Carbon Dioxide → Carbon Dioxide

Participants

Reaction Steps

In still another aspect, the present invention provides a process for reducing the amount of carbon dioxide in a flue gas stream which is generated from a fossil fuel combustion system. The process includes introducing the flue gas stream and a carbonate-containing solution into an absorption column; contacting the flue gas stream with the carbonate-containing solution in the absorption column; reacting carbon dioxide in the flue gas stream with carbonate in the carbonate-containing solution to produce a carbon dioxide-, bicarbonate-, carbonate-containing solution; transferring at least a portion of heat from the carbon dioxide-, bicarbonate-, carbonate-containing solution exiting the chamber to the carbonate-containing solution such that the temperature of the chamber is from about 50° C. to about 90° C.; precipitating in a separating chamber a bicarbonate-containing solid out of the carbon dioxide-, bicarbonate-, carbonate-containing solution, wherein the separating chamber includes a carbon dioxide-, bicarbonate-, carbonate-containing solvent that has a solubility of bicarbonate in water that is less than the solubility in water of the carbon dioxide-, bicarbonate-, carbonate-containing solution in the absorption column; concentrating the bicarbonate-containing solid to form a bicarbonate-containing slurry; stripping the bicarbonate-containing slurry in a pressurized stripping column to produce a carbon dioxide product, wherein the stripping column has a pressure in the range of from 5 to 60 bar.

Provenance & Evidence