Method And Apparatus For Removing A Target Substance From A Gas

A method for removing a target substance from a gas, the method comprising

• providing a capture medium comprising an alkaline aqueous solution for dissolving the target substance comprised in the gas to form a target ion in the capture medium,
• contacting the target substance comprised in the gas with the capture medium to form a target ion in the capture medium, and
• transporting the target ion comprised in the capture medium to a process medium via an ion transport mechanism which is operable to have the target ion move from the capture medium to the process medium in the absence of an electrical potential, wherein the process medium comprises an aqueous solution comprising an ion having an electric charge opposite to that of the target ion, and which interacts with the target ion to form a compound in the process medium, wherein the ion transport mechanism is adapted to allow a flow of ions between the capture medium and the process medium to maintain charge balance.

An apparatus for removing a target substance from a gas, the apparatus comprising:

• a capture medium comprising an alkaline aqueous solution for dissolving the target substance comprised in the gas to form a target ion in the capture medium,
• a process medium comprising an aqueous solution having an ion with an electric charge opposite to that of the target ion, and which is adapted to interact with the target ion to form a compound in the process medium, and
• an ion transport mechanism adapted to allow transport of the target ion from the capture medium to the process medium, and a flow of ions between the capture medium and the process medium to maintain charge balance, wherein the ion transport mechanism is operable to have the target ion move from the capture medium to the process medium in the absence of an electrical potential.