US 12,390,762 B1
Plant and method to improve the efficiency of CO2 capture and storage using precipitated calcium carbonate
Giovanni Cappello, Galbiate (IT)
Assigned to LIMENET S.R.L. SOCIETÀ BENEFIT, Galbiate (IT)
Appl. No. 19/100,183
Filed by LIMENET S.R.L. SOCIETÀ BENEFIT, Galbiate (IT)
PCT Filed Jul. 28, 2023, PCT No. PCT/IB2023/057676
§ 371(c)(1), (2) Date Jan. 31, 2025,
PCT Pub. No. WO2024/028721, PCT Pub. Date Feb. 8, 2024.
Claims priority of application No. 102022000016347 (IT), filed on Aug. 1, 2022.
Int. Cl. B01D 53/62 (2006.01); B01D 53/34 (2006.01); C01B 32/50 (2017.01); C01F 11/02 (2006.01); C01F 11/18 (2006.01)
CPC B01D 53/62 (2013.01) [B01D 53/346 (2013.01); C01B 32/50 (2017.08); C01F 11/02 (2013.01); C01F 11/181 (2013.01); B01D 2251/404 (2013.01); B01D 2251/606 (2013.01); B01D 2257/504 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A plant to improve the efficiency of CO2 capture and storage using precipitated calcium carbonate PCC, the plant comprising: an electric calciner, a contactor, an apparatus for pH correction, a dosing device for the buffering substance, an absorber/precipitator, a separator, and a PCC dosing device, wherein:
the electric calciner is configured for receiving at the inlet a flow of carbonate, a flow of electric energy and for releasing at the outlet at least a flow of carbonic gas and at least a flow of oxide;
the flow of oxide is configured for providing a flow of buffering substance, and a flow of alkaline substance;
the contactor is configured for receiving at the inlet the flow of carbonic gas released by the electric calciner, a flow of dosed PCC and a flow of water;
the contactor is further configured for reacting the CO2 present in the flow of carbonic gas with the flow of water and the flow of dosed PCC coming from the PCC dosing device according to the reactions:
CO2(aq)+H2O(l)custom characterH2CO3(aq)custom characterH(aq)++HCO3(aq)−and
CaCO3(s)+CO2(aq)+H2O→Ca(HCO3)2(aq)
and for releasing at the outlet at least a flow of ionic mixture and a flow of non-soluble gases;
the apparatus for pH correction is configured for receiving at the inlet at least a flow of buffering substance and the flow of ionic mixture;
the apparatus for pH correction is configured for reacting the flow of ionic mixture with the flow of buffering substance and for releasing at the outlet a flow of buffered ionic mixture;
the dosing device for the buffering substance is configured for receiving at the inlet a flow of buffering substance or a flow of hydroxide and for releasing at the outlet the predetermined flow of buffering substance to feed the apparatus for pH correction and the flow of alkaline substance to feed the absorber/precipitator;
the absorber/precipitator is configured for receiving at the inlet the flow of alkaline substance released by the dosing device for the buffering substance, a flow of atmospheric air, a flow of basic solution and for releasing a flow of lean atmospheric air and a flow of PCC suspension to feed the separator;
the separator is configured for receiving at the inlet the flow of PCC suspension and for releasing at the outlet at least a flow of PCC available to the PCC dosing device and the flow of basic solution;
the PCC dosing device is configured for receiving at the inlet the flow of PCC and for releasing:
a flow of dosed PCC available to feed the contactor;
the flow of excess PCC available for any use;
and wherein the basic solution is an aqueous solution comprising one or more of: NaOH, Na2CO3, KOH, and K2CO3.