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Carbonation of metal silicates for long-term CO2 sequestration

United States Patent

March 18, 2014
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
In a preferred embodiment, the invention relates to a process of sequestering carbon dioxide. The process comprises the steps of: (a) reacting a metal silicate with a caustic alkali-metal hydroxide to produce a hydroxide of the metal formerly contained in the silicate; (b) reacting carbon dioxide with at least one of a caustic alkali-metal hydroxide and an alkali-metal silicate to produce at least one of an alkali-metal carbonate and an alkali-metal bicarbonate; and (c) reacting the metal hydroxide product of step (a) with at least one of the alkali-metal carbonate and the alkali-metal bicarbonate produced in step (b) to produce a carbonate of the metal formerly contained in the metal silicate of step (a).
Blencoe; James G. (Harriman, TN), Palmer; Donald A. (Oliver Springs, TN), Anovitz; Lawrence M. (Knoxville, TN), Beard; James S. (Martinsville, VA)
UT-Battelle, LLC (Oak Ridge, TN), University of Tennessee Research Foundation (Knoxville, TN), Virginia Museum of Natural History (Martinsville, VA)
13/ 361,215
January 30, 2012
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT The United States Government has rights in this invention pursuant to Contract No. DE-AC05-00OR22725 between the United States Department of Energy and UT-Battelle, LLC.