| abstract |
The invention provides a method for the capture of carbon dioxide gas which comprises contacting the carbon dioxide with at least one acid or a salt thereof, wherein said acid has a pKa value in the range of from 0 to 14, and said acid does not include an amino group. The at least one acid or a salt thereof may be in a solid or liquid form, but preferably comprises an aqueous solution. The acid may be inorganic or organic. Preferred acids have pKa values in the range from 4 to 13. Suitable organic acids may comprise aliphatic, carbocyclic or heterocyclic acids and mono- or poly-acids. Preferably, the acid is present as a salt. The method offers a convenient and simple 10 process which uses inexpensive consumables which are preferably largely biocompatible and renewable, and thereby offers significant advantages over the methods of the prior art. |