Carbon dioxide sequestration materials and processes
First Claim
1. A method of removing carbon dioxide from an effluent stream comprising carbon dioxide, the method comprising:
- reducing an amount of carbon dioxide in the effluent stream by contacting the effluent stream with a scrubbing material comprising;
(i) a first component comprising a source of calcium oxide and a source of alkali metal ions and (ii) a second component comprising one or more reactive silicate compounds, wherein the first component is distinct from the second component, wherein the contacting occurs in the presence of water and the alkali metal ions of the first component contribute to increasing a pH of the scrubbing material to about 9 or higher to increase the rate of reaction of the carbon dioxide with the scrubbing material, wherein the contacting reduces a total amount of the carbon dioxide to less than or equal to about 50% of an initial amount of the carbon dioxide prior to the contacting.
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Abstract
The disclosure provides methods and systems for sequestering and/or reducing carbon dioxide present in an industrial effluent fluid stream containing carbon dioxide. A scrubbing material comprising a first component, a second component (distinct from the first component), and preferably water, is contacted with the effluent fluid stream. The first component comprises a source of calcium oxide and a source of alkali metal ions. The second component comprises a slag having one or more reactive silicate compounds. Methods of reducing carbon dioxide from exhaust generated by combustion sources, lime and/or cement kilns, iron and/or steel furnaces, and the like are provided. Carbon dioxide emission abatement systems are also disclosed. Methods of recycling industrial byproducts are further provided.
71 Citations
20 Claims
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1. A method of removing carbon dioxide from an effluent stream comprising carbon dioxide, the method comprising:
reducing an amount of carbon dioxide in the effluent stream by contacting the effluent stream with a scrubbing material comprising;
(i) a first component comprising a source of calcium oxide and a source of alkali metal ions and (ii) a second component comprising one or more reactive silicate compounds, wherein the first component is distinct from the second component, wherein the contacting occurs in the presence of water and the alkali metal ions of the first component contribute to increasing a pH of the scrubbing material to about 9 or higher to increase the rate of reaction of the carbon dioxide with the scrubbing material, wherein the contacting reduces a total amount of the carbon dioxide to less than or equal to about 50% of an initial amount of the carbon dioxide prior to the contacting.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of removing carbon dioxide from an effluent stream comprising carbon dioxide, the method comprising:
reducing an amount of carbon dioxide in the effluent stream by contacting the effluent stream with a scrubbing material comprising (i) a first component comprising a source of calcium oxide and a source of alkali metal ions and (ii) a second component comprising one or more reactive silicate compounds, wherein the first component is distinct from the second component, a ratio of the first component to the second component in the scrubbing material is about 10;
1 to about 1;
10 and a molar ratio of calcium (Ca) to silicon (Si) in the scrubbing material is about 1;
1 to about 10;
1, wherein the contacting occurs in the presence of water, and the alkali metal ions of the first component contribute to increasing a pH of the scrubbing material to about 9 or higher to increase the rate of reaction of the carbon dioxide with the scrubbing material, and the contacting reduces a total amount of the carbon dioxide to less than or equal to about 50% of an initial amount of the carbon dioxide prior to the contacting.- View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method of removing carbon dioxide from an effluent stream generated by an industrial process comprising carbon dioxide, the method comprising:
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reducing an amount of carbon dioxide in the effluent stream generated by the industrial process by contacting the effluent stream with a scrubbing material comprising (i) a first component selected from the group consisting of;
cement kiln dust (CKD), lime kiln dust (LKD), sugar beet lime (SBL), clinker dust, slaked lime, quick lime, and combinations thereof and (ii) a second component comprising a material selected from the group consisting of;
blast furnace slag, steel slag, and combinations thereof,wherein the contacting occurs in the presence of water, wherein the alkali metal ions of the first component contribute to increasing a pH of the scrubbing material to about 9 or higher to increase the rate of reaction of the carbon dioxide with the scrubbing material, wherein the contacting reduces a total amount of the carbon dioxide to less than or equal to about 50% of an initial amount of the carbon dioxide prior to the contacting. - View Dependent Claims (18, 19, 20)
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Specification