A system and method for removing acidic gas from a post combustion process stream

A gas exchange system, said system comprising:

• at least one membrane contactor cell (MBC);
• said at least one membrane contactor cell (MBC) having a bore in which is placed a gas permeable, liquid impermeable, hollow fiber;
• each hollow fiber having a membrane inlet arranged to receive a gas from an inlet chamber and a membrane outlet for venting said gas;
• said bore is arranged to flow a lean solvent in contact with an external surface of the hollow fiber so as to permit the exchange of gas through said gas permeable, liquid impermeable membrane, and;
• a pressure differential control system, said pressure differential control system arranged to monitor a pressure of the post combustion process stream and the lean solvent;
• wherein said pressure differential control system is arranged to control the solvent and process stream and maintain a pressure differential whereby the gas pressure is greater than the lean solvent pressure.