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Method for sequestering CO.sub.2 and SO.sub.2 utilizing a plurality of waste streams

United States Patent

April 12, 2011
View the Complete Patent at the US Patent & Trademark Office
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A neutralization/sequestration process is provided for concomitantly addressing capture and sequestration of both CO.sub.2 and SO.sub.2 from industrial gas byproduct streams. The invented process concomitantly treats and minimizes bauxite residues from aluminum production processes and brine wastewater from oil/gas production processes. The benefits of this integrated approach to coincidental treatment of multiple industrial waste byproduct streams include neutralization of caustic byproduct such as bauxite residue, thereby decreasing the risk associated with the long-term storage and potential environmental of storing caustic materials, decreasing or obviating the need for costly treatment of byproduct brines, thereby eliminating the need to purchase CaO or similar scrubber reagents typically required for SO.sub.2 treatment of such gasses, and directly using CO.sub.2 from flue gas to neutralize bauxite residue/brine mixtures, without the need for costly separation of CO.sub.2 from the industrial byproduct gas stream by processes such as liquid amine-based scrubbers.
Soong; Yee (Monroeville, PA), Allen; Douglas E. (Salem, MA), Zhu; Chen (Monroe County, IN)
U.S. Department of Energy (Washington, DC)
12/ 046,714
March 12, 2008
CONTRACTUAL ORIGIN OF THE INVENTION The United States Government has rights in this invention pursuant to an employer/employee relationship between the U.S. Department of Energy (DOE) and the inventor, Yee Soong.