altering the product equilibrium to favor the production of bicarbonate products.